1.將圖像二值化I=imread('nan.jpg');BW=im2bw(I,0.2);//必須在0-1之間imshow(BW)2.灰度圖像保存文件名必須為.pgm3.將灰度圖像轉換為二值圖像I=imread('nan.pgm');subplot(121);imshow(I);title('?-?ò?èí???')subplot(122);BW=dither(I);imshow(BW);title('×a??oóμ??t?μí???')4.滑動鄰域操作I=imread('nan.pgm');//格式必須為.pgm，即二值圖像f=@(x)max(x(:));I2=nlfilter(I,[3,3],f);figure,subplot(121);imshow(I);subplot(122);imshow(I2);5.分離塊操作I=imread('nan.pgm');f=@(x)uint8(round(mean2(x)*ones(size(x))));I2=blkproc(I,[8,8],f);figuresubplot(121);imshow(I);subplot(122);imshow(I2);6.圖像插值I=imread('nan.pgm');[m,n]=size(I);x=1:n;y=1:m;[x,y]=meshgrid(x,y);x1=1:4:n;y1=1:4:m;[x1,y1]=meshgrid(x1,y1);I1=interp2(x,y,I,x1,y1,'nearest');figure,subplot(121),imshow(I);subplot(122),imshow(I1);7.圖像縮放I=imread('nan.pgm');[m,n]=size(I);J1=imresize(I,0.08);J2=imresize(I,8,'nearest');J3=imresize(I,[18*m18*n],'bilinear');figure,subplot(221),imshow(I);subplot(222),imshow(J1);subplot(223),imshow(J2);subplot(224),imshow(J3);8.圖像交互式剪裁I=imread('nan.pgm');figure,imshow(I)I0=imcrop;figure,imshow(I0);9.圖像參數式剪裁I=imread('nan.pgm');I2=imcrop(I,[150160150150]);imshow(I),figure,imshow(I2)10.離散余弦變換RGB=imread('nannan.jpg');I=rgb2gray(RGB);J=dct2(I);imshow(log(abs(J)),[])colormap(jet(64)),colorbarfigure;J(abs(J)<10)=0;K=idct2(J)/50;imshow(K)11.余弦變換壓縮I=imread('nan.pgm');I=im2double(I);T=dctmtx(8);B=blkproc(I,[88],'P1*x*P2',T,T);mask=[1111100011110000111000001100000010000000000000000000000000000000];B2=blkproc(B,[88],'P1.*x',mask);I2=blkproc(B2,[88],'P1*x*P2',T',T);imshow(I)figure;imshow(I2)12.小波變換壓縮I=imread('nan.pgm');subplot(221);image(I);colormap(map)title('?-ê?í???');axissquaredisp('?1???°í???Xμ?′óD?');whos('I')[c,s]=wavedec2(I,2,'bior3.7');cal=appcoef2(c,s,'bior3.7',1);ch1=detcoef2('h',c,s,1);cv1=detcoef2('v',c,s,1);cd1=detcoef2('d',c,s,1);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);c1=[a1,h1;v1,d1];subplot(222);image(c1);axissquare;title('·??aoóμí?μoí???μD??￠');ca1=appcoef2(c,s,'bior3.7',1);ca1=wcodemat(ca1,440,'mat',0);ca1=0.5*ca1;subplot(223);image(ca1);colormap(map);axissquare;title('μúò?′??1??í???');disp('μúò?′??1??í???μ?′óD??a￡o');whos('ca1')ca2=appcoef2(c,s,'bior3.7',2);ca2=wcodemat(ca2,440,'mat',0);ca2=0.25*ca2;subplot(224);image(ca2);colormap(map);axissquare;title('μú?t′??1??í???');disp('μú?t′??1??í???μ?′óD??a￡o');whos('ca2')壓縮前圖像I的大小NameSizeBytesClassAttributesI539x551296989uint8第一次壓縮圖像的大小為：NameSizeBytesClassAttributesca1277x283627128double第二次壓縮圖像的大小為：NameSizeBytesClassAttributesca2146x149174032double13.小波壓縮圖像A=imread('mengnan.png');A=double(A);Xrgb=0.2990*A(:,:,1)+0.5870*A(:,:,2)+0.1140*A(:,:,3);Nbcolor=255;X=wcodemat(Xrgb,Nbcolor);map=pink(Nbcolor);image(X);whos('A')whos('X');colormap(map);colorbar;NameSizeBytesClassAttributesA901x1201x325970424doubleNameSizeBytesClassAttributesX901x12018656808double14.圖像縮放A=imread('nannan.jpg');B=imresize(A,0.5,'nearest');figure,imshow(A);title('?-í???');figure,imshow(B);title('í?????·?');whos('A');whos('B');NameSizeBytesClass