readme.m

这是伯克里wavelet transforms一书中的例子的代码

%This is a contents file that lists the routines and gives a brief 
%description of each. For a more detailed description please refer to 
%the help information in the relevant file using the help command in 
%MATLAB. For example for more information on 'meyer' type 
%'help meyer' at the MATLAB prompt.
%
%This floppy also contains an image, 'barbara.BMP' and a 'WAV' file,
%'dtmf.WAV'. 
% 
%1. scalwav - Generates the scaling function and the corresponding wavelet 
%             given the coefficients of the lowpass filter of an orthonormal
%             perfect reconstruction filter bank.
%
%2. biscwav - Generates the biorthogonal scaling function and 
%             wavelet corresponding to a biorthogonal filter bank.
%
%3. meyer   - Generates Meyer type scaling function and wavelet. 
%
%4. ctwt    - Routine to compute the scalogram of the input sequence. This
%             routine offers a choice of three wavelets (Haar, Mexican hat
%             and Morlet) to compute the scalogram.
%
%5a. anal   - Computes a multilevel DWT of the input sequence using an 
%              orthonormal filter bank. 
%
%5b. synth  - The synthesis or IDWT function corresponding to anal
%             function using orthonormal synthesis filter banks.
%
%6a. anal2d - Computes a 2-D separable multilevel DWT of a given 2-D 
%             array using separable orthonormal filter banks.
%
%6b. synth2d - The synthesis or the IDWT function corresponding to 
%              anal2d function. Uses orthonormal synthesis filter banks.
%
%7a. analw  - Computes the multilevel DWT of the of the input sequence 
%              using odd length/whole sample symmetric (WSS) biorthogonal
%              filter bank.
%
%7b. synthw  - The synthesis or the IDWT function corresponding to analw
%             function. Uses WSS biorthogonal filter banks.
%
%8a. analw2d - Computes a 2-D separable multilevel DWT of a given 2-D
%              array using separable WSS biorthogonal filter bank.
%
%8b. syntw2d - The synthesis or the IDWT function corresponding to 
%              analw2d. Uses WSS biorthogonal filter banks.
%
%9a. analh  - Computes the multilevel DWT of the of the input sequence 
%              using even length/half sample symmetric (HSS) biorthogonal
%              filter bank.
%
%9b. synthh - The synthesis or the IDWT function corresponding to analh
%             function. Uses HSS biorthogonal filter banks.
%
%10a. analh2d - Computes a 2-D separable multilevel DWT of a given 2-D
%               array using separable HSS biorthogonal filter bank.
%
%10b. synthh2d - The synthesis or the IDWT function corresponding to 
%                analw2d. Uses HSS biorthogonal filter banks.
%
%11a.  wpanal  - Computes the wavelet packet decomposition of the input
%                 sequence using orthogonal filter banks.
%
%11b. wpsynth  - The wavelet packet synthesis routine corresponding to 
%                the routine, wpanal. Uses orthogonal filter banks.
%
%12. cwtex     - Continuous wavelet transform routine that computes the 
%                result of Example 1.1 in the book.
%
%.MAT files 
%d4, d6, d8, d10    - contain the coefficients of Daubechies filters of 
%                     length 4, 6, 8 and 10, respectively.
%
%fal, fah, fsl, fsh - contain the coefficients of the 'FBI' analysis
%                     lowpass and highpass, and, lowpass and highpass
%                     synthesis filters respectively.
%
%al, ah, sl, sh     - contain the coefficients of the 2/6 biorthogonal
%                     analysis lowpass and, highpass and, synthesis 
%                     lowpass and highpass filters respectively.
%
%al1, ah1, sl1, sh1 - contain the coefficients of 4/4 biorthogonal
%                     analysis lowpass and, highpass and, synthesis 
%                     lowpass and highpass filters respectively.     
%
%Authors: Ajit S. Bopardikar and Raghuveer M. Rao
%Copyright (c) 1998 by Addison Wesley Longman, Inc.
%