Advanced packet-video coding based on layered VQ and SBC techniques

The performances of two subband-coding-vector-quantization (SBC-VQ) schemes (a quadrature-mirror-filter-based SBC with trained-codebook VQ and a parallel-filterbank SBC with lattice VQ) are compared to that of a DCT-SQ (discrete-cosine-transform-scalar-quantization) scheme as it is used in present image-coding standards. Two-layer versions of these spatial coders are evaluated in a hybrid combination with motion-compensation prediction for interframe data compression. As the SBC scheme with lattice VQ is found to perform the best, this coding scheme is further investigated in combination with more sophisticated interframe-data-compression schemes. The motion-compensated 3-D SBC coder with lattice VQ was found to outperform the techniques used in current standard coders by several dBs in the compression of interlaced CCIR 601 sequences. The performance of this coder is extremely robust in the presence of asynchronous transfer mode (ATM) cell losses due to the nonrecursive decoder structure.<
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