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User Manual MV1-D1312(I) Gigabit Ethernet Series

1. 4 4 1 Introductionl 4 4 2 Trigger Source 2 nr renn 4 4 3 Exposure Time Control 4 4 5 Burst Trigger available on request 4 4 6 Software Trigger 4 4 7 Strobe Output 4 6 Image Correction EEE EE ee er SERRES RES SD DRE 4 6 2 Offset Correction FPN Hot Pixels dio ae Sane we gee ae ee a EN EE a eee CONTENTS CONTENTS 4 6 4 Corrected Image 7 Digital Gain and Offset 8 Grey Level Transformation LUT 4 a 4 8 3 User defined Look up Table 4 9 Convolver 4 9 1 Functionality 9 2 Settings 9 3 Examples 4 10 Crosshairs 4 4 11 Image Information and Status Line available on request 4 11 1 Counters and Average Value ES ES 4 12 Test Images 4 12 7 Ramp a ass EA pb Ea 4 12 2 LFSRI 4 12 3 Troubleshooting using the LFSR 5 Hardware Interface 5 1 _Connectorsi 5 1 1 GigE Connector 5 1 2 Power Supply 5 1 3 Trigger and Strobe Signals for GigE Cameras 5 1 4 Status Indicator GigE cameras Mechanical and Optical Considerations 6 1 Mechanical Interface 6 1 1 Cameras with GigE Interface 6 2 Optical Interface 6 2 1 Cleaning the Sensor 6 3 Compliance
2. 6 7 Warranty 7 1 Warranty Terms 7 2 Warranty Claim 8 References A 1 Power Supply Connectorl B Revision History 10 1 Functionality La EEE aker ot on je eee 68 79 81 ETE Eee a 81 83 Preface 1 1 About Photonfocus The Swiss company Photonfocus is one of the leading specialists in the development of CMOS image sensors and corresponding industrial cameras for machine vision security amp surveillance and automotive markets Photonfocus is dedicated to making the latest generation of CMOS technology commercially available Active Pixel Sensor APS and global shutter technologies enable high speed and high dynamic range 120 dB applications while avoiding disadvantages like image lag blooming and smear Photonfocus has proven that the image quality of modern CMOS sensors is now appropriate for demanding applications Photonfocus product range is complemented by custom design solutions in the area of camera electronics and CMOS image sensors Photonfocus is ISO 9001 certified All products are produced with the latest techniques in order to ensure the highest degree of quality 1 2 Contact Photonfocus AG Bahnhofplatz 10 CH 8853 Lachen SZ Switzerland Sales Phone 41 55 451 07 45 Email sales photonfocus com Phone 41 55 451 01 37 Email support photonfocus com Table 1 1 Photonfocus Contact
3. 1 3 Sales Offices Photonfocus products are available through an extensive international distribution network and through our key account managers Details of the distributor nearest you and contacts to our key account managers can be found at www photonfocus com 1 4 Further information Photonfocus reserves the right to make changes to its products and documenta C tion without notice Photonfocus products are neither intended nor certified for use in life support systems or in other critical systems The use of Photonfocus products in such applications is prohibited Photonfocus is a trademark and LinLog is a registered trademark of Photonfo amp gt cus AG CameraLink and GigE Vision are a registered mark of the Automated Imaging Association Product and company names mentioned herein are trade marks or trade names of their respective companies 1 Preface amp gt Reproduction of this manual in whole or in part by any means is prohibited without prior permission having been obtained from Photonfocus AG amp gt Photonfocus can not be held responsible for any technical or typographical er rors 1 5 Legend In this documentation the reader s attention is drawn to the following icons CS Important note lt gt Alerts and additional information A Attention critical warning DI Notification user guide 2 How to get started GigE 1 Remove the camera from its packaging Please make sure t
4. Start pixel index Parameter width bit Parameter Description 0 32 Preamble 0x55AAOOFF 4 24 Image Counter see Section 4 11 1 8 32 Real Time Counter see Section 12 8 Missed Trigger Counter see Section 16 12 Image Average Value see Section 4 11 1 20 24 Integration Time in units of clock cycles see Table 3 3 24 16 Burst Trigger Number 28 8 Missed Burst Trigger Counter 32 11 Horizontal start position of ROI Window X 36 11 Horizontal end position of ROI Window X Window W 1 40 11 Vertical start position of ROI Window Y In MROI mode this parameter is 0 44 11 Vertical end position of ROI Window Y Window H 1 In MROI mode this parameter is the total height 1 48 2 Trigger Source 52 2 Digital Gain 56 2 Digital Offset 60 16 Camera Type Code see 4 14 64 32 Camera Serial Number Table 4 13 Assignment of status line fields Camera Model MV1 D1312 40 GB 12 220 Camera Type Code MV1 D1312 80 GB 12 221 MV1 D1312 100 GB 12 223 MV1 D13121 40 GB 12 240 MV1 D13121 80 GB 12 241 MV1 D13121 100 GB 12 243 Table 4 14 Type codes of MV1 D1312 1 GB cameras series 4 11 Image Information and Status Line available on request 67 4 Functionality 4 12 Test Images Test images are generated in the camera FPGA independent of the image sensor They can be used to check the transmission path from the camera to the frame grabber Independent from the configured grey level resolution
5. 0 fr 0 1 l 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 Grey level 12 Bit DN Figure 4 40 Proper grey reference image for gain correction 4 6 Image Correction 53 4 Functionality 4 6 4 Corrected Image Offset gain and hot pixel correction can be switched on separately The following configurations are possible No correction e Offset correction only e Offset and hot pixel correction e _ Hot pixel correction only e Offset and gain correction e Offset gain and hot pixel correction In addition the black reference image and grey reference image that are currently stored in the camera RAM can be output sa Re 4 1 Y a sl Y ER cc TENESI BBHE 21 212081 IAE 110721 ogf i 1 4 mov i lt 1 gt current image offset correction gain correction corrected image matrix matrix Figure 4 41 Schematic presentation of the corrected image using gain correction algorithm Table 4 11 shows the minimum and maximum values of the correction matrices i e the range that the offset and gain algorithm can correct Minimum Maximum Offset correction 1023 DN 12 bit 1023 DN 12 bit Gain correction 0 42 2 67 Table 4 11 Offset and gain correction ranges 54 4 7 Digital Gain and Offset Gain x1 x2 x4 and x8 are digital amplifications which means that the digital image data are multiplied in the camera module by
6. D1312I Full well capacity 0 79 fA pixel 27 C 100 ke Spectral range MV1 D1312 Spectral range MV1 D13121 350 nm 980 nm see Fig 350 nm 1100 nm see Fig 3 3 Responsivity MV1 D1312 295 x10 DN J m 670 nm 8 bit Responsivity MV1 D1312I Quantum Efficiency 305 x10 DN J m 850 nm 8 bit Optical fill factor Dynamic range 60 dB in linear mode 120 dB with LinLog Colour format Monochrome Characteristic curve Shutter mode Linear LinLog Global shutter Greyscale resolution 12 bit 10 bit 8 bit Table 3 2 General specification of the MV1 D1312 1 camera series Footnotes 1 Indicated values are typi cal values Indicated values are subject to confirmation If operated above 1000 nm the image will be unsharp 3 3 Technical Specification 15 3 Product Specification MV1 D1312 1 40 MV1 D1312 1 80 MV1 D1312 1 100 Exposure Time 10 us 1 68 5 10 ys 0 84 s 10 us 0 715 Exposure time increment 100 ns 50 ns 40 ns Frame rate Tint 10 us 27 fps 8 bit 54 fps 8 bit 67 fps 8 bit Pixel clock frequency 50 MHz Pixel clock cycle 20 ns Read out mode sequential or simultaneous Table 3 3 Model specific parameters Footnote 3 Maximum frame rate full resolution 8 bit Operating temperature MV1 D1312 1 40 MV1 D1312 1 80 MV1 D1312 1 100 0 C 50 C Camera power
7. MROI or decimation configurations Figure Fig 4 56 shows two situations of the crosshairs configuration The same MROI settings is used in both situations The crosshairs however is set differently The crosshairs is not seen in the image on the right because the x and y position is set outside the MROI region 64 0 0 MROI 0 MROI 0 Xapsotutr Yapsour Grey Level Xapsoiutr Yarsou Grey Level MROI 1 MROI 1 1311 1081 Figure 4 56 Crosshairs absolute position 4 10 Crosshairs 1311 1081 65 4 Functionality 4 11 Image Information and Status Line available on request There are camera properties available that give information about the acquired images such as an image counter average image value and the number of missed trigger signals These properties can be queried by software Alternatively a status line within the image data can be switched on that contains all the available image information 4 11 1 Counters and Average Value Image counter The image counter provides a sequential number of every image that is output After camera startup the counter counts up from 0 counter width 24 bit The counter can be reset by the camera control software Real Time counter The time counter starts at 0 after camera start and counts real time in units of 1 micro second The time counter can be
8. T T T T 250 200 150 100 y grey level output value 8 bit DN 50 l l 0 200 400 600 800 1000 1200 x grey level input value 10 bit DN Figure 4 44 Applying gamma correction to an image gamma gt 1 Grey level transformation Gamma y 255 1023 x y lt 1 300 T T T T T 250 200 150 100 y grey level output value 8 bit DN 50 1 1 0 200 400 600 800 1000 1200 x grey level input value 10 bit DN Figure 4 45 Applying gamma correction to an image gamma lt 1 4 8 Grey Level Transformation LUT 57 4 Functionality 4 8 3 User defined Look up Table In the User mode the mapping of input to output grey levels can be configured arbitrarily by the user There is an example file in the PFRemote folder LUT files can easily be generated with a standard spreadsheet tool The file has to be stored as tab delimited text file User LUT y f x 12 bit 8 bit Figure 4 46 Data path through LUT 4 8 4 Region LUT and LUT Enable Two LUTs and a Region LUT feature are available in the MV1 D1312 l camera series Both LUTs can be enabled independently see 4 12 LUT 0 superseds LUT1 When Region LUT feature is enabled then the LUTs are only active in a user defined region Examples are shown in Fig 4 47 and Fig 4 48 Fig 4 47 shows an example of overlapping Region LUTs LUT 0 LUT 1 and Region LUT are enabled LUT 0 is
9. original image right gain 4 region in the are of the date print of the bottle 60 4 9 Convolver 4 9 1 Functionality The Convolver is a discrete 2D convolution filter with a 3x3 convolution kernel The kernel coefficients can be user defined The M x N discrete 2D convolution pour x y of pixel pin xy with convolution kernel h scale s and offset o is defined in Fig 4 50 M 1N 1 1 p M 1 N 1 2 Y pim sn palx gt m y gt n Pout m 0n 0 Figure 4 50 Convolution formula 4 9 2 Settings The following settings for the parameters are available Offset Offset value o see Fig 4 50 Range 4096 4095 Scale Scaling divisor s see Fig 4 50 Range 1 4095 Coefficients Coefficients of convolution kernel h see Fig 4 50 Range 4096 4095 Assignment to coefficient properties is shown in Fig Coeff0 Coeffl Coeff2 Coeff3 Coeff4 Coeff3 Coeff Coeff7 Coeffs Figure 4 51 Convolution coefficients assignment 4 9 3 Examples Fig 4 52 shows the result of the application of various standard convolver settings to the original image shows the corresponding settings for every filter A filter called Unsharp Mask is often used to enhance near infrared images Fig 4 54 shows examples with the corresponding settings 4 9 Convolver 61 4 Functionality Laplace 1 Figure 4 52 3x3 Convolution filter examples 1 Sobel H Offset 0 Scale 1 Laplace 1 Offset
10. ratio of readout time over frame time LED Red Red indicates an active serial communication with the camera Table 5 1 Meaning ofthe LED of the GigE CMOS cameras 72 Mechanical and Optical Considerations 6 1 Mechanical Interface During storage and transport the camera should be protected against vibration shock moisture and dust The original packaging protects the camera adequately from vibration and shock during storage and transport Please either retain this packaging for possible later use or dispose of it according to local regulations 6 1 1 Cameras with GigE Interface Fig 6 1 shows the mechanical drawing of the camera housing for the MV1 D1312 1 CMOS cameras with GigE interface Note that the depth of the camera housing is given without the C Mount adapter which will add up 5 mm to the housing depth of 94 mm photon ns o Figure 6 1 Mechanical dimensions of the GigE camera displayed without C Mount adapter 73 6 Mechanical and Optical Considerations 6 2 Optical Interface 6 2 1 Cleaning the Sensor The sensor is part of the optical path and should be handled like other optical components with extreme care Dust can obscure pixels producing dark patches in the images captured Dust is most visible when the illumination is collimated Dark patches caused by dust or dirt shift position as the angle of illumination changes Dust is n
11. reset by the software in the SDK Counter width 32 bit Missed trigger counter The missed trigger counter counts trigger pulses that were ignored by the camera because they occurred within the exposure or read out time of an image In free running mode it counts all incoming external triggers counter width 8 bit no wrap around Missed burst trigger counter The missed burst trigger counter counts trigger pulses that were ignored by the camera in the burst trigger mode because they occurred while the camera still was processing the current burst trigger sequence Average image value The average image value gives the average of an image in 12 bit format 0 4095 DN regardless of the currently used grey level resolution 4 11 2 Status Line If enabled the status line replaces the last row of the image with camera status information Every parameter is coded into fields of 4 pixels LSB first and uses the lower 8 bits of the pixel value so that the total size of a parameter field is 32 bit see Fig 14 57 The assignment of the parameters to the fields is listed in 4 13 The status line is available in all camera modes MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB Pixel 15 16 17 19 110111 12 113 114 115 16 117 118 119 20 21 122 123 FF 00 AA 55 Preamble Field 0 Field 1 Field 2 Field 3 Field 4 Figure 4 57 Status line parameters replace the last row of the image 66
12. resolution of 1312 x 1082 pixels at a wide range of spectral sensitivity It is aimed at standard applications in industrial image processing The principal advantages are e Resolution of 1312 x 1082 pixels e Wide spectral sensitivity from 320 nm to 1030 nm Enhanced near infrared NIR sensitivity with the A13121 CMOS image sensor e High quantum efficiency gt 50 High pixel fill factor gt 60 Superior signal to noise ratio SNR Low power consumption at high speeds e Very high resistance to blooming High dynamic range of up to 120 dB Ideal for high speed applications Global shutter e Greyscale resolution of up to 12 bit e On camera shading correction e 3x3 Convolver for image pre processing included on camera available on request Up to 512 regions of interest MROI available on request 2 look up tables 12 to 8 bit on user defined image region Region LUT available on request Crosshairs overlay on the image e available on request Image information and camera settings inside the image status line e Software provided for setting and storage of camera parameters e The camera has a Gigabit Ethernet interface e The compact size of TBC mm makes the MV1 D1312 1 CMOS cameras the perfect solution for applications in which space is at a premium The general specification and features of the camera are listed in the following sections 13 3 Product Specifi
13. supply 12 V DC 10 Trigger signal input range Max power consumption lt 45W 5 15 V DC lt 5 0W lt 5 2W Lens mount C Mount CS Mount optional Dimensions Mass 60 x 60 x 94 mm 480 g Conformity CE RoHS WEE Table 3 4 Physical characteristics and operating ranges of the MV1 D1312 I CMOS camera series 16 Fig 3 2 shows the quantum efficiency and the responsivity of the A1312 CMOS sensor displayed as a function of wavelength For more information on photometric and radiometric measurements see the Photonfocus application notes AN006 and ANO008 available in the support area of our website www photonfocus com 60 QE Responsivity 1200 50 1000 40 800 30 600 Quantum Efficiency 20 Responsivity V J m2 400 10 1 200 0 i 200 300 400 500 600 700 800 900 1000 1100 Wavelength nm Figure 3 2 Spectral response of the A1312 CMOS image sensor standard in the MV1 D1312 camera series 3 3 Technical Specification 17 3 Product Specification Fig 3 3 shows the quantum efficiency and the responsivity of the A13121 CMOS sensor displayed as a function of wavelength The enhancement in the NIR quantum efficiency could be used to realize applications in the 900 to 1064 nm region 60 Responsivity 1200 50 1000 40 800 30 600 Quantum Efficiency Res
14. together with ROI or MROI Decimation in y direction transfers every n row only and directly results in reduced read out time and higher frame rate respectively Fig shows decimation on the full image The rows that will be read out are marked by red lines Row 0 is read out and then every nt row 0 0 1311 1081 Figure 4 25 Decimation in full image Fig shows decimation on a ROI The row specified by the Window setting is first read out and then every nt row until the end of the ROI 0 0 i 1311 1081 Figure 4 26 Decimation and ROI Fig shows decimation and MROI For every MROI region m the first row read out is the row specified by the MROI lt m gt Y setting and then every nt row until the end of MROI region m 38 0 0 ROI 1311 1081 Figure 4 27 Decimation and MROI The image in Fig on the right hand side shows the result of decimation 3 of the image on the left hand side Figure 4 28 Image example of decimation 3 An example of a high speed measurement of the elongation of an injection needle is given in Fig In this application the height information is less important than the width information Applying decimation 2 on the original image on the left hand side doubles the resulting frame to about 7800 fps 4 3 Reduction of Image Size 39 4 Functionality Figure 4 29 Example of decimation 2 on ima
15. 0 Scale 1 1 Blur Offset 0 Scale 9 Sobel V Offset 0 Scale 1 10 1 2 0 72 1 0 1 Laplace 2 Offset 128 Scale 1 1 1 1 8 1 1 Gaussian Blur Offset 0 Scale 16 Sobel Diagonal 1 Offset 0 Scale 1 2 1 1 0 NE Prewitt H Offset 0 Scale 1 Figure 4 53 3x3 Convolution filter examples 1 settings 62 a Prewitt H Prewitt V Sharpen Offset 0 Scale 1 1 Sobel Diagonal 2 Offset 0 Scale 1 Prewitt V Offset 0 Scale 1 1 0 1 1 0 1 1 0 1 Original image Unsharp mask Unsharp mask with Gaussian Offset 0 Offset 0 Scale 1 Scale 6 1 1 1 1 4 1 1 9 1 4 26 4 1 1 1 1 4 1 Figure 4 54 Unsharp Mask Examples 4 9 Convolver 63 4 Functionality 4 10 Crosshairs 4 10 1 Functionality The crosshairs inserts a vertical and horizontal line into the image The width of these lines is one pixel The grey level is defined by a 12 bit value 0 means black 4095 means white This allows to set any grey level to get the maximum contrast depending on the acquired image The x y position and the grey level can be set via the camera software Figure Fig 4 55 shows two examples of the activated crosshairs with different grey values One with white lines and the other with black lines Figure 4 55 Crosshairs Example with different grey values The x and y positon is absolute to the sensor pixel matrix It is independent on the ROI
16. 1 D1312 l camera series can handle up to 512 different regions of interest This feature can be used to reduce the image data and increase the frame rate An application example for using multiple regions of interest MROI is a laser triangulation system with several laser lines The multiple ROIs are joined together and form a single image which is transferred to the frame grabber An individual MROI region is defined by its starting value in y direction and its height The starting value in horizontal direction and the width is the same for all MROI regions and is 34 Exposure time MV1 D1312 1 40 MV1 D1312 1 80 MV1 D1312 1 100 10 us 27 27 fps 54 54 fps 67 67 fps 100 ys 27 27 fps 54 54 fps 67 67 fps 500 us 27 27 fps 53 54 fps 65 67 fps 1 ms 27 27 fps 51 54 fps 63 67 fps 2 ms 26 27 fps 49 54 fps 60 67 fps 5 ms 24 27 fps 42 54 fps 50 67 fps 10 ms 22 27 fps 35 54 fps 40 67 fps 12 ms 21 27 fps 33 54 fps 37 67 fps Table 4 7 Frame rates of different exposure times sequential readout mode simultaneous readout mode resolution 1312 x 1082 pixel correction on defined by the ROI settings The maximum frame rate in MROI mode depends on the number of rows and columns being read out Overlapping ROls are allowed See Section 4 3 3 for information on the calculation of the maximum frame rate Fig 4 22 compares ROI and MROI the setups visualized on the image sensor area ar
17. 2 1 100 Timing Parameter Minimum Maximum Ta_iso input 45 ns 60 ns tiitter 0 40 ns tirigger delay 0 0 715 tburst trigger delay 0 0 715 thurst period time depends on camera settings 0 715 ttrigger offset NON burst mode 100 ns 160 ns tirigger offset Durst mode 125 ns 200 ns texposure 10 us 0 715 tstrobe delay 0 0 715 tstrobe offset NON burst mode 100 ns 160 ns tstrobe offset Durst mode 125 ns 200 ns tstrobe duration 200 ns 0 715 ta iso output 45 ns 60 ns tirigger pulsewidth 200 ns n a Number of bursts n 1 30000 Table 4 10 Summary of timing parameters relevant in the external trigger mode using camera MVT1 D1312 1 100 4 4 Trigger and Strobe 47 4 Functionality 4 4 6 Software Trigger The software trigger enables to emulate an external trigger pulse by the camera software through the serial data interface It works with both burst mode enabled and disabled As soon as it is performed via the camera software it will start the image acquisition s depending on the usage of the burst mode and the burst configuration The trigger mode must be set to Interface Trigger or 1 0 Trigger 4 4 7 Strobe Output The strobe output is an opto isolated output located on the power supply connector that can be used to trigger a strobe The strobe output can be used both in free running and in trigger mode There is a programmable delay available to adjust the strobe pulse to your application The str
18. 50 Value1 19 Value2 18 300 T T T T T 250 T2 950 T2 960 T2 970 T2 980 3 200 I T2 990 150 a gt u D 5 100 O 5 O 50 7 0 i Illumination Intensity Figure 4 17 Response curve for different LinLog settings in LinLog3 mode 4 2 Pixel Response 29 4 Functionality 4 3 Reduction of Image Size With Photonfocus cameras there are several possibilities to focus on the interesting parts of an image thus reducing the data rate and increasing the frame rate The most commonly used feature is Region of Interest ROI 4 3 1 Region of Interest ROI Some applications do not need full image resolution e g 1312 x 1082 pixels By reducing the image size to a certain region of interest ROI the frame rate can be drastically increased A region of interest can be almost any rectangular window and is specified by its position within the full frame and its width W and height H Fig Fig 4 19 and Fig 4 20 show possible configurations for the region of interest and Table presents numerical examples of how the frame rate can be increased by reducing the ROI CS Both reductions in x and y direction result in a higher frame rate The minimum width of the region of interest depends on the model of the MV1 D1312 l camera series For more details please consult Table 4 4and Table 4 5 The minimum width must be positioned symmetrically towards the vertical cen
19. URE GEV Player GEVPlayer DER Eile Tools Help Connection Display Disconnect IP address MAC address Manufacturer Model Name Acquisition Control Mode Channel gt Play Parameters and Controls Communication control GEV Device control Image stream control 1130 images 35 4FPS 401 6 Mbps Figure 2 10 GEV Player displaying live image stream 15 Check the status LED on the rear of the camera EIN The status LED lights green when an image is being produced and it is red when serial communication is active For more information see Section 16 To configure the camera use the GEV device control tool selecting the visibility modus Beginner GEV Device Control El 5 Visibilty Beginner DeviceInformation DeviceModelName DeviceManufacturerInfo DeviceVersion DeviceUserID ImageSizeControl Width Height PixelFormat Offsetx 0 Offsety 0 AcquisitionAndTriggerControls AcquisitionMode Continuous AcquisitionStart Command SelectedNodeName his is where the description of the node will be written This static item will also contain extra information depending on the node type like increment For integers or things like that Figure 2 11 Control settings on the camera 12 Product Specification 3 1 Introduction The MV1 D1312 1 CMOS camera series is built around the monochrome A1312 1 CMOS image sensor from Photonfocus that provides a
20. a factor 1 2 4 or 8 respectively It is implemented as a binary shift of the image data which means that there will be missing codes in the output image as the LSB s of the gray values are set to 0 E g for gain x2 the output value is shifted by 1 and bit 0 is set to 0 A user defined value can be subtracted from the gray value in the digital offset block This feature is not available in Gain x1 mode If digital gain is applied and if the brightness of the image is too big then the output image might be saturated By subtracting an offset from the input of the gain block it is possible to avoid the saturation 4 8 Grey Level Transformation LUT Grey level transformation is remapping of the grey level values of an input image to new values The look up table LUT is used to convert the greyscale value of each pixel in an image into another grey value It is typically used to implement a transfer curve for contrast expansion The camera performs a 12 to 8 bit mapping so that 4096 input grey levels can be mapped to 256 output grey levels The use of the three available modes is explained in the next sections Two LUT and a Region LUT feature are available in the MV1 D1312 camera series see Section 4 8 4 amp gt The output grey level resolution of the look up table independent of gain gamma or user definded mode is always 8 bit CS There are 2 predefined functions which generate a look up table and transfer it to the came
21. able a fine tuning of the slope in the logarithmic region LinLog exp Value1 Value2 EEE VE 0 Time1 Time2 max t 1000 Figure 4 13 Voltage switching in the Linlog2 mode Typical LinLog2 Response Curve Varying Parameter Time Time2 1000 Value1 19 Value2 14 300 T T1 840 7 Ti 920 T1 960 250 200 T1 980 T1 999 150 100 Output grey level 8 bit DN 50 Illumination Intensity Figure 4 14 Response curve for different LinLog settings in LinLog2 mode 4 2 Pixel Response 27 4 Functionality Typical LinLog2 Response Curve Varying Parameter Time1 Time2 1000 Value1 19 Value2 18 200 T T T T 180 1604 Z 2 140 4 5 120 S 100 717880 J a Ti 900 T1 920 80F Ti 940 7 5 Ti 960 2 60 Ti 980 4 5 T1 1000 O 40 Ben EG EA EI A EA ES AA TS BAAD Fe ee ee 20 Lodi ERE EEEE EE E E EN ER RR US 0 Illumination Intensity Figure 4 15 Response curve for different LinLog settings in LinLog2 mode LinLog3 To enable more flexibility the LinLog3 mode with 4 parameters was introduced Fig 4 16 shows the timing diagram for the LinLog3 mode and the control parameters V LinLog Value1 Value2 Value3 Constant 0 Time1 Time2 tap Figure 4 16 Voltage switching in the LinLog3 mode 28 Typical LinLog2 Response Curve Varying Parameter Time2 Time1 8
22. active in region 0 x00 x01 y00 y01 and it supersedes LUT 1 in the overlapping region LUT 1 is active in region 1 x10 x11 y10 y11 Fig 4 48 shows an example of keyhole inspection in a laser welding application LUT 0 and LUT 1 are used to enhance the contrast by applying optimized transfer curves to the individual regions LUT 0 is used for keyhole inspection LUT 1 is optimized for seam finding Fig 4 49 shows the application of the Region LUT to a camera image The original image without image processing is shown on the left hand side The result of the application of the Region LUT is shown on the right hand side One Region LUT was applied on a small region on the lower part of the image where the brightness has been increased Enable LUT 0 Enable LUT 1 Enable Region LUT Description LUT are disabled X don t care LUT 0 is active on whole image X LUT 1 is active on whole image X X LUT 0 active in Region 0 X X X LUT 0 active in Region 0 and LUT 1 active in Region 1 LUT 0 supersedes LUT1 Table 4 12 LUT Enable and Region LUT 58 0 0 x00 x10 x01 x11 y01 yii 1311 1081 Figure 4 47 Overlapping Region LUT example 1311 1081 1311 1081 Figure 4 48 Region LUT in keyhole inspection 4 8 Grey Level Transformation LUT 59 4 Functionality Figure 4 49 Region LUT example with camera image left
23. ality of the grey reference image is crucial for proper gain correction 52 1 1 U 1 E uv average 11 21010 09 1 110 nr 2 1 1 12120831 picture 210 al Ku 1 gt 1 gray reference offset correction gain correction picture matrix matrix Figure 4 39 Schematic presentation of the gain correction algorithm Gain correction always needs an offset correction matrix Thus the offset correc tion always has to be performed before the gain correction How to Obtain a Grey Reference Image In order to improve the image quality the grey reference image must meet certain demands e The grey reference image must be obtained at uniform illumination Use a high quality light source that delivers uniform illumination Standard illu mination will not be appropriate e When looking at the histogram of the grey reference image ideally there are no grey levels at full scale 4095 DN 12 bit All pixels that are saturated white will not be properly corrected see Fig 4 40 e Camera settings may influence the grey level Therefore the camera settings of the grey reference image must be identical with the camera settings of the image to be corrected Histogram of the uncorrected grey reference image 1 T T T T T T T EN T T grey reference image ok AT 2 0 8 grey reference image too bright v 4 x 5 06 4 o E 5 04 a o 2 0 2 7
24. an be configured to be active high or active low When the frequency of the incoming burst triggers is higher than the duration of the programmed burst sequence then some trigger pulses will be missed A missed burst trigger counter counts these events This counter can be read out by the user external trigger pulse input trigger after isolator t d iso input trigger pulse internal camera control titter delayed trigger for burst trigger engine e tj urst trigger d lay delayed trigger for shutter control t burst period time t trigger delay internal shutter control cr trigger offset t exposure l l delayed trigger for strobe control t strobe delay internal strobe control tstrobe offset t strobe duration external strobe pulse output gt ET Figure 4 34 Timing diagram for the burst trigger mode The timing diagram of the burst trigger mode is shown in Fig The timing of the external trigger pulse input until to the trigger pulse internal camera control is equal to the timing in the section Fig This trigger pulse then starts after a user configurable burst trigger delay time tpurst trigger delay the internal burst engine which generates n internal triggers for the shutter and the strobe control A user configurable value defines the time thurst period time between two acquisitions 4 4 Trigger and Strobe 45 4 Functionalit
25. at you apply the appropriate voltages to your camera Incorrect voltages will damage the camera For further details including the pinout please refer to Appendix A 71 5 Hardware Interface 5 1 3 Trigger and Strobe Signals for GigE Cameras The power connector contains an external trigger input and a strobe output The trigger input is equipped with a constant current diode which limits the current of the optocoupler over a wide range of voltages Trigger signals can AN thus directly get connected with the input pin and there is no need for a current limiting resistor that depends with its value on the input voltage The input voltage to the TRIGGER pin must not exceed 15V DC to avoid damage to the internal ESD protection and the optocoupler In order to use the strobe output the internal optocoupler must be powered with 5 15 V DC The STROBE signal is an OP Amp s output The range of the output signal can be adjusted by the STROBE VDD ISO_VDD Input TRIGGER IE a Isolator STROBE VDD STROBE SGND Figure 5 2 Circuit for the trigger input signals 5 1 4 Status Indicator GigE cameras A dual color LED on the back of the camera gives information about the current status of the GigE CMOS cameras LED Green Green when an image is output At slow frame rates the LED blinks with the FVAL signal At high frame rates the LED changes to an apparently continuous green light with intensity proportional to the
26. be pulse output gt Lost Figure 4 33 Timing diagram for the Pulsewidth controlled exposure time The timing of the rising edge of the trigger pulse until to the start of exposure and strobe is equal to the timing of the camera controlled exposure time see Section 4 4 3 In this mode however the end of the exposure is controlled by the falling edge of the trigger Pulsewidth The falling edge of the trigger pulse is delayed by the time t4_iso input Which is results from the signal isolator This signal is clocked into the FPGA which leads to a jitter of titter The pulse is then delayed by tirigger delay by the user defined value which can be configured via camera software After the trigger offset time tirigger offset the exposure is stopped 44 4 4 4 Trigger Delay not available in MV1 D1312 1 80 The trigger delay is a programmable delay in milliseconds between the incoming trigger edge and the start of the exposure This feature may be required to synchronize to external strobe with the exposure of the camera 4 4 5 Burst Trigger available on request The camera includes a burst trigger engine When enabled it starts a predefined number of acquisitions after one single trigger pulse The time between two acquisitions and the number of acquisitions can be configured by a user defined value via the camera software The burst trigger feature works only in the mode Camera controlled Exposure Time The burst trigger signal c
27. bnet Mask 253 255 Default Gateway Default Gateway GigE Vision Device Information 00 11 1c 00 65 3d IP 169 254 245 176 Subnet Mask 255 255 0 0 Default Gateway 0 0 0 0 IP Address L vendor Photonfocus AG Model MV1 D1312 80 GB 12 SERIES Access Status Unknown Default Gateway 3 A Manufacturer Info Photonfocus AG 00140622 Version Version 0 1 02 01 12 Serial Number User Defined Name Protocol Version IP Configuration License GigE Vision Device IP Configuration MAC Address Show unreachable GigE Vision Devices Set IP Address Figure 2 7 Completing the GEV Device Selection Procedure 10 12 Finish the configuration process and connect the camera to eBus PURE GEV Player GEVPlayer File Tools Help Connection Select Connect Disconnect IP address 192 168 5 5 MAC address 00 11 1c 00 65 3d Manufacturer Photonfocus AG 00140622 Model MV1 D1312 80 GB 12 Name Acquisition Control Mode Continuous vi Channel Data Channel 0 gt a Play Stop Parameters and Controls Lo Evneveconra Image stream control Figure 2 8 GEV Player is readily configured 13 GEV Player starts opening the eBUS stream to the camera Connection Progress Opening eBUS stream to device Figure 2 9 GEV Player starting eBUS stream 2 How to get started GigE 14 You may display images using the eBUS P
28. cation 3 2 Feature Overview Characteristics MV1 D1312 I Series Interface Gigabit Ethernet Trigger Modes Interface Trigger External opto isolated trigger input Features Region of Interest ROI Test pattern LFSR and grey level ramp Shading Correction Offset and Gain 3x3 Convolver included on camera High blooming resistance isolated trigger input and opto isolated strobe output Available on request 2 look up tables 12 to 8 bit on user defined image region Region LUT Up to 512 regions of interest MROI Image information and camera settings inside the image status line Crosshairs overlay on the image Table 3 1 Feature overview see Chapter 4 for more information Figure 3 1 MV1 D1312 1 CMOS camera with C mount lens 14 3 3 Technical Specification Technical Parameters Technology Scanning system MV1 D1312 1 Series CMOS active pixel APS Progressive scan Optical format diagonal 1 13 6 mm diagonal maximum resolution Resolution 2 3 11 6 mm diagonal 1024 x 1024 resolution 1312 x 1082 pixels Pixel size Active optical area 8 um X 8 um 10 48 mm x 8 64 mm maximum Random noise lt 0 3 DN 8 bit Fixed pattern noise FPN Fixed pattern noise FPN 3 4 DN 8 bit correction OFF lt 1DN 8 bit correction ON 12 Dark current MV1 D1312 0 65 fA pixel 27 C Dark current MV1
29. d 169 254 245 176 GigE Yision Device Information Figure 2 5 GEV Device Selection Procedure displaying the selected camera MV1 D1312 1 GB 2 How to get started GigE 10 Select camera model to configure IP address GEV Device Selection 4 Refreshing Interface Information a System Description Intel R PRO 1000 GT Desktop Adap EB Network Interface 00 16 76 d7 10 11 192 168 1 156 MAC 00 1b 21 07 ac 88 E l eBUS Interface 00 1b 21 07 ac 8e 192 168 5 1 IP Address 192 168 5 1 er m meee Subnet Mask 255 255 255 0 Default Gateway GigE Vision Device Information 00 11 1c 00 65 3d IP 169 254 245 176 Subnet Mask 255 255 0 0 Default Gateway 0 0 0 0 vendor Photonfocus AG Model MV1 D1312 80 GB 12 Access Status Unknown Manufacturer Info Photonfocus 4G 00140622 Version Version 0 1 02 01 12 Serial Number User Defined Name Protocol Version IP Configuration License V Show unreachable GigE Vision Devices Set IP Addres Figure 2 6 GEV Device Selection Procedure displaying GigE Vision Device Information 11 Select a valid IP address for selected camera e g 192 168 5 4 Set IP Address NIC Configuration Interface Information MAC Address 00 1b 21 07 ac 8e Description Intel R PRO 1000 GT Desktop Adap AAA Re MAC 00 1b 21 07 ac 8e IP Address 192 168 5 1 IP Address 192 168 5 1 59 254 245 176 Subnet Mask 255 255 255 0 Su
30. e displayed in the upper half of the drawing The lower half shows the dimensions of the resulting image On the left hand side an example of ROI is shown and on the right hand side an example of MROI It can be readily seen that resulting image with MROI is smaller than the resulting image with ROI only and the former will result in an increase in image frame rate Fig shows another MROI drawing illustrating the effect of MROI on the image content Fig alone an example from hyperspectral imaging where the presence of spectral lines at known regions need to be inspected By using MROI only a 656x54 region need to be readout and a frame rate of 4300 fps can be achieved Without using MROI the resulting frame rate would be 216 fps for a 656x1082 ROI 4 3 Reduction of Image Size 35 4 Functionality 0 0 0 0 MROI 0 MROI 1 MROI 2 1311 1081 1311 1081 MROI 0 MROI 1 MROI 2 Figure 4 22 Multiple Regions of Interest Figure 4 23 Multiple Regions of Interest with 5 ROIs 36 0 0 a 656 pixel Chemical Agent A B Figure 4 24 Multiple Regions of Interest in hyperspectral imaging 4 3 Reduction of Image Size C 1 pixel 2 pixel 1 pixel 20 pixel 2 pixel 26 pixel 2 pixel 1311 1081 37 4 Functionality 4 3 5 Decimation Decimation reduces the number of pixels in y direction Decimation can also be used
31. e power plug For the connector assembly see Fig The pinout of the connector is shown in Appendix A Check the correct supply voltage and polarity Do not exceed the maximum operating voltage of 12V DC 10 Connect the power supply to the camera see Fig 2 2 7 Download the latest driver installation tool from the Photonfocus server and start the installation process of the eBus PureGEV package eBUS Driver Installation Tool Eile Help Network Adapter MAC Description Current Driver Action 00 16 76 d7 10 11 Intel R 82566DC Gigabit Network Connect Manufacturer Driver Do Nothing 00 1b 21 07 ac 8e Intel R PRO 1000 GT Desktop Adapter 4 eBUS Universal Driver Do Nothing Install Figure 2 3 eBUS Driver Installation Tool 8 The eBus PureGEV Player displays available Ethernet interfaces GEV Device Selection Available GigE Yision Devices Interface Information a System 1 BY Network Interface 00 16 76 d7 10 11 192 168 1 156 A eBUS Interface 00 1b 21 07 ac 8e 192 168 5 1 GigE Yision Device Information Set IP Address OK Cancel Figure 2 4 GEV Player Device Selection 9 Camera is detected Tip Select unreachable GigE Vision Devices GEV Device Selection 4 Refreshing Interface Information B System E Network Interface 00 16 76 d7 10 11 192 168 1 156 S e eBUS Interface 00 1b 21 07 ac 8e 192 168 5 1 585 MV1 D1312 80 GB 12 00 11 1c 00 65 3
32. er black reference image for offset correction Hot pixel correction Every pixel that exceeds a certain threshold in the black reference image is marked as a hot pixel If the hot pixel correction is switched on the camera replaces the value of a hot pixel by an average of its neighbour pixels see Fig 4 6 Image Correction 51 4 Functionality vv hot JR D Past Pr pixel 2 Pn 1 Pa Pr Figure 4 38 Hot pixel interpolation 4 6 3 Gain Correction The gain correction is based on a grey reference image which is taken at uniform illumination to give an image with a mid grey level Gain correction is not a trivial feature The quality of the grey reference image is crucial for proper gain correction Gain correction algorithm After configuring the camera with a black and grey reference image the camera is ready to apply the gain correction Determine the average value of the grey reference image Subtract the offset correction matrix from the grey reference image Divide the average value by the offset corrected grey reference image Pixels that have a grey level higher than a certain threshold are marked as hot pixels Store the result in the camera as the gain correction matrix On Sw D During image acquisition multiply the gain correction matrix from the offset corrected acquired image and interpolate the hot pixels see Section Gain correction is not a trivial feature The qu
33. er pulse internal camera control le bitter l delayed trigger for shutter control t trigger delay internal shutter control trigger offset Cire A ES delayed trigger for strobe control t strobe delay internal strobe control tstro be offset t strobe duration c _ external strobe pulse output gt A Figure 4 32 Timing diagram for the camera controlled exposure time The rising edge of the trigger signal is detected in the camera control electronic which is implemented in an FPGA Before the trigger signal reaches the FPGA it is isolated from the camera environment to allow robust integration of the camera into the vision system In the signal isolator the trigger signal is delayed by time ta_iso input This signal is clocked into the FPGA which leads to a jitter of titter The pulse can be delayed by the time tiger delay Which can be configured by a user defined value via camera software The trigger offset delay tirigger offset results then from the synchronous design of the FPGA state machines The exposure time texposure Is controlled with an internal exposure time controller The trigger pulse from the internal camera control starts also the strobe control state machines The strobe can be delayed by tstrobe delay With an internal counter which can be controlled by the customer via software settings The strobe offset delay tstrobe delay results then from the s
34. every possible grey level appears the same number of times in a test image Therefore the histogram of the received image must be flat SD A test image is a useful tool to find data transmission errors that are caused most often by a defective cable between camera and frame grabber The analysis of the test images with a histogram tool gives the correct result at full resolution only 4 12 1 Ramp Depending on the configured grey level resolution the ramp test image outputs a constant pattern with increasing grey level from the left to the right side see Fig Figure 4 58 Ramp test images 8 bit output left 10 bit output middle 12 right 4 12 2 LFSR The LFSR linear feedback shift register test image outputs a constant pattern with a pseudo random grey level sequence containing every possible grey level that is repeated for every row The LFSR test pattern was chosen because it leads to a very high data toggling rate which stresses the interface electronic and the cable connection In the histogram you can see that the number of pixels of all grey values are the same Please refer to application note ANO26 for the calculation and the values of the LFSR test image 4 12 3 Troubleshooting using the LFSR To control the quality of your complete imaging system enable the LFSR mode and check the histogram at 1024x1024 resolution If your frame grabber application does not provide a real time histogram store the image and u
35. ge of injection needle 40 4 4 Trigger and Strobe 4 4 1 Introduction The start of the exposure of the camera s image sensor is controlled by the trigger The trigger can either be generated internally by the camera free running trigger mode or by an external device external trigger mode This section refers to the external trigger mode if not otherwise specified In external trigger mode the trigger can be applied through the CameraLink interface interface trigger or directly by the power supply connector of the camera I O Trigger see Section 4 4 2 The trigger signal can be configured to be active high or active low When the frequency of the incoming triggers is higher than the maximal frame rate of the current camera settings then some trigger pulses will be missed A missed trigger counter counts these events This counter can be read out by the user The exposure time in external trigger mode can be defined by the setting of the exposure time register camera controlled exposure mode or by the width of the incoming trigger pulse trigger controlled exposure mode see Section 4 4 3 An external trigger pulse starts the exposure of one image In Burst Trigger Mode however a trigger pulse starts the exposure of a user defined number of images see Section 4 4 5 The start of the exposure is shortly after the active edge of the incoming trigger An additional trigger delay can be applied that delays the start of the expo
36. he following items are included with your camera e Power supply connector 7 pole power plug e Camera body cap If any items are missing or damaged please contact your dealership 2 Remove the camera body cap from the camera and mount a suitable lens When removing the camera body cap or when changing the lens the camera should always be held with the opening facing downwards to prevent dust or debris falling onto the CMOS sensor Figure 2 1 Camera with protective cap and lens Er er Do not touch the sensor surface Protect the image sensor from particles and dirt The sensor has no cover glass therefore dust on the sensor surface may resemble to clusters or extended regions of dead pixel To choose a lens see the Lens Finder in the Support area at www photonfocus com 3 To ensure maximum performance of the GigE camera it is mandatory to have an interface card with the Intel PRO 1000 PT installed in your PC er Download the lastest driver installation tool from the Photonfocus server 2 How to get started GigE A Do not apply Coyote software to configure the camera 4 Connect the camera to the GigE interface of your PC Ethernet Jack R345 Status LED Power Supply and I O Connector Figure 2 2 Rear view of the GigE camera MV1 D1312 1 40 GB with power supply and I O connector Eth ernet jack RJ45 and status LED 5 Connect a suitable power supply to the provided 7 pol
37. ive high period One LVAL lasts 640 pixel clock cycles DVAL Data Valid Is high while data are valid DATA Transferred pixel values Example For a 100x100 pixel image there are 100 values transferred within one LVAL active high period or 100 100 values within one FVAL period Line pause Delay before the first line and after every following line when reading out the image data Table 4 2 Explanation of contro and data signals used in the timing diagram These terms will be used also in the timing diagrams of Section 4 4 4 1 3 Exposure Control The exposure time defines the period during which the image sensor integrates the incoming light Refer to Table 3 3 for the allowed exposure time range 4 1 4 Maximum Frame Rate The maximum frame rate depends on the exposure time and the size of the image see Section a3 24 4 2 Pixel Response 4 2 1 Linear Response The camera offers a linear response between input light signal and output grey level This can be modified by the use of LinLog as described in the following sections In addition a linear digital gain may be applied as follows Please see Table 3 2 for more model dependent information Black Level Adjustment The black level is the average image value at no light intensity It can be adjusted by the software by changing the black level offset Thus the overall image gets brighter or darker Use a histogram to control the setti
38. le Free running mode in the sequential readout mode Exposure time of the next image can only start if the readout time of the current image is finished exposure read out exposure read out Figure 4 2 Timing in free running sequential readout mode When the acquisition of an image needs to be synchronised to an external event an external trigger can be used refer to Section 4 4 In this mode the camera is idle until it gets a signal to capture an image exposure read out idle exposure external trigger Figure 4 3 Timing in triggered sequential readout mode Simultaneous readout interleave exposure To achieve highest possible frame rates the camera must be set to Free running mode with simultaneous readout The camera continuously delivers images as fast as possible Exposure time of the next image can start during the readout time of the current image exposure n idle exposure n 1 idle read out n 1 read out n read out n 1 frame time Figure 4 4 Timing in free running simultaneous readout mode readout time gt exposure time 20 exposure n 1 exposure n exposure n 1 idle read out n 1 idle read out n frame time Figure 4 5 Timing in free running simultaneous readout mode readout time lt exposure time When the acquisition of an image needs to be synchronised to an external event an external trigger can be used refer to Section 4 4 I
39. m to the specifications set forth in the applicable documentation published by the manufacturer and accompanying said product and e the product shall be free from defects in materials and workmanship under normal use The distributor shall not make or pass on to any party any warranty or representation on behalf of the manufacturer other than or inconsistent with the above limited warranty set 7 2 Warranty Claim The above warranty does not apply to any product that has been modified or al A tered by any party other than manufacturer or for any defects caused by any use of the product in a manner for which it was not designed or by the negligence of any party other than manufacturer 77 7 Warranty 78 8 References All referenced documents can be downloaded from our website at www photonfocus com AN001 Application Note LinLog Photonfocus December 2002 AN006 Application Note Quantum Efficiency Photonfocus February 2004 AN007 Application Note Camera Acquisition Modes Photonfocus March 2004 ANO08 Application Note Photometry versus Radiometry Photonfocus December 2004 AN026 Application Note LFSR Test Images Photonfocus September 2005 ANO030 Application Note LinLog Parameter Optimization Strategies February 2009 79 8 References 80 A Pinouts A 1 Power Supply Connector The power supply plugs are available from Binder connectors at www binder connector de Fig A 2 shows the powe
40. meraLink cables contain wire pairs which are twisted in such a way that the SD cable impedance matches with the LVDS driver and receiver impedance Excess stress on the cable results in transmission errors which causes distorted images Therefore please do not stretch and bend a CameraLink cable In robots applications the stress that is applied to the CameraLink cable is especially high due to the fast movement of the robot arm For such applications special drag chain capable cables are available Please contact the Photonfocus Support for consulting expertise Appropriate CameraLink cable solutions are available from Photonfocus 70 Hardware Interface 5 1 Connectors 5 1 1 GigE Connector The GigE cameras are interfaced to external components via e an Ethernet jack RJ45 to transmit configuration image data and trigger e asubminiature connector for the power supply 8 pin or 7 pin Binder series 712 The connectors are located on the back of the camera Fig 5 1 shows the plugs and the status LED which indicates camera operation Ethernet Jack RJ45 Status LED Power Supply and I O Connector Figure 5 1 Rear view of the GigE camera 5 1 2 Power Supply The camera requires a single voltage input see Table 3 4 The camera meets all performance specifications using standard switching power supplies although well regulated linear power supplies provide optimum performance It is extremely important th
41. mum resolution 10245 fps 10863 fps not allowed ROI setting 1280 x 1024 SXGA 29 fps 58 fps 73 fps 1280 x 768 WXGA 39 fps 78 fps 97 fps 800 x 600 SVGA 79 fps 157 fps 195 fps 640 x 480 VGA 121 fps 241 fps 300 fps 544 x 1 9615 fps 10498 fps 10615 fps 544 x 1082 63 fps 125 fps 157 fps 1312 x 544 54 fps 107 fps 134 fps 1312 x 256 114 fps 227 fps 282 fps 544 x 544 125 fps 248 fps 308 fps 1024 x 1024 36 fps 72 fps 90 fps 1312x1 8116 fps 9537 fps 9815 fps Table 4 3 Frame rates of different ROI settings exposure time 10 us correction on and sequential readout mode a Figure 4 21 ROI configuration examples that are NOT allowed 4 3 2 ROI configuration In the MV1 D1312 l camera series the following two restrictions have to be respected for the ROI configuration The minimum width w of the ROI is camera model dependent consisting of 288 pixel in the MV1 D1312 1 40 camera of 416 pixel in the MV1 D1312 1 80 camera and of 544 pixel in the MV1 D1312 1 100 camera e The region of interest must overlap a minimum number of pixels centered to the left and to the right of the vertical middle line of the sensor ovl 32 For any camera model of the MV1 D1312 1 camera series the allowed ranges for the ROI settings can be deduced by the following formula Xmin max 0 656 ovl w Xmax min 656 ovl 1312 w where ovl is the overlap over the middle li
42. n this mode the camera is idle until it gets a signal to capture an image exposure n K ide X exposure n 1 lt Q ide gt Readoutn 1 idle gt Readout n Cidle gt Readout n 1 5 external trigger gt _ gt earliest possible trigger a Figure 4 6 Timing in triggered simultaneous readout mode 4 1 2 Readout Timing Sequential readout timing By default the camera is in free running mode and delivers images without any external control signals The sensor is operated in sequential readout mode which means that the sensor is read out after the exposure time Then the sensor is reset a new exposure starts and the readout of the image information begins again The data is output on the rising edge of the pixel clock The signals FRAME_VALID FVAL and LINE_VALID LVAL mask valid image information The signal SHUTTER indicates the active exposure period of the sensor and is shown for clarity only Simultaneous readout timing To achieve highest possible frame rates the camera must be set to Free running mode with simultaneous readout The camera continuously delivers images as fast as possible Exposure time of the next image can start during the readout time of the current image The data is output on the rising edge of the pixel clock The signals FRAME_VALID FVAL and LINE_VALID LVAL mask valid image information The signal SHUTTER indicates the active integration phase of the sensor and is shown for clarity only 4 1 Image Ac
43. ne and w is the width of the region of interest Any ROI settings in x direction exceeding the minimum ROI width must be mod ulo 32 MV1 D1312 1 40 MV1 D1312 1 80 MV1 D1312 I 100 ROI width w 288 1312 416 1312 544 1312 overlap ovl 144 208 272 width condition modulo 32 modulo 32 modulo 32 Table 4 4 Summary of the ROI configuration restrictions for the MV1 D1312 1 camera series indicating the minimum ROI width w and the required number of pixel overlap ovl over the sensor middle line The settings of the region of interest in x direction are restricted to modulo 32 see Table 4 5 FF There are no restrictions for the settings of the region of interest in y direction 4 3 3 Calculation of the maximum frame rate The frame rate mainly depends on the exposure time and readout time The frame rate is the inverse of the frame time fps tframe Calculation of the frame time sequential mode Urame 2 texp tro Typical values of the readout time t are given in table Table 4 6 Calculation of the frame time simultaneous mode The calculation of the frame time in simultaneous read out mode requires more detailed data input and is skipped here for the purpose of clarity cg A frame rate calculator for calculating the maximum frame rate is available in the support area of the Photonfocus website An overview of resulting frame rates in different exposure time settings i
44. ngs of the black level 4 2 2 LinLog Overview The LinLog technology from Photonfocus allows a logarithmic compression of high light intensities inside the pixel In contrast to the classical non integrating logarithmic pixel the LinLog pixel is an integrating pixel with global shutter and the possibility to control the transition between linear and logarithmic mode In situations involving high intrascene contrast a compression of the upper grey level region can be achieved with the LinLog technology At low intensities each pixel shows a linear response At high intensities the response changes to logarithmic compression see Fig 4 10 The transition region between linear and logarithmic response can be smoothly adjusted by software and is continuously differentiable and monotonic Grey Value 100 Linear Weak compression Response Resulting Linlog Response 0 Value2 Light Intensity Figure 4 10 Resulting LinLog2 response curve LinLog is controlled by up to 4 parameters Timel Time2 Valuel and Value2 Valuel and Value2 correspond to the LinLog voltage that is applied to the sensor The higher the parameters Valuel and Value respectively the stronger the compression for the high light intensities Timel 4 2 Pixel Response 25 4 Functionality and Time2 are normalised to the exposure time They can be set to a maximum value of 1000 which corresponds to the exposure time Examples in the following sec
45. nsiderations 6 3 Compliance CE Compliance Statement We Photonfocus AG CH 8853 Lachen Switzerland declare under our sole responsibility that the following products MV D1024 28 CL 10 MV D1024 80 CL 8 MV D1024 160 CL 8 MV D752 28 CL 10 MV D752 80 CL 8 MV D752 160 CL 8 MV D640 33 CL 10 MV D640 66 CL 10 MV D640 48 U2 8 MV D640C 33 CL 10 MV D640C 66 CL 10 MV D640C 48 U2 8 MV D1024E 40 MV D752E 40 MV D750E 20 CameraLink and USB2 0 Models MV D1024E 80 MV D1024E 160 MV D1024E 3D01 160 MV2 D1280 640 CL 8 SM2 D1024 80 VisionCam PS DS1 D1024 40 CL DS1 D1024 40 U2 DS1 D1024 80 CL DS1 D1024 160 CL DS1 D1312 160 CL MV1 D1312 1 40 CL MV1 D1312 1 80 CL MV1 D1312 1 160 CL EL1 D1312 160 CL Digipeater CLB26 are in compliance with the below mentioned standards according to the provisions of European Standards Directives EN 61 000 6 3 2001 EN 61 000 6 2 2001 EN 61 000 4 6 1996 EN 61 000 4 4 1996 EN 61 000 4 3 1996 EN 61 000 4 2 1995 EN 55 022 1994 Photonfocus AG December 2009 Figure 6 2 CE Compliance Statement 76 Warranty The manufacturer alone reserves the right to recognize warranty claims 7 1 Warranty Terms The manufacturer warrants to distributor and end customer that for a period of two years from the date of the shipment from manufacturer or distributor to end customer the Warranty Period that e the product will substantially confor
46. obe output needs a separate power supply Please see Section Section Fig 4 30 and Fig 4 31 for more information 48 4 5 Data Path Overview The data path is the path of the image from the output of the image sensor to the output of the camera The sequence of blocks is shown in figure Fig Figure 4 35 camera data path 4 5 Data Path Overview Image Sensor FPN Correction Digital Offset Digital Gain Y Look up table LUT Y 3x3 Convolver Y Crosshairs insertion Y Status line insertion Y Test images insertion Apply data resolution Image output 49 4 Functionality 4 6 Image Correction 4 6 1 Overview The camera possesses image pre processing features that compensate for non uniformities caused by the sensor the lens or the illumination This method of improving the image quality is generally known as Shading Correction or Flat Field Correction and consists of a combination of offset correction gain correction and pixel interpolation Since the correction is performed in hardware there is no performance limita tion of the cameras for high frame rates The offset correction subtracts a configurable positive or negative value from the live image and thus reduces the fixed pattern noise of the CMOS sensor In addition hot pixels can be removed by interpolation The gain co
47. ormally not visible when the sensor is positioned at the exit port of an integrating sphere where the illumination is diffuse 1 74 The camera should only be cleaned in ESD safe areas by ESD trained personnel using wrist straps Ideally the sensor should be cleaned in a clean environment Otherwise in dusty environments the sensor will immediately become dirty again after cleaning Use a high quality low pressure air duster e g Electrolube EAD400D pure compressed inert gas www electrolube com to blow off loose particles This step alone is usually sufficient to clean the sensor of the most common contaminants Workshop air supply is not appropriate and may cause permanent damage to the sensor If further cleaning is required use a suitable lens wiper or Q Tip moistened with an appropriate cleaning fluid to wipe the sensor surface as described below Examples of suitable lens cleaning materials are given in Table 6 1 Cleaning materials must be ESD safe lint free and free from particles that may scratch the sensor surface Do not use ordinary cotton buds These do not fulfil the above requirements and permanent damage to the sensor may result Wipe the sensor carefully and slowly First remove coarse particles and dirt from the sensor using Q Tips soaked in 2 propanol applying as little pressure as possible Using a method similar to that used for cleaning optical surfaces clean the sensor by starting at any corner of the sen
48. orrection matrix from the acquired image and interpolate the hot pixels see Section 4 6 2 50 ut 1 1 average i BAE Hilo ma gt ae 3211418 zu picture 1002 black reference offset correction image matrix Figure 4 36 Schematic presentation of the offset correction algorithm How to Obtain a Black Reference Image In order to improve the image quality the black reference image must meet certain demands e The black reference image must be obtained at no illumination e g with lens aperture closed or closed lens opening It may be necessary to adjust the black level offset of the camera In the histogram of the black reference image ideally there are no grey levels at value 0 DN after adjustment of the black level offset All pixels that are saturated black 0 DN will not be properly corrected see Fig 4 37 The peak in the histogram should be well below the hot pixel threshold of 1008 DN 12 bit e Camera settings may influence the grey level Therefore for best results the camera settings of the black reference image must be identical with the camera settings of the image to be corrected Histogram of the uncorrected black reference image T T T T T T black level offset ok black level offset too low Relative number of pixels 600 800 1000 Grey level 12 Bit DN 1200 1400 1600 Figure 4 37 Histogram of a prop
49. photon focus User Manual MV1 D1312 l Gigabit Ethernet Series CMOS Area Scan Camera MAN044 12 2009 V2 1 All information provided in this manual is believed to be accurate and reliable No responsibility is assumed by Photonfocus AG for its use Photonfocus AG reserves the right to make changes to this information without notice Reproduction of this manual in whole or in part by any means is prohibited without prior permission having been obtained from Photonfocus AG Contents 1 1 About Photonfocus t2 Contaci ae SE DE ee RE Ke Mate amp 5 13 Sales Offices 4 4 ind bak 44 dos Kb nnd b re dage slede Fa dad Au Me ayaa at dat MT KG Ss Gina SE Ge eRe wal ay Ese 19 Legend SR no NN ee Bk Be ee ee Bea eee Sc dado Red 2 How to get started GigE 3 Product Specification 3 1_Introduction e a oa a a aak aa a a a O a a 3 2 Feature Overview aaoo a a a a 3 3 Technical Specification 4 Functionality 41 Image Acquisitions 540802 ee eee k r FE dele er eee ie 4 1 1 Readout Modes 4 1 2 Readout Timing 4 1 3 Exposure Control 4 2 Pixel Response 4 2 1 Linear Response o e ea DIESE 4 3 1 Region of Interest ROI E ER D Oe ob 4 3 3 Calculation of the maximum frame rate 4 3 4 Multiple Regions of Interest available on request 4 4 Trigger and Strobe
50. ponsivity V J m2 20 400 10 200 0 200 300 400 500 600 700 800 900 1000 1100 Wavelength nm Figure 3 3 Spectral response of the A1312I image sensor NIR enhanced in the MV1 D1312I camera series 18 4 Functionality This chapter serves as an overview of the camera configuration modes and explains camera features The goal is to describe what can be done with the camera The setup of the MV1 D1312 1 series cameras is explained in later chapters 4 1 Image Acquisition 4 1 1 Readout Modes The MV1 D1312 1 CMOS cameras provide two different readout modes Sequential readout Frame time is the sum of exposure time and readout time Exposure time of the next image can only start if the readout time of the current image is finished Simultaneous readout interleave The frame time is determined by the maximum of the exposure time or of the readout time which ever of both is the longer one Exposure time of the next image can start during the readout time of the current image Readout Mode MV1 D1312 1 Series Sequential readout available Simultaneous readout available Table 4 1 Readout mode of MV1 D1312 Series camera The following figure illustrates the effect on the frame rate when using either the sequential readout mode or the simultaneous readout mode interleave exposure fps 1 readout time Frame rate fps Simultaneous HU readout mode SA ss fp
51. positive trigger edge and stops it when the preprogrammed exposure time has elapsed The exposure time is defined by the software Trigger controlled Exposure time In this trigger mode the exposure time is defined by the pulse width of the trigger pulse For an active high trigger signal the camera starts the exposure with the positive edge of the trigger signal and stops it with the negative edge 4 4 Trigger and Strobe 41 4 Functionality Machine Vision Flash System PC Power GigE Interface Card GigE Softtrigger Trigger Source Trigger Source Figure 4 30 Trigger source Machine Vision Flash System PC GigE Frame Grabber with FPGA Processor GigE Softtrigger GigE GigE i gt de GigE Softrigger _ Trigger Source oo y 1 0 Board OR Trigger Source gt oer no Figure 4 31 Trigger Inputs Multiple GigE solution 42 gt Trigger controlled exposure time is not available in simultaneous readout mode External Trigger with Camera controlled Exposure Time In the external trigger mode with camera controlled exposure time the rising edge of the trigger pulse starts the camera states machine which controls the sensor and optional an external strobe output Fig 4 32 shows the detailed timing diagram for the external trigger mode with camera controlled exposure time external trigger pulse input trigger after isolator trigg
52. possible settings of the ROI for each camera model is given in Tab ter line of the sensor as shown in Fig Fig and Fig 4 20 A list of le 4 5 gt 144 Pixel opt ote gt 144 Pixel gt 144 Pixel modulo 32 Pixel u gt 144 Pixel modulo 32 Pixel a b Figure 4 18 Possible configuration of the region of interest for the MV1 D1312 1 40 CMOS camera EIN It is recommended to re adjust the settings of the shading correction each time a new region of interest is selected 30 gt 208 Pixel gt 208 Pixel modulo 32 Pixel De u te gt 208 Pixel gt 208 Pixel modulo 32 Pixel a b Figure 4 19 Possible configuration of the region of interest with MV1 D1312 1 80 CMOS camera gt 272 pixel gt 272 pixel modulo 32 pixel ad u a gt e gt 272 pixel gt 272 pixel modulo 32 pixel a b Figure 4 20 Possible configuration of the region of interest with MV1 D1312 I 100 CMOS camera Any region of interest may NOT be placed outside of the center of the sensor Examples shown in Fig illustrate configurations of the ROI that are NOT allowed 4 3 Reduction of Image Size 31 4 Functionality ROI Dimension Standard MV1 D1312 1 40 MV1 D1312 1 80 MV1 D1312 1 100 1312 x 1082 full resolution 27 fps 54 fps 67 fps 288 x 1 mini
53. quisition 21 4 Functionality PCLK LI Lf LI Lf LI LM LI Lf LI LM LI LN LI LA Lf Frame Time SHUTTER l Exposure Time FVAL i u 7 HA c m CPRE Linepause Linepause Linepause First Line Last Line DVAL Figure 4 7 Timing diagram of sequential readout mode 22 Peck DD Frame Time SHUTTER l l Exposure Exposure Time Time FVAL l 1 Li Io CPRE Linepause Linepause Linepause CPRE First Line Last Line DVAL Figure 4 8 Timing diagram of simultaneous readout mode readout time gt exposure time pek MIMO A Frame Time SHUTTER l l b gt 4 H Exposure Time SSS EE FVAL SS CPRE Linepause Linepause Linepause CPRE LVAL A PP ULL First Line Last Line DVAL Figure 4 9 Timing diagram simultaneous readout mode readout time lt exposure time 4 1 Image Acquisition 23 4 Functionality Frame time Exposure time PCLK Frame time is the inverse of the frame rate Period during which the pixels are integrating the incoming light Pixel clock on CameraLink interface SHUTTER FVAL Frame Valid Internal signal shown only for clarity Is high during the exposure time Is high while the data of one complete frame are transferred LVAL Line Valid Is high while the data of one line are transferred Example To transfer an image with 640x480 pixels there are 480 LVAL within one FVAL act
54. r supply plug from the solder side The pin assignment of the power supply plug is given in Table A 2 It is extremely important that you apply the appropriate voltages to your camera Incorrect voltages will damage or destroy the camera Figure A 1 Power connector assembly Connector Type Order Nr 7 pole plastic 99 0421 00 07 7 pole metal 99 0421 10 07 8 pole TBD Table A 1 Power supply connectors Binder subminiature series 712 81 A Pinouts Pin 1 0 Type Name Description VDD 12 V DC 10 GND Ground RESERVED STROBE VDD Do not connect Signal VDD 5 15 V DC STROBE Strobe control isolated TRIGGER SGND External trigger isolated 5 15V DC Signal ground RESERVED Table A 2 Power supply plug pin assignment 82 Do not connect Revision History Revision 2 1 2 0 Date December 2009 October 2009 Changes Chapter 3 maximal framerate for MV1 D1312 1 100 corrected Description of new features added MROI Region LUT Crosshairs Sections in Chapter Functionality and Hardware Interface reordered Added example images to some sections MV1 D1312 1 100 added Table 3 2 Footnote about unsharp image in NIR sensor added Chapter 4 3 3 Removed note that frame rate calculation is available on request 1 0 Mai 2009 First release 83
55. ra For other transfer functions the user can define his own LUT file Some commonly used transfer curves are shown in Fig Line a denotes a negative or inverse transformation line b enhances the image contrast between grey values x0 and x1 Line c shows brightness thresholding and the result is an image with only black and white grey levels and line d applies a gamma correction see also Section 4 8 2 4 8 1 Gain The Gain mode performs a digital linear amplification with clamping see Fig 4 43 It is configurable in the range from 1 0 to 4 0 e g 1 234 4 7 Digital Gain and Offset 55 4 Functionality Figure 4 42 Commonly used LUT transfer curves Grey level transformation Gain y 255 1023 a x 300 T T T T 250 200 150 100 ooo uno et sooo y grey level output value 8 bit DN 50 1 1 0 200 400 600 800 1000 1200 x grey level input value 10 bit DN Figure 4 43 Applying a linear gain with clamping to an image 56 4 8 2 Gamma The Gamma mode performs an exponential amplification configurable in the range from 0 4 to 4 0 Gamma gt 1 0 results in an attenuation of the image see Fig 4 44 gamma lt 1 0 results in an amplification see Fig 4 45 Gamma correction is often used for tone mapping and better display of results on monitor screens Grey level transformation Gamma y 255 1023 x y gt 1 300 T
56. rrection can be used to flatten uneven illumination or to compensate shading effects of a lens Both offset and gain correction work on a pixel per pixel basis i e every pixel is corrected separately For the correction a black reference and a grey reference image are required Then the correction values are determined automatically in the camera Do not set any reference images when gain or LUT is enabled Read the follow ing sections very carefully Correction values of both reference images can be saved into the internal flash memory but this overwrites the factory presets Then the reference images that are delivered by factory cannot be restored anymore 4 6 2 Offset Correction FPN Hot Pixels The offset correction is based on a black reference image which is taken at no illumination e g lens aperture completely closed The black reference image contains the fixed pattern noise of the sensor which can be subtracted from the live images in order to minimise the static noise Offset correction algorithm After configuring the camera with a black reference image the camera is ready to apply the offset correction Determine the average value of the black reference image Subtract the black reference image from the average value Mark pixels that have a grey level higher than 1008 DN 12 bit as hot pixels Store the result in the camera as the offset correction matrix oe AL RS During image acquisition subtract the c
57. s 1 exposure time Pt Sequential rem readout mode T fps 1 readout time exposure time exposure time lt readout time exposure time gt readout time A Exposure time exposure time readout time Figure 4 1 Frame rate in sequential readout mode and simultaneous readout mode Sequential readout mode For the calculation of the frame rate only a single formula applies frames per second equal to the inverse of the sum of exposure time and readout time 19 4 Functionality Simultaneous readout mode exposure time lt readout time The frame rate is given by the readout time Frames per second equal to the inverse of the readout time Simultaneous readout mode exposure time gt readout time The frame rate is given by the exposure time Frames per second equal to the inverse of the exposure time The simultaneous readout mode allows higher frame rate However if the exposure time greatly exceeds the readout time then the effect on the frame rate is neglectable C ___Insimultaneous readout mode image output faces minor limitations The overall linear sensor reponse is partially restricted in the lower grey scale region When changing readout mode from sequential to simultaneous readout mode E or vice versa new settings of the BlackLevelOffset and of the image correction are required Sequential readout By default the camera continuously delivers images as fast as possib
58. s given in table Table 4 3 Reduction of Image Size 33 4 Functionality Width ROI X MV1 D1312 1 40 ROI X MV1 D1312 1 80 ROI X MV1 D1312 1 100 288 512 not available not available 320 480 512 not available not available 352 448 512 not available not available 384 416 512 not available not available 416 384 512 448 not available 448 352 512 416 448 not available 480 320 520 384 448 not available 512 288 512 352 448 not available 544 256 512 320 448 384 576 224 512 288 448 352 384 608 192 512 256 448 320 352 640 160 512 224 448 288 384 672 128 512 192 448 256 384 704 96 512 160 448 224 384 736 64 512 128 448 192 384 768 32 512 96 448 160 384 800 0 512 64 448 128 384 832 0 480 32 448 96 384 864 0 448 0 448 64 384 896 0 416 0 416 32 384 1312 0 0 0 Table 4 5 Some possible ROI X settings ROI Dimension MV1 D1312 1 40 MV1 D1312 1 80 MV1 D1312 1 100 1312 x 1082 t 36 46 ms t 18 23 ms t 14 59 ms 1024 x 512 tro 13 57 ms t o 6 78 ms tro 5 43 ms 1024 x 256 tro 6 78 ms t o 3 39 ms tro 2 73 ms Table 4 6 Read out time at different ROI settings for the MV1 D1312 I CMOS camera series in sequential read out mode 4 3 4 Multiple Regions of Interest available on request The MV
59. se a graphic software tool to display the histogram In the LFSR linear feedback shift register mode the camera generates a constant pseudo random test pattern containing all grey levels If the data transmission is error free the histogram of the received LFSR test pattern will be flat Fig 4 60 On the other hand a non flat histogram Fig indicates problems that may be caused either by the cable by the connectors or by the frame grabber 68 Figure 4 59 LFSR linear feedback shift register test image A possible origin of failure message can be caused by the CameraLink cable amp which exceeds the maximum length Also CameraLink cables may suffer either from stress due to wrong installation or from severe electromagnetic interfer ence 4 12 Test Images 69 4 Functionality Some thinner CameraLink cables have a predefined direction In these cables SD not all twisted pairs are separately shielded to meet the RS644 standard These pairs are used for the transmission of the RX TX and for the CC1 to CC4 low frequency control signals M Histogramm Port A Picture 620 Port A Picture 620 127 255 Figure 4 60 LFSR test pattern received at the frame grabber and typical histogram for error free data transmission M Histogramm Port A Picture 440 Port Picture 440 Mi ahn alu I Figure 4 61 LFSR test pattern received at the frame grabber and histogram containing transmission errors Ca
60. sor and working towards the opposite corner Finally repeat the procedure with methanol to remove streaks It is imperative that no pressure be applied to the surface of the sensor or to the black globe top material if present surrounding the optically active surface during the cleaning process Iso Propanol Germany Table 6 1 Recommended materials for sensor cleaning Product Supplier Remark EAD400D Airduster Electrolube UK www electrolube com Anticon Gold 9 x 9 Wiper Milliken USA ESD safe and suitable for class 100 environments www milliken com TX4025 Wiper Texwipe www texwipe com Transplex Swab Texwipe Small Q Tips SWABS Q tips Hans J Michael GmbH www hjm de BB 003 Germany Large Q Tips SWABS Q tips Hans J Michael GmbH CA 003 Germany Point Slim HUBY 340 Q tips Hans J Michael GmbH Germany Methanol Fluid Johnson Matthey GmbH Semiconductor Grade Germany 99 9 min Assay Merck 12 6024 UN1230 slightly flammable and poisonous www alfa chemcat com 2 Propanol Fluid Johnson Matthey GmbH Semiconductor Grade 99 5 min Assay Merck 12 5227 UN1219 slightly flammable www alfa chemcat com For cleaning the sensor Photonfocus recommends the products available from the suppliers as listed in Table 6 1 D 6 2 Optical Interface Cleaning tools except chemicals can be purchased directly from Photonfocus www photonfocus com 75 6 Mechanical and Optical Co
61. sure by a user defined time see Section 4 4 4 This often used to start the exposure after the trigger to a flash lighting source 4 4 2 Trigger Source The trigger signal can be configured to be active high or active low One of the following trigger sources can be used Free running The trigger is generated internally by the camera Exposure starts immediately after the camera is ready and the maximal possible frame rate is attained if Constant Frame Rate mode is disabled In Constant Frame Rate mode exposure starts after a user specified time Frame Time has elapsed from the previous exposure start and therefore the frame rate is set to a user defined value Interface Trigger In the interface trigger mode the trigger signal is applied to the camera by the Gigabit Ethernet interface Fig shows a diagram of the interface trigger setup I O Trigger In the I O trigger mode the trigger signal is applied directly to the camera by the power supply connector via an optocoupler A setup of this mode is shown in Fig 4 30 The electrical interface of the I O trigger input and the strobe output is described in Section 5 1 3 4 4 3 Exposure Time Control Depending on the trigger mode the exposure time can be determined either by the camera or by the trigger signal itself Camera controlled Exposure time In this trigger mode the exposure time is defined by the camera For an active high trigger signal the camera starts the exposure with a
62. tions illustrate the LinLog feature LinLog1 In the simplest way the pixels are operated with a constant LinLog voltage which defines the knee point of the transition This procedure has the drawback that the linear response curve changes directly to a logarithmic curve leading to a poor grey resolution in the logarithmic region see Fig V LinLog Value1 Value2 0 Time1 Time2 max t 1000 Figure 4 11 Constant LinLog voltage in the Linlog1 mode Typical LinLog1 Response Curve Varying Parameter Value1 Time1 1000 Time2 1000 Value2 Value1 300 T T T T T 250 200 150 100 Output grey level 8 bit DN 50 0 Illumination Intensity Figure 4 12 Response curve for different LinLog settings in LinLog1 mode 26 V1 15 Vi 16 vi 17 V1 18 V1 19 LinLog2 To get more grey resolution in the LinLog mode the LinLog2 procedure was developed In LinLog2 mode a switching between two different logarithmic compressions occurs during the exposure time see Fig 4 13 The exposure starts with strong compression with a high LinLog voltage Valuel At Timel the LinLog voltage is switched to a lower voltage resulting in a weaker compression This procedure gives a LinLog response curve with more grey resolution Fig 4 14 and Fig 4 15 show how the response curve is controlled by the three parameters Valuel Value and the LinLog time Timel CE Settings in LinLog2 mode en
63. y MV1 D1312 1 40 MV1 D1312 1 40 Timing Parameter Minimum Maximum ta iso input 45 ns 60 ns tjitter 0 100 ns ttrigger delay 1 68 s tburst trigger delay 1 68 s thurst period time depends on camera settings 1 68 s tirigger offset NON burst mode 400 ns 400 ns ttrigger offset Durst mode 500 ns 500 ns exposure 10 us 1 68 s tstrobe delay 0 1 68 s tstrobe offset NON burst mode 400 ns 400 ns tstrobe oftset Durst mode 500 ns tstrobe duration 1 68 s ta iso output 60 ns tirigger pulsewidth 200 ns n a Number of bursts n 1 30000 Table 4 8 Summary of timing parameters relevant in the external trigger mode using camera MV1 D1312 1 40 46 MV1 D1312 1 80 MV1 D1312 1 80 Timing Parameter Minimum Maximum ta iso input 45 ns 60 ns tjitter 50 ns tirigger delay tburst trigger delay thurst period time depends on camera settings ttrigger offset NON burst mode 200 ns tirigger o set burst mode 250 ns texposure tstrobe de tstrobe offset non burst mode tstrobe offset burst mode tstrobe duration ta iso output 45 ns 60 ns tirigger pulsewidth 200 ns n a Number of bursts n 1 30000 Table 4 9 Summary of timing parameters relevant in the external trigger mode using camera MV1 D1312 1 80 MV1 D1312 1 100 MV1 D131
64. ynchronous design of the FPGA state machines A second counter determines the strobe duration tstrobe duration Strobe duration For a robust system design the strobe output is also isolated from the camera electronic which leads to an additional delay of 4 4 Trigger and Strobe 43 4 Functionality EE a Table 4 9jand Table gives an overview over the minimum and maximum values of the parameters External Trigger with Pulsewidth controlled Exposure Time In the external trigger mode with Pulsewidth controlled exposure time the rising edge of the trigger pulse starts the camera states machine which controls the sensor The falling edge of the trigger pulse stops the image acquisition Additionally the optional external strobe output is controlled by the rising edge of the trigger pulse Timing diagram Fig 4 33 shows the detailed timing for the external trigger mode with pulse width controlled exposure time t external trigger pulse input exposure trigger after isolator trigger pulse rising edge camera control t jitter l delayed trigger rising edge for shutter set t trigger delay trigger pulse falling edge camera control Gitter delayed trigger falling edge shutter reset Cds internal shutter control Cop t exposure ee m delayed trigger for strobe control t strobe delay internal strobe control tstrobe offset la tstrobe duration external stro

User Manual MV1-D1312(I) Gigabit Ethernet Series

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