文档介绍：图像读取及灰度变换I=imread('');%读取图像subplot(1,2,1),imshow(I)%输出图像title('原始图像')%在原始图像中加标题subplot(1,2,2),imhist(I)%输出原图直方图title('原始图像直方图')%在原图直方图上加标题图像旋转I=imread('');figure,imshow(I);theta=30;K=imrotate(I,theta);%Tryvaryingtheangle,,imshow(K)边缘检测I=imread('');J1=edge(I,'sobel');J2=edge(I,'prewitt');J3=edge(I,'log');subplot(1,4,1),imshow(I);subplot(1,4,2),imshow(J1);subplot(1,4,3),imshow(J2);subplot(1,4,4),imshow(J3);:I=imread('');J=double(I);J=-J+(256-1);                %图像反转线性变换H=uint8(J);subplot(1,2,1),imshow(I);subplot(1,2,2),imshow(H);:I=imread('');subplot(2,2,1),imshow(I);title('原始图像');axis([50,250,50,200]);axison;                 %显示坐标系I1=rgb2gray(I);subplot(2,2,2),imshow(I1);title('灰度图像');axis([50,250,50,200]);axison;                 %显示坐标系J=imadjust(I1,[],[]);%局部拉伸,把[]内的灰度拉伸为[01]subplot(2,2,3),imshow(J);title('线性变换图像[]');axis([50,250,50,200]);gridon;                 %显示网格线axison;                 %显示坐标系K=imadjust(I1,[],[]);%局部拉伸,把[]内的灰度拉伸为[01]subplot(2,2,4),imshow(K);title('线性变换图像[]');axis([50,250,50,200]);gridon;                 %显示网格线axison;                 %:I=imread('');I1=rgb2gray(I);subplot(1,2,1),imshow(I1);title('灰度图像');axis([50,250,50,200]);gridon;                 %显示网格线axison;                 %显示坐标系J=double(I1);J=40*(log(J+1));H=uint8(J);subplot(1,2,2),imshow(H);title('对数变换图像');axis([50,250,50,200]);gridon;                 %显示网格线axison;                 %:I=imread('');I=rgb2gray(I);figure;subplot(2,2,1);imshow(I);subplot(2,2,2);imhist(I);I1=histeq(I);figure;subplot(2,2,1);imshow(I1);subplot(2,2,2);imhist(I1);:I=imread('');subplot(231)imshow(I)title('原始图像')I=rgb2gray(I);I1=imnoise(I,'salt&pepper',);subplot(232)imshow(I1)title('添加椒盐噪声的图像')k1=filter2(fspecial('average',3),I1)/255;         %进行3*3模板平滑滤波k2=filter2(fspecial('a