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Low complexity sub-band image coding with pseudo QMF and pyramidal lattice VQ

Low complexity sub-band image coding with pseudo QMF and pyramidal lattice VQ

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A low complexity codec with no visible degradation is desirable in compression of digital images. The authors present a codec which combines the efficiency and effectiveness of both sub-band coding and lattice quantisation. Initially, a cosine modulated pseudoquadrature mirror filter is designed to decompose the input image into a number of sub-bands. The lowest frequency sub-band is DPCM encoded. All the higher frequency bands are vector quantised using a pyramidal piecewise uniform lattice quantisation. The proposed method was implemented and the computer simulation results are presented.

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