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小波分解与重构

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function [ output_args ] = Untitled9( input_args )

%UNTITLED9 Summary of this function goes here

% Detailed explanation goes here

f=imread('lena.bmp');

imshow(f);

[X, map] = gray2ind(f, 256);%将灰度图像转换为索引图像imview(X, map);

nbcol=size(map,1);

[cA1,cH1,cV1,cD1]=dwt2(X,'db1');

cod_X=wcodemat(X,nbcol);

cod_cA1=wcodemat(cA1,nbcol);

cod_cH1=wcodemat(cH1,nbcol);

cod_cV1=wcodemat(cV1,nbcol);

cod_cD1=wcodemat(cD1,nbcol);

figure

subplot(221)

imshow(cod_cA1,map)

title('近似细节系数')

subplot(222)

imshow(cod_cH1,map)

title('水平细节系数')

subplot(223)

imshow(cod_cV1,map)

title('垂直细节系数')

subplot(224)

imshow(cod_cD1,map)

title('对角细节系数')

Y=idwt2(cA1,cH1,cV1,cD1,'db1',nbcol);

figure;

imshow(Y,map);

title('重构后的图像')

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