Optimized hybrid transform coding for very low bit rates: videotelephony communication on personal computer

Gerard Eude; Jean-Claude Schmitt

doi:10.1117/12.174964

2 May 1994 Optimized hybrid transform coding for very low bit rates: videotelephony communication on personal computer

Gerard Eude, Jean-Claude Schmitt

Proceedings Volume 2187, Digital Video Compression on Personal Computers: Algorithms and Technologies; (1994) https://doi.org/10.1117/12.174964
Event: IS&T/SPIE 1994 International Symposium on Electronic Imaging: Science and Technology, 1994, San Jose, CA, United States

Abstract

This paper describes a `very low bitrate visual telephony application' demonstrator which was designed to be used on the Public Switched Telephony Network for many multimedia purposes. This development was done by CNET in coordination with the european COST211^ter project with the aim to demonstrate videotelephony at very low bit rates. The main concern was to optimize a video coding algorithm based on the CCITT H.2161 existing standard and directly derived from the COST211^ter simulation model. The different signals which are needed for a videotelephony communication, video, speech, data and control are modulated and transmitted at a bitrate contained between 9.6 kbit/s and 28.8 kbit/s. The description of the demonstrator is given, including video algorithm and system multiplex specifications. The reasons of the choice of the video format and algorithm are also discussed. A friendly software application has been developed to run videotelephony within a Macintosh computer environment. This program uses the QuickTime routines to record and to play the videophone pictures to or from the hard disk. Single pictures or large sequences can be grabbed to the hard disk. Data can also be transmitted by opening, through the audio/video multiplex a data channel of some kbit/s in the video channel, allowing minimal groupwave application.

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Gerard Eude and Jean-Claude Schmitt "Optimized hybrid transform coding for very low bit rates: videotelephony communication on personal computer", Proc. SPIE 2187, Digital Video Compression on Personal Computers: Algorithms and Technologies, (2 May 1994); https://doi.org/10.1117/12.174964

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KEYWORDS

Video

Video coding

Computer programming

Digital signal processing

Motion estimation

Data communications

Standards development

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