静止画像の可逆圧縮・高速転送に関する試行
Contents
1. LAN 13 CCD 15 86 1 14 Visua1 C LAN CCD 512 440 6 5 Frame Secl BMP YUV2. 14 16 1 LAN 14 2008 2 Microsoft Visual Studio NET Professional Edition Verson 2002 3 Qcam Pro 4000 2003 4 USB http mobi quntous com tsuka programming usbcamera html 2003 5 NETMaster DirectShow NET http www codepro ject com cs media directshownet asp 2003 LAN 6 C 15 2004 NET Frame work Microsof
3. Frame Secl Frame Secl 1000 5 2 1 1 3 BMP 834 1IFrame Secl JPEG 30 0 Frame Sec GIF TIFE PNG JPEG GIF BMP BMP ACK
4. 5 4 6 USB LAN C Draw Image Save Image 1 4 PNG ow complexity
5. DOCSIS DirectShow Cient Remote Server LocalClient 230454 HostName kajsa12 TP Address 172161113 1721611 1782124 Port No 55001 to 172 16 11 172 9000 1721611172 oo 5069 21 27 Frame Sec 230454 B 4691 Frame Sec 14 E 2 1 i Image FromStream Image 7 4 2 6 7 230 454 BMP ACK Acknow ledge
6. 5 6 6 ASS os LAN 4 C Draw Image Save BMP TIFF GIE PNG JPEG LX LAN 1 5 2 1 24 bits pixel Tag LZW Image Tag
7. ACK DirectShow 10ms ACK ACK S Send E End G GrabStart B CallBack A S E G B 6 4 Send End ACK GrabStar Call Back 4 4 4 1
8. 1 DirectShow USB endey SetCallBack RGB Bitmap Net Sockts Socket s s1 s Bind s Listen Net Sockts Socket c Net Dns Resolve s BeginAccept c Connect s EndAccept s1 BeginReceive s1 EndReceive s1 Send c Send c BeginReceive c EndReceive 3 3 LAN
9. 11 1 CCD Windows USB PC Web USB CCD 1 eo 2 USB Microsoft Visual Studio NET 2 Visual C Visual C Visual C Visual Basic LAN 2 2 1 USB
10. 39 2004 11 16 Feasibility Study of Lossless Compression and Fast Transfer of Still Images Kiyomitsu KAJISA For the purpose of applications of remote product tests and remote product monitoring to verify whether the lossless image compression is useful or not from the view point of the speed of continuous transfer of still images using a non expensive USB camera we implemented test programs and tested Results using PNG and TIFF images by standard 1ossless image compression show that overhead caused by the lossless compression and decompression introduces approximately 1 4 transfer delay compared with the case of no image compression though the transfer speed of the compressed images themselves is shorten This technical paper reports the method of capturing still 1images asynchronously using a USB camera and transferring images via 100Mbps LAN asynchronously implementation of an image capture client test program and an image display server test program experiments and results of using the test programs and considerations of the exDer1ments Keywords Lossless Compression Still Image USB Camera TCP IP C Sharp 1 USB LAN
11. The Code Project DShowNETdll 52KB 5 12 1 DirectShow a interface DShowNET IGraphBuilder ISampleGrabber IMediaControl IVideoWindow IMediaEventEx b class DShowNET VideolnfoHeader AMMediaTvpe c DShowNET IGraphBuilder AddFilter 1CaptureGraphBuilder2 RenderStream ISampleGrabber GetConnectedMediaType ISampleGrabber SetBufferSamples ISamp leGrabber SetOneShot ISampleGrabber SetCallback ISampleGrabberCB BufferCB IVideoWindow SetWindowPosition IMediaEventEx GetEvent IMediaEventEx FreeEventParams VFW Video For Windows C VFW DirectX VFW USB DirectShow
12. 5 3 LAN 100Mbps NE Nu 8 4 5 i 6 15 mm i Bytes 34 1 230 454 TIFF 18 5 202 893 36 425 140 058 Pentium4 2GHz LZW 4 LAN 100Mbps F s F s Bytes Pentium4 2 4GHz Pentium4 2GHz 5 LAN 100Mbps ee PA Pentium4 2GHz Pentium4 2 4GHz 4 3 2 JPEG Me BMP pi eit JP BMP BMP TIFF 75 PNG 77 PNG BMP 63 LAN
13. File Format 24 bits pixel LZW 8 bits pixel 256 LZ77 2 Huffman 24 bits pixel 24 bits pixel 1 20 Graphics Interchange Format Portable Network Graphics Joint Photographic Experts Group GIF 256 2 4 7 DirectShow stream Image Image Save
14. 3 1 14 D TCP IP 100Mbps 1Gbps LAN 15 7 3 ACK Acknowledge 3 2
15. System Drawing IHmage Image Image M R230454 ACK 9697 Stream 230454 320x240 ie 407 R7 R73000 R73000 R11454 230454 Local Seryer Host Name IP Address _ Remote Client IP Address 1721611 1732 KAJISAa11 172 16 11 172 PortNo 6 orr ww i EE Acknowledge Nr EE ee far Fi kajisa12 So RE kaies1 172 16 11 173 172 16 11 172 8 LAN 5 5 1 Windows XP Home Edition Pentium 4 2 4GHz2z Pentium 4 2GHz2
16. USB PC Web USB CCD 2 85 30 160X120 8320X240 640X480 2 USB 3 820X240 DE 2 2 USB Microsoft DirectX DirectShow DirectX 8D API DirectShow API Windows XP DirectX8 1 DirectX9 0b Microsoft Windows XP DirectX9 0b DirectShow VB C C C
17. t Visual Studio NET 2003 8 D C Kay and J R Levne MbCD 1995 7 9 J Miano Compressed Image File Formats Addison Wesley Longman Inc 1999 10 G Roelofs PNG The Defnitive Guide OReilly amp Associates Inc 1999
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