22 March 1996 Performance comparison of loop filtering in generic MC/DPCM/DCT video coding
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Abstract
This paper presents a performance comparison of different loop filtering techniques in a generic hybrid video coding algorithm. This study will compare the performance of the filtering techniques by integrating each of the loop filters separately into a MPEG-1 compliant codec, and coding a number of video sequences at various bit-rates and motion compensation (MC) accuracies. The performance of the filters will be assessed in terms of the energy of the displaced frame difference. Comparisons are conducted between four filtering techniques: (1) the 1:2:1 loop filter described in ITU Recommendation H.261; (2) an MC-accuracy dependent 3-tap filter, whose tap weights are based upon a first-order Markov model of the source; (3) a spatially-adaptive filter for the blocking-effect based on the theory of Projections Onto Convex Sets (POCS); and (4) an anisotropic filter for the reduction of the blocking-effect. Our results will examine the effect that traditional low-pass loop filters have on MC prediction quality, and compare this to a POCS-based loop filter. The filtering of only the blocking-effect will also provide an indication of the contribution that the blocking-effect has on the overall high- frequency distortions that are reduced by the low-pass loop filters.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Yuen, Hong Ren Wu, "Performance comparison of loop filtering in generic MC/DPCM/DCT video coding", Proc. SPIE 2668, Digital Video Compression: Algorithms and Technologies 1996, (22 March 1996); doi: 10.1117/12.235441; https://doi.org/10.1117/12.235441
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