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1、彩色图像转灰度图像L=imread('i:1.jpg')L=double(L);Xrgb=0.2990*L(:,:,1)+0.5870*L(:,:,2)+0.1140*L(:,:,3);NbColors=255;X=wcodemat(Xrgb,NbColors);map1=gray(NbColors);image(X);colormap(map1);title('原图像的灰度图');小波压缩-低频信息保留压缩方式L=imread('i:1.jpg')L=double(L);Xrgb=0.2990*L(:,:,1)+0.5870*L(:,:,2)+0.
2、1140*L(:,:,3);NbColors=255;X=wcodemat(Xrgb,NbColors);map1=gray(NbColors);image(X);colormap(map1);title('原图像的灰度图');axissquare;disp('灰度图像X的大小');whos('X')[c,s]=wavedec2(X,2,'bior3.7');ca1=appcoef2(c,s,'bior3.7',1);ch1=detcoef2('h',c,s,1);%水平方向cv1=detcoef2('v',c,s,1);%垂直方向cd1=detcoef
3、2('d',c,s,1);%斜线方向a1=wrcoef2('a',c,s,'bior3.7',1);h1=wrcoef2('h',c,s,'bior3.7',1);v1=wrcoef2('v',c,s,'bior3.7',1);d1=wrcoef2('d',c,s,'bior3.7',1);%各频率成分重构c1=[a1,h1;v1,d1];image(c1);colormap(gray);axissquare;title('分解后低频和高频信息');ca1=appcoef2(c,s,'bior3.7',1);ca1=wcodemat(ca1,440,'m
4、at',0);ca1=0.5*ca1;disp('第一次压缩后图像的大小为：');image(ca1);colormap(gray);%colormap(map);axissquare;title('第一次压缩图像');whos('ca1')ca2=appcoef2(c,s,'bior3.7',2);ca2=0.25*ca2;image(ca2);colormap(gray);%colormap(map);axissquare;title('第二次压缩图像');disp('第二次压缩后图像大小为：');whos('ca2')灰度图像X的大小NameSiz
5、eBytesClassX150x125150000doublearrayGrandtotalis18750elementsusing150000bytes第一次压缩后图像的大小为：NameSizeBytesClassca182x7045920doublearrayGrandtotalis5740elementsusing45920bytes第二次压缩后图像大小为：NameSizeBytesClassca248x4216128doublearrayGrandtotalis2016elementsusing16128bytes二维小波压缩H=imread('
6、i:1.jpg')H=double(H);Grgb=0.2990*H(:,:,1)+0.5870*H(:,:,2)+0.1140*H(:,:,3);NbColors=255;G=wcodemat(Grgb,NbColors);map2=gray(NbColors);figure(4);image(G);colormap(map2);title('原图像的灰度图');%转换成为灰度级索引图像[CA1,CH1,CV1,CD1]=dwt2(G,'bior3.7');%从分解系数中提取近似和细节[CA1,CH1,CV1,CD1]=dwt2(G,'bior3.7
7、');A1=upcoef2('a',CA1,'bior3.7',1);H1=upcoef2('h',CH1,'bior3.7',1);V1=upcoef2('v',CV1,'bior3.7',1);D1=upcoef2('d',CD1,'bior3.7',1);%显示近似和细节%figure('name','近似分量A1');colormap(map2);subplot(2,2,1);image(wcodemat(A1,192));title('近似A1');subplot(2,2,2);image(wcodemat(H1,192));title('水平
8、细节H1');subplot(2,2,3);image(wcodemat(V1,
