International Telecommunication Union Workshop on Standardization in E-health Geneva, 23-25 May 2003 MPEG-4 video transmission for ambulatory application.

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Presentation transcript:

International Telecommunication Union Workshop on Standardization in E-health Geneva, May 2003 MPEG-4 video transmission for ambulatory application Mamoru Hashimoto NEC Corporation

ITU-T May 2003 Workshop on Standardization in E-health Emergency medical video transmission Transmission of video from the moving ambulance to the hospital Multiplexing Data Transport Seamless Multi Screens Ambulance Patient Live Videos Multi Channel Hospital Camera Video Control Data Multi Modal Control Medical Equipments Cameras Electro Cardiogram Satellite

ITU-T May 2003 Workshop on Standardization in E-health Assumption for system configuration Computer Transmitter Receiver Computer Video camera NTSC (can be PAL) 100BASE-TX projector Ambulance Hospital May be plural 100BASE-TX Wireless communications May be plural

ITU-T May 2003 Workshop on Standardization in E-health Processing in ambulance side Capturing Encoding Packetizing Transmitting Digitizing of video signal with video capture cards Transforming of digitized video signal into compressed bitstream Dividing the bitstream into packets with bitstream format preserved Adding RTP header to packets and transmitting with UDP/IP

ITU-T May 2003 Workshop on Standardization in E-health Processing in hospital side Receiving Depacketizing Decoding Displaying Receiving packets sent in UDP/IP Removing RTP header from packets and reconstructing bitstream for one frame Decoding bitstream and producing image data for one frame Displaying image data for one frame

ITU-T May 2003 Workshop on Standardization in E-health Encoding / decoding process o Using self-made software codec conforming to MPEG-4 Visual simple profile o The software codec can process the video stream of QVGA resolution and 15 fps (including communication processing)

ITU-T May 2003 Workshop on Standardization in E-health Transmitting / receiving process with RTP protocol o Adding RTP header and transmitting / receiving the packets in UDP/IP o Detecting disorder, packet loss and fluctuation of arrival with sequence number and timestamp o Dividing MPEG-4 bitstream into packets in accordance with RFC3016 o Not using RTSP

ITU-T May 2003 Workshop on Standardization in E-health An algorithm for concealing packet loss Using the spatial similarity in the picture (outside of the standards) Odd line picture Even line picture Before transformation After transformation

ITU-T May 2003 Workshop on Standardization in E-health About measures for loss of RTP packets o Concealment process is CPU intensive o With forward error correction codes (even with the simplest parity codes), packet loss can be recovered o For RTP packets, RFC2733 can be used; but it is restricted to continuous 24 packets o Underlying protocols is responsible?

ITU-T May 2003 Workshop on Standardization in E-health Future works o To conduct the video transmission experiment with experimental vehicles o To construct effective and efficient error correcting codes o To determine the necessary resolution and bitrate for medical image o To find more appropriate underlying protocols (UDP/IP is not necessary)