A study on the improvement of wavelet packet algorithm for image compression

In this paper, the base selection algorithm, which improves the performance of the coding gains and computational complexity, is proposed. The resolved threshold value restrict the computational complexity and the proposed algorithm decompose the child subband with the top-down tree search and the relative energy between the parent and child subband. The object of this paper is the performance of wavelet packet transform and optimization of quantisers or coders is not considered. For the present experiments, we used the quadtree coder scheme and showed the bit-rate, peak signal-to-noise ratio (PSNR) distortion measure, and the reconstructed image. Compared to discrete wavelet transform, PSNR improvements up to 1.1 dB are achieved for a set of standard test images.