cdf_9x7.wvf

小波压缩编码平台软件包

%CDF_9x7 (Cohen-Daubechies-Feauveau wavelet)
%
%This biorthogonal wavelet filter bank is designed as a spline
% variant with less dissimilar lengths.  Originally published by
% Cohen et al., this filter bank has seen widespread use in
% image-processing applications. Initially used by Antonini, et al.
%
%Different variants appear, with different signs and/or scaling, the 
% most common one is where the low-pass filter coefficients are divided 
% by sqrt(2) while the high-pass are multiplied by the same factor. The
% one provided here ensures that DC and Nyquist gain are sqrt(2). 
% Be aware of that when comparing to other sources!
%
%References:
%
%A. Cohen, I. Daubechies, J. C. Feauveau,
% "Biorthogonal Bases of Compactly Supported Wavelets", 
% Communications on Pure and Applied Mathematics, vol. 45, no. 5, pp. 485-560, May 1992.
%
%M. Antonini, M. Barlaud, P. Mathieu, I. Daubechies,
% "Image Coding Using Wavelet Transform", 
% IEEE Transactions on Image Processing, vol. 1, no. 2, pp. 205-220, April 1992.

%wvf_type
 SYMMETRIC_ODD
%lift_coeff
-1.586134342
-0.052980118
 0.882911075
 0.443506852 
%lift_cnct
 11
 11
 11
 11
%lift_norm
 1.149604398
 0.869864452
%filt_AL - symmetric
-4, 0.03782845550726
-3,-0.02384946501956
-2,-0.11062440441844
-1, 0.37740285561283
 0, 0.85269867900889
 1, 0.37740285561283
 2,-0.11062440441844
 3,-0.02384946501956
 4, 0.03782845550726
%filt_AH - symmetric
-3, 0.06453888262870
-2,-0.04068941760916
-1,-0.41809227322162
 0, 0.78848561640558
 1,-0.41809227322162
 2,-0.04068941760916
 3, 0.06453888262870
%filt_SL - can be deduced from filt_AH
%filt_SH - can be deduced from filt_AL