matlab图像处理函数总结.doc

1.将图像二值化 I=imread(nan.jpg); BW=im2bw(I,0.2);//必须在0-1之间 imshow(BW) 2.灰度图像保存文件名必须为.pgm 3.将灰度图像转换为二值图像 I=imread(nan.pgm); subplot(121); imshow(I); title(?-?ò?èí???) subplot(122); BW=dither(I); imshow(BW); title(×a??oóμ??t?μí???) 4.滑动邻域操作 I=imread(nan.pgm);//格式必须为.pgm，即二值图像 f=@(x)max(x(:)); I2=nlfilter(I,[3,3],f); figure, subplot(121);imshow(I);subplot(122);imshow(I2); 5.分离块操作 I=imread(nan.pgm); f=@(x)uint8(round(mean2(x)*ones(size(x)))); I2=blkproc(I,[8,8],f); figure subplot(121);imshow(I);subplot(122);imshow(I2); 6.图像插值 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.图像缩放 I=imread(nan.pgm); [m,n]=size(I); J1=imresize(I,0.08); J2=imresize(I,8,nearest); J3=imresize(I,[18*m 18*n],bilinear); figure, subplot(221),imshow(I);subplot(222),imshow(J1); subplot(223),imshow(J2);subplot(224),imshow(J3); 8.图像交互式剪裁 I=imread(nan.pgm); figure,imshow(I) I0=imcrop; figure,imshow(I0); 9.图像参数式剪裁 I=imread(nan.pgm); I2=imcrop(I,[150 160 150 150]); imshow(I),figure,imshow(I2) 10.离散余弦变换 RGB=imread(nannan.jpg); I=rgb2gray(RGB); J=dct2(I); imshow(log(abs(J)),[]) colormap(jet(64)),colorbar figure; J(abs(J)10)=0; K=idct2(J)/50; imshow(K) 11.余弦变换压缩 I=imread(nan.pgm); I=im2double(I); T=dctmtx(8); B=blkproc(I,[8 8],P1*x*P2,T,T); mask=[1 1 1 1 1 0 0 0 1 1 1 1 0 0 0 0 1 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]; B2=blkproc(B,[8 8],P1.*x,mask); I2=blkproc(B2,[8 8],P1*x*P2,T,T); imshow(I) figure; imshow(I2) 12.小波变换压缩 I=imread(nan.pgm); subplot(221); image(I); colormap(map) title(?-ê?í???); axis square disp(?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=w