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Image Compression Using Zerotree and multi-Stage Vector Quantization
Washington, DC October 26-October 29
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/ICIP.1997.6388451997 International Conference on Imag ...
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Embedded zerotree of wavelet coefficient (EZW) algorithm has become an effective way of compressing images. The use of multistage vector quantizer (MSVQ) provides successive-approximation coding for vectors. A new algorithm is proposed that provides good quality of reconstructed images at very low bit rates. The algorithm uses successive-approximation quantization of both scalars and vectors on wavelet coefficients of the image. Successive-approximation quantization of scalars and vectors is done using EZW and MSVQ algorithms respectively. EZ W algorithm is applied to wavelet coefficients belonging to coarser level subbands and MSVQ is applied to vectors of wavelet coefficients belonging to finer level subbands. The pro-posed method further uses static Huffman coding to achieve more compression.
Citation:
J. Karlekar, P. Poonacha, U. Desai, "Image Compression Using Zerotree and multi-Stage Vector Quantization," icip, vol. 2, pp.610, 1997 International Conference on Image Processing (ICIP'97) - Volume 2, 1997
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