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Optical Engineering

Low Bit Rate Motion Video Coder/Decoder For Teleconferencing
Author(s): T. Koga; K. Niwa; Y. Iijima; K. Iinuma
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Paper Abstract

This paper describes motion video compression transmission for teleconferencing at a subprimary rate, i.e., at 384 kbits/s, including audio signal through the integrated services digital network (ISDN) HO channel. A subprimary rate video coder/decoder (codec), NETEC-XV, is available commercially that can operate at any bit rate (in multiples of 64 kbits/s) from 384 to 2048 kbits/s. In this paper, new algorithms are described that have been very useful in lowering the bit rate to 384 kbits/s. These algorithms are (1) separation of moving and still parts, followed by encoding of the two parts using different sets of parameters, and (2) scene change detection and its application to encoding parameter control. According to a brief subjective evaluation, the codec provides good picture quality even at a transmission bit rate of 384 kbits/s.

Paper Details

Date Published: 1 July 1987
PDF: 6 pages
Opt. Eng. 26(7) 267590 doi: 10.1117/12.7974122
Published in: Optical Engineering Volume 26, Issue 7
Show Author Affiliations
T. Koga, NEC Corporation (Japan)
K. Niwa, NEC Corporation (Japan)
Y. Iijima, NEC Corporation (Japan)
K. Iinuma, NEC Corporation (Japan)

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