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MPEG-4 video transmission for ambulatory application PowerPoint PPT Presentation

MPEG-4 video transmission for ambulatory application Mamoru Hashimoto NEC Corporation Satellite Ambulance Hospital Multi Channel Patient Video Multiplexing Live Videos Control Data Transport Data Camera Cameras Electro Cardiogram Seamless Multi Modal Multi Screens Control

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MPEG-4 video transmission for ambulatory application

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Mpeg 4 video transmission for ambulatory application l.jpg

MPEG-4 video transmissionfor ambulatory application

Mamoru Hashimoto

NEC Corporation


Emergency medical video transmission l.jpg

Satellite

Ambulance

Hospital

Multi Channel

Patient

Video

Multiplexing

Live Videos

Control

Data Transport

Data

Camera

Cameras

Electro

Cardiogram

Seamless

Multi Modal

Multi Screens

Control

Medical Equipments

Emergency medical video transmission

Transmission of video from the moving ambulance

to the hospital

Workshop on Standardization in E-health


Assumption for system configuration l.jpg

Assumption for system configuration

Ambulance

May be plural

Video camera

Transmitter

Computer

NTSC

(can be PAL)

100BASE-TX

Wireless communications

Hospital

May be plural

Receiver

Computer

projector

100BASE-TX

Workshop on Standardization in E-health


Processing in ambulance side l.jpg

Processing in ambulance side

Digitizing of video signal with

video capture cards

Capturing

Transforming of digitized video

signal into compressed bitstream

Encoding

Dividing the bitstream into packets

with bitstream format preserved

Packetizing

Adding RTP header to packets

and transmitting with UDP/IP

Transmitting

Workshop on Standardization in E-health


Processing in hospital side l.jpg

Processing in hospital side

Receiving packets sent in UDP/IP

Receiving

Removing RTP header from packetsand

reconstructing bitstream for one frame

Depacketizing

Decoding bitstream and producing image

data for one frame

Decoding

Displaying image data for one frame

Displaying

Workshop on Standardization in E-health


Encoding decoding process l.jpg

Encoding / decoding process

  • Using self-made software codec conforming to MPEG-4 Visual simple profile

  • The software codec can process the video stream of QVGA resolution and 15 fps (including communication processing)

Workshop on Standardization in E-health


Transmitting receiving process with rtp protocol l.jpg

Transmitting / receiving process with RTP protocol

  • Adding RTP header and transmitting / receiving the packets in UDP/IP

  • Detecting disorder, packet loss and fluctuation of arrival with sequence number and timestamp

  • Dividing MPEG-4 bitstream into packets in accordance with RFC3016

  • Not using RTSP

Workshop on Standardization in E-health


An algorithm for concealing packet loss l.jpg

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

Workshop on Standardization in E-health


About measures for loss of rtp packets l.jpg

About measures for loss of RTP packets

  • Concealment process is CPU intensive

  • With forward error correction codes (even with the simplest parity codes), packet loss can be recovered

  • For RTP packets, RFC2733 can be used; but it is restricted to continuous 24 packets

  • Underlying protocols is responsible?

Workshop on Standardization in E-health


Future works l.jpg

Future works

  • To conduct the video transmission experiment with experimental vehicles

  • To construct effective and efficient error correcting codes

  • To determine the necessary resolution and bitrate for medical image

  • To find more appropriate underlying protocols (UDP/IP is not necessary)

Workshop on Standardization in E-health


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