On Video SNR Scalability
نویسندگان
چکیده
In this paper, we compare two SNR scalable video codecs. The rst codec (CODEC1) is a three-layer single-pass quantization algorithm based on H.263 and extends the work presented in [1, 2]. The second codec (CODEC2) implements three layer SNR scalability as described in Annex O of the H.263 standard by requantizing the DCT coe cients of the encoding error using ner quantizers than those used in the previous layer. By testing the two algorithms at various base and enhancement layer rates on both high and low motion sequences, the advantages and disadvantages of each codec are discussed and suitable applications are suggested for each one.
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