一般的9-7小波滤波器及其图像压缩性能研究

摘要

通过构造一个包含Cohen和Daubechies等人的著名9-7小波滤波器(CDF97)的超小波滤波器族，获得了新的9-7小波滤波器，它们不仅有很好的压缩性能，也有很好的计算性能，有利于ASIC的设计。试验结果表明，新的小波滤波器几乎具有CDF97的客观压缩性能，并且能保留更多的图像细节。因此，在标准化图像压缩系统中，本文的滤波器是CDF97理想的替代者。%This paper constructs a class of 9-7-tap wavelets filters, in which the famous 9-7-tap wavelet (CDF97) of Cohen andDaubechies is contained. New wavelets filters obtained from the class not only have excellent compression performances but also easycomputation and are very suitable for design of ASIC. The test results for compression performances have shown that new filters aregood almost as CDF97 under PSNR and can save more details. Therefore, the filters constructed in this paper are ideal replacement ofCDF97 in standardized image compression systems based on wavelets.