Abstract

In wavelet domain, if a wavelet coefficient is insignificant, the spatially related wavelet coefficients taken from all the successively higher frequency subbands of the same orientation are likely to be insignificant. This chapter will present quad-tree based adaptive wavelet packet transform in conjunction with the above-mentioned rearrangement scheme to generate adaptive wavelet packet trees (AWPT). We particularly combine SPIHT with AWPT, which is named set partitioning in adaptive wavelet packet trees (SPIAWPT), for image compression.

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