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Plot image in 2d plain and apply operations like translation/rotation and reflection

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Farhan
Farhan 2023-12-8
编辑： Matt J 2023-12-8
I want to read an image on matlab and on 2d plain perform changes of its coordinates as I would have done on a graph
img = imread('img.png');
sz = size(img);
imshow(img);
I am very new to matlab and do not understand much too. I know that imread will get 3d matrix. First 2 with original values
and the last for RGB.
Those are color values and I do not thin that can be used to apply rotation or translation
Below is the example oof what I actually want to do.

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回答（2 个）

Matt J
Matt J 2023-12-8
编辑：Matt J 2023-12-8
  4 个评论
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Matt J
Matt J 2023-12-8
编辑：Matt J 2023-12-8
Ran in:
rgbImage = imread('peppers.png');
T = [0.6428 -0.7660 0
0.7660 0.6428 0
0 0 1.0000 ]; %transformation matrix
tform=simtform2d(T);
imshow(imwarp(rgbImage,tform))

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Image Analyst
Image Analyst 2023-12-8
编辑：Image Analyst 2023-12-8
Ran in:
rgbImage = imread('peppers.png');
title('Original')
nexttile
imshow(rgbImage);
img2 = imrotate(rgbImage, 90);
title('Rotated')
nexttile
imshow(img2);
img3 = flipud(rgbImage);
nexttile
imshow(img3);
title('Flipped top-to-bottom about horizontal axis')
For more sophisticated transforms, see Steve's blog:
Spatial transformations Defining and applying custom transforms Steve on Image Processing

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