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Proceedings Paper

Consumer judgments of MPEG1 video
Author(s): Gregory W. Cermak; Ernest P. Tweedy; Sandra K. Teare; James C. Stoddard
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Paper Abstract

We report a test of MPEG1 compressed video. Each of twelve short standard test scenes was processed through seven versions of MPEG1 and through four comparison systems, yielding a total of 132 processed scenes. The MPEG1 versions were at bit rates of 0.9, 1.2, and 1.8 Mb/s. The comparison systems included VHS VCR and simulated cable TV. Consumers judged the quality of each of the 132 scenes in a laboratory viewing room, using high quality playback equipment, and according to standard procedures of the international standards community. Consumers rated the quality of MPEG1 at 1.8 Mb/s as perceptibly different from a standard unprocessed signal but not annoying. However, MPEG1 at 1.8 Mb/s was also judged to be somewhat less good than VHS. Varying the bit rate in the range 0.9 Mb/s to 1.8 Mb/s for MPEG1 coding had a substantial effect on consumers' judgments of video quality: the higher the bit rate the better the judged quality. The 12 test scenes from the ISO MPEG committee differ in their ability to discriminate codecs when judged by consumers. Demographic differences among consumers did not affect the quality ratings.

Paper Details

Date Published: 24 November 1995
PDF: 11 pages
Proc. SPIE 2609, Hybrid Fiber-Coax Systems, (24 November 1995); doi: 10.1117/12.227275
Show Author Affiliations
Gregory W. Cermak, GTE Labs., Inc. (United States)
Ernest P. Tweedy, GTE Labs., Inc. (United States)
Sandra K. Teare, GTE Labs., Inc. (United States)
James C. Stoddard, GTE Labs., Inc. (United States)

Published in SPIE Proceedings Vol. 2609:
Hybrid Fiber-Coax Systems
Wai Sum Lai; Sam T. Jewell, Editor(s)

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