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Proceedings Paper

Subjective evaluation of MPEG-2 video with and without B frames
Author(s): Gregory W. Cermak; Ernest P. Tweedy
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Paper Abstract

Two studies examined the effect of B-frames on subjective quality of MPEG-2 video. One study used consumer judgments in a variant of the standard CCIR Recommendation 500-5 procedure for collecting subjective evaluations. The other study used the judgments of a single expert in adjusting the bit rate necessary for MPEG-2 without B-frames to be subjectively equal to MPEG-2 with B-frames at a given bit rate. The results of the two studies were qualitatively similar. Summary of results: Picture quality improved with increase in bit rate until a saturation point was reached. The introduction of B-frames improved picture quality, especially for difficult source material. This was more noticeable at the lower bit rates (e.g., 3 Mb/s). The difference in bit rate between MPEG-2 with and without B-frames varied substantially with the source material. For example, for basketball, 5 Mb/s with B-frames was subjectively equal to 8 Mb/s without B-frames, but for other material the difference was near zero.

Paper Details

Date Published: 22 November 1999
PDF: 8 pages
Proc. SPIE 3845, Multimedia Systems and Applications II, (22 November 1999); doi: 10.1117/12.371207
Show Author Affiliations
Gregory W. Cermak, GTE Labs. Inc. (United States)
Ernest P. Tweedy, GTE Labs. Inc. (United States)


Published in SPIE Proceedings Vol. 3845:
Multimedia Systems and Applications II
Andrew G. Tescher; Bhaskaran Vasudev; V. Michael Bove; Barbara Derryberry, Editor(s)

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