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Proceedings Paper

Improved estimation of quantizer moderators in MPEG-2 rate control using a novel robust estimate and a family of exponential modulators
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Paper Abstract

The Rate Control phase in MPEG-2 is crucial for the encoding of video sequences for two reasons. First, for timely delivery of video without buffer overflows or underfiows and second for determining indirectly the encoded video quality through moderation ofthe quantization parameter on a macro-block basis. We propose a novel robust estimate which combines local activity estimates with the average activity ofthe previously encoded frame for improving the rate distortion performance of MPEG-2. We then propose a family of exponential modulators for reducing the "over-normalization" effect which occurs when the activity of the macro-block to be encoded is higher than the activity of the previously encoded frame. Extensive experiments show that the proposed low complexity schemes outperform MPEG-2 in terms of PSNR values for the same number of bits produced. We report increases up to 5 db for the luminance component and up to 3.5 db and 3db for the chrominance components respectively

Paper Details

Date Published: 22 March 2001
PDF: 10 pages
Proc. SPIE 4209, Multimedia Systems and Applications III, (22 March 2001); doi: 10.1117/12.420822
Show Author Affiliations
Christos Grecos, Univ. of Glamorgan (United Kingdom)
Jianmin Jiang, Univ. of Glamorgan (United Kingdom)


Published in SPIE Proceedings Vol. 4209:
Multimedia Systems and Applications III
Andrew G. Tescher; Bhaskaran Vasudev; V. Michael Bove, Editor(s)

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