matlab图像处理二，图像缩放、旋转、修剪

• 图像的缩放
  A = imresize(I, scale).
  I:原图像
  scale:>1,放大；<1,缩小
  A：缩放后的图像

I=imread('C:\Users\14372\Desktop\Music_pictures\图片\63567947_p0.jpg');
A=imresize(I,0.5);

figure;
imshow(I);title('原图');
figure;
imshow(A);title('缩小0.5倍');

• 图像的旋转
  A=imrotate(I,angle);
  I:原图像
  angle:逆时针旋转的角度
  A：旋转后的图像

I=imread('C:\Users\14372\Desktop\Music_pictures\图片\63567947_p0.jpg');
A=imrotate(I,15);

figure;
subplot(1,2,1);imshow(I);title('原图');
subplot(1,2,2);imshow(A);title('逆时针旋转15°');

• 图像的修剪

https://blog.youkuaiyun.com/justforacm/article/details/80664025

I=imread('C:\Users\14372\Desktop\Music_pictures\图片\63567947_p0.jpg');
A=imcrop(I,[200,200,400,200 ]);

figure;
subplot(1,2,1);imshow(I);title('原图');
subplot(1,2,2);imshow(A);title('裁剪图');