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

Christos Grecos; Jianmin Jiang

doi:10.1117/12.420822

22 March 2001 Improved estimation of quantizer moderators in MPEG-2 rate control using a novel robust estimate and a family of exponential modulators

Christos Grecos, Jianmin Jiang

Author Affiliations +

Proceedings Volume 4209, Multimedia Systems and Applications III; (2001) https://doi.org/10.1117/12.420822
Event: Information Technologies 2000, 2000, Boston, MA, United States

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

Citation Download Citation

Christos Grecos and Jianmin Jiang "Improved estimation of quantizer moderators in MPEG-2 rate control using a novel robust estimate and a family of exponential modulators", Proc. SPIE 4209, Multimedia Systems and Applications III, (22 March 2001); https://doi.org/10.1117/12.420822

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