www.gusucode.com > wavelet 源码程序 matlab案例代码 > wavelet/DWT2DOfImageExample.m

    %% 2-D DWT of Image
% This example shows how to obtain the 2-D DWT of an image. 
%%
% Load the "woman" image and obtain the 2-D DWT using the 'sym4' wavelet. 
% Use the periodic extension mode.

% Copyright 2015 The MathWorks, Inc.

load woman;
wname = 'sym4';
[CA,CH,CV,CD] = dwt2(X,wname,'mode','per');
%%
% Display the vertical detail image and the lowpass approximation.
subplot(211)
imagesc(CV); title('Vertical Detail Image');
colormap gray;
subplot(212)
imagesc(CA); title('Lowpass Approximation');