A simple parallel architecture for discrete wavelet transform

In this paper, we present a simple parallel architecture for Discrete Wavelet Transform (DWT). Efficient computation of the pyramid algorithm for the computing of the discrete wavelet transform is possible due to the similarity between computation results of each octave. By using similarity, we separated the filter into 2 parts, an even filter and an odd filter. 1 octave and other octave computation are performed in the even and odd filters at the same time. The proposed architecture has following features. (1) Critical path is 1 multiplier and 1 adder; (2) the number of required registers is 1+J*([L_h/2]-1)+1+J*([L₁/2]-1)+J, where J is the number of octaves, L_h is length of the highpass filter and L ₁ is length of the lowpass filter