Patent ID: 6587589
Filing Date: 2003-07-01
Classification: G06F,H04N

Abstract:
An architecture adapted to performing the two-dimensional discrete wavelet transform for performing a multilevel decomposition operation to decompose an original image into a plurality of bands, comprising:a transform module for decomposing an input image into four bands, wherein among said four bands, a band having a low frequency in both horizontal and vertical directions serves as an input image for a next level decomposition operation, said transform module further comprising: a first stage having decimation filters for performing a horizontal filtering operation; and a second stage having decimation filters for performing a vertical filtering operation, wherein a coefficient folding technique is employed by said decimation filters of said second stage such that every two coefficients of said decimation filters of said second stage share one set of a multiplier, and adder and a register; and a multiplexer for selecting said band having the lowest frequency in both horizontal and vertical direction as the input image to feed into said transform module.