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

Vector Quantization (VQ) and Subband Coding (SBC) are promising candidates for future generations of image coders : VQ is known to outperform scalar quantization (SQ) techniques, SBC overcomes the block structure problem of DCT transform coders and has better energy compaction properties. The paper compares the performances of two SBC-VQ schemes (a QMF-based SBC with trained-codebook VQ and a parallel filterbank SBC with Lattice VQ) to that of a DCT-SQ scheme as it is used in present image coding standards. 2layer versions of these spatial coders were evaluated in a hybrid combination with Motion Compensation Prediction for interframe data compression. As the SBC scheme with LatticeVQ was found to perform best, this coding scheme was further investigated in combination with more sophisticated interframe data compression schemes. The motion compensated 3dimensional SBC coder with Lattice VQ was found to outperform the techniques used in nowaday 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 ATM cell losses due to the non-recursive decoder structure. 1Correspondence address : Dr.-Ing. Jens-Rainer Ohm Technische Universität Berlin Institut für Fernmeldetechnik, Sekretariat FT 5 Einsteinufer 25, W-1000 Berlin 10, Germany Phone : +49-30-314-26800 Fax : +49-30-314-25799 E-mail : [email protected] J.-R. Ohm : Advanced Packet Video Coding Based on Layered VQ and SBC Techniques -2