小波变换用于图像增强、去噪

低频体现轮廓，高频体现细节

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clc,clear all,close all; I=imread('C:\Users\Jv\Desktop\wenli2.jpg'); gray=rgb2gray(I); X=double(gray); % load woman; %单尺度二维离散小波分解。分解小波函数haar [cA,cH,cV,cD]=dwt2(X,'haar'); %单尺度二维离散小波重构(逆变换)，升低频降高频 Y=idwt2(1.2*cA,0.6*cH,0.6*cV,0.6*cD,'haar'); figure; subplot(1,2,1),imshow(uint8(X)),title('原始图像'); subplot(1,2,2),imshow(uint8(Y)),title('增强图像');