How to rotate an image in Matlab
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For my class project I have to create an app which loads an image and allows you to change Red, blue, green colors and the brightness. I have sucessfully coded this app. Now I have to add a button which would allow me to rotate the image 90 degrees each time. The requirements is that I do not use any pre existing matlab functions, but have to create my own.
Would greatly appreciate any help on this. Thank you.
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Answers (4)
J Chen
on 4 May 2022
You basically read the image into a matrix, then change the array element to a different location (swich row to column, etc.)
yanqi liu
on 7 May 2022
yes,sir,may be rot90,such as
im = imread('football.jpg');
for i = 1 : 4
im = rot90(im, 1);
figure; imshow(im, []);
end
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Image Analyst
on 7 May 2022
Edited: Image Analyst
on 7 May 2022
You can use the apostrophe operator '
yourImage = yourImage';
This transposes the matrix. To now get a mirror image you have to swap rows or columns.
You can use the rotation matrix: https://en.wikipedia.org/wiki/Rotation_matrix
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