matlab图像处理函数总结.pdfVIP

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*);

sbplot(121);

imshow(I);

title(O-»dSIEI^in)

sbplot(122);

BW=dither(I);

imshow(BW);

a,

title(x»»06pASItOp2^In*)

12

4.滑动邻域操作

I=imread(*nan.pgm);//格必须为.pgm,即二值图像

£=@(x)max(x(:));

I2=nlfilter(I,[3,3],f);

figure,

subplot(121);imshow(I);subplot(122);imshow(12);

5.分禽块操作

I=imread(*nan.pgm);

f=@(x)uint8(round(mean2(x)*ones(size(x))));

I2=blkproc(工，[8,8],f);

figure

subplot(121);imshow(I);subplot(122);imshow(12);

6.图像插值

I=imread(*nan.pgm);

[m,n]=size(I);

x=l:n;y=l:m;[xy]=meshgrid(xy);

zz

xl=l:4:n;yl=l:4:m;[xl,yl]=meshgrid(xl,yl);

Il=interp2(x,y,I,xl,yl,nearest);

figure,

subplot(121),imshow(I);subplot(122),imshow(II);

7.图像缩放

I=imread(*nan.pgm*);

[m,n]=size(I);

Jl=imresize(1,0.08);

J2=imresize(1,8,nearest*);

J3=imre3ize(I,[18*m18*n],bilinear);

figure,

subplot(221),imshow(I);subplot(222)imshow(JI);

z

subplot(223),imshow(J2);subplot(224),imshow(J3);

8.图像交互剪裁

I=imread(nan.pgm);

figure,imshow(I)

I0=imcrop;

figure,imshow(10);

9.图像参数剪裁

I=imread(*nan.pgm)；

I2=imcrop(I,[150160150150]);

imshow(I),figure,imshow(12)

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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