17 April 1995 Very low bit rate coding for PSTN videotelephony on personal computer: part 2
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Abstract
The part 1 of this paper was presented during the 1994 SPIE/IS&T Symposium. A specific hardware executing a proprietary VCS1 algorithm (based on COST211ter Group specifications) was described. This hardware was connected via a serial link to a Macintosh computer in order to make a video telephony application on a Public Switching Telephony Network in a Macintosh environment. This codec has evolved to support TMN4 which is the today's state of the art of the ITU-T group for very low bit rate coding. Due to the low frame rate of encoded pictures and the increasing available power on personal computers, the implementation of such an algorithm in software becomes now possible. The software decoder part is now running in real time on different Macintosh personal computers. In this paper, the decoder implementation is described and the time spent in the different parts of the decoding process is discussed. Different comparisons are made: decoder written in `C' language and in 680 X 0 assembler language on the first side, decoder implemented on 680 X 0 class machines and on PowerMacintosh class machines on the other side.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jean-Claude Schmitt, Jean-Claude Schmitt, Gerard Eude, Gerard Eude, } "Very low bit rate coding for PSTN videotelephony on personal computer: part 2", Proc. SPIE 2419, Digital Video Compression: Algorithms and Technologies 1995, (17 April 1995); doi: 10.1117/12.206388; https://doi.org/10.1117/12.206388
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