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29 June 2000 Video compression based on enhanced EZW scheme and Karhunen-Loeve transform
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The paper presents a new method for video compression based on the enhanced embedded zerotree wavelet (EZW) scheme. Recently, video codecs from the EZW family which use a 3D version of EZW or SPIHT algorithms showed better performance than the MPEG-2 compression algorithm. These algorithms have many advantages inherent for wavelet based schemes and EZW- like coders. Their most important advantages are good compression performance and scalability. However, they still allow improvement in several ways. First, as we recently showed, using Karhunen-Loeve (KL) transform instead of wavelet transform along the time axis improves compression ratio. Second, instead of the 3D EZW quantization scheme, we offer to use a convenient 2D quantization for every decorrelated frame adding one symbol `Strong Zero Tree', which means that every frame from a chosen set has a zero tree in the same location. The suggested compression algorithm based on KL transform, wavelet transform, and a new quantization scheme with strong zerotrees is free from some drawbacks of the plain 3D EZW codec. The presented codec shows 1 - 6 dB better results compared to the MPEG-2 compression algorithm on video sequences with small and medium motion.
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Olexandr M. Soloveyko, Yurij S. Musatenko, Vitalij N. Kurashov, and Vladislav A. Dubikovskiy "Video compression based on enhanced EZW scheme and Karhunen-Loeve transform", Proc. SPIE 4041, Visual Information Processing IX, (29 June 2000);

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