7 May 2003 Modified fixed-length entropy coding for robust video compression
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Abstract
This paper proposes a modified Fixed-length Entropy Coding(FLC) algorithm suitable for MPEG-like hybrid-based video compression. In such applications, the alphabets of symbols sending to entropy coding are of heavy-tail distributions. Previously proposed algorithms either have poor compression efficiency or are computationally complex in this situation. The technique proposed in this paper extends the previous work for the important case of large alphabets by introducing a new alphabet segmentation and splitting algorithm. Simulation results show that for sources with relative large, skewed and heavy-tail distributed alphabets, the proposed approach has faster alphabet shrinking and higher compression efficiency compared with previous FLC approaches. A hybrid video codec using the proposed FLC is implemented and compared to a MPEG-2 video codec in both noise-free and noisy environments. The results demonstrate that the proposed FLC has similar compression gain as common VLC, and FLC codes provide more robustness to video streams than VLC codes. The proposed technique can be used to compress video sequences transmitted over channels with random bit errors.
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Guanjun Zhang, Guanjun Zhang, Robert L. Stevenson, Robert L. Stevenson, } "Modified fixed-length entropy coding for robust video compression", Proc. SPIE 5022, Image and Video Communications and Processing 2003, (7 May 2003); doi: 10.1117/12.476612; https://doi.org/10.1117/12.476612
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