matlab 图像的几何变换

（1）平移：

I = imread('apostles.jpg');
I = double(I);
B = zeros(size(I));
H = size(I);
move_x = 100;
move_y = 150;
B(move_y + 1:H(1), move_x+1:H(2), 1:H(3))=...
I(1:H(1)-move_y, 1:H(2) - move_x, 1:H(3));
subplot(1,2,1),subimage(uint8(I))
title('原图像')
subplot(1,2,2),subimage(uint8(B))
title('平移变换');

I = imread('apostles.jpg');
se=translate(strel(1),[150 100]);
B = imdilate(I,se);
figure;
subplot(1,2,1),subimage(I);
title('原图像');
subplot(1,2,2),subimage(B);
title('平移变换');

（2）镜像：

I = imread('apostles.jpg');
[height, width, dim]=size(I);
%水平镜像变换
tform = maketform('affine',[-1 0 0;0 1 0; width 0 1]);
B=imtransform(I, tform, 'nearest');
%垂直镜像变换
tform2 = maketform('affine', [1 0 0; 0 -1 0; 0 height 1]);
C=imtransform(I, tform2, 'nearest');
subplot(1,3,1),imshow(I);
title('原图像');
subplot(1,3,2),imshow(B);
title('水平图像');
subplot(1,3,3),imshow(C);
title('垂直图像');

A = imread('apostles.jpg');
A = double(A);
figure(1), imshow(uint8(A));
H = size(A);
figure(2),B(1:H(1),1:H(2),1:H(3))=A(H(1):-1:1,1:H(2),1:H(3));%垂直镜像
imshow(uint8(B));
figure(3),C(1:H(1),1:H(2),1:H(3))=A(1:H(1),H(2):-1:1,1:H(3));%水平镜像
imshow(uint8(C));

（3）转置：

I = imread('apostles.jpg');
tform = maketform('affine',[0 1 0; 1 0 0; 0 0 1]);%定义转置矩阵
B = imtransform(I, tform, 'nearest');
subplot(1,2,1),imshow(I)
title('原图像');
subplot(1,2,2),imshow(B)
title('转置图像');

（4）缩放：

I = imread('C:\apostles.jpg');
A = imresize(I, 1.5, 'nearest');%最近插值法
B = imresize(I, 1.5, 'bilinear');%双线性插值法
C = imresize(I, 1.5, 'bicubic');%二次立方插值法
subplot(2,2,1), imshow(I), title('original');
subplot(2,2,2), imshow(A), title('nearest');
subplot(2,2,3), imshow(B), title('bilinear');
subplot(2,2,4), imshow(C), title('bicubic');
A = imresize(I, [a b], 'nearest');%不同方向比例差值

（5）旋转：

I = imread('apostles.jpg');
A = imrotate(I, 30, 'nearest');%旋转30度,最邻近插值
figure(1),imshow(A)
B = imrotate(I, 45, 'bilinear','loose');%旋转45度，二次线性插值
figure(2),imshow(B)