matlab考试电子

参考代码中实现了彩色图像的灰度化、旋转、缩放两种几何变换以及镜像及拼接。Image1=imread('peppers.jpg');

%红绿通道互换

Image2=Image1;

Image2(:,:,1)=Image1(:,:,2);

Image2(:,:,2)=Image1(:,:,1);

imshow(Image2);

imwrite(Image2,'changecolor.jpg');

%灰度化

gray=rgb2gray(Image1); figure；

subplot(121),imshow(Image1),title('Original Image');

subplot(122),imshow(gray),title('Gray Image');

imwrite(gray,'grayimage.jpg');

% 图 像 旋 转

Newgray1=imrotate(gray,15); Newgray2=imrotate(gray,15,'bilinear'); figure;

subplot(121),imshow(Newgray1),title('旋转15°（最邻近插值）');

subplot(122),imshow(Newgray2),title('旋转15°（双线性插值）');

imwrite(Newgray1,'rotate1.jpg');

imwrite(Newgray2,'rotate2.jpg');

%图像缩放

Newgray3=imresize(gray,2.5,'nearest');

Newgray4=imresize(gray,2.5,'bilinear'); figure;

subplot(121),imshow(Newgray3),title('放大2.5倍（最邻近插值）'); subplot(122),imshow(Newgray4),title('放大2.5倍（双线性插值）');

imwrite(Newgray3,'scale1.jpg');

imwrite(Newgray4,'scale2.jpg');

%图像镜像与拼接

Image2=imread('lotus.bmp');

HImage=flipdim(Image2,2);

VImage=flipdim(Image2,1);

CImage=flipdim(HImage,1); [h w]=size(Image2);

NewImage=zeros(h*2,w*2,3);

NewImage=[Image2 HImage;VImage CImage];

figure,imshow(NewImage); imwrite(NewImage,'newlotus.jpg');