how can change the angle of image ?
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Hi everyone I have image I want change the angle of this image to be horizontal how can I do it? Thank you
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Answers (2)
Thomas
on 27 Jul 2012
something like this? Based on the method shown here: http://stackoverflow.com/questions/5770818/how-to-align-image-matlab
I = imread('http://up.arab-x.com/Apr12/Yen90992.jpg');
%# egde detection
BW = edge(rgb2gray(I), 'canny');
%# hough transform
[H T R] = hough(BW);
P = houghpeaks(H, 4, 'threshold',ceil(0.75*max(H(:))));
lines = houghlines(BW, T, R, P);
out = imrotate(I,lines(1).theta);
subplot(121)
imshow(I)
subplot(122)
imshow(out)
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Image Analyst
on 27 Jul 2012
Perhaps imrotate() or imtransform()?
2 Comments
Ryan
on 27 Jul 2012
Edited: Ryan
on 27 Jul 2012
I would tackle it with this strategy:
- Find the top-most black pixel (in this case your upper left corner).
- Find the right-most black pixel (in this case your upper right corner).
- Use the change in width and height, along with trig to find the angle of rotation (it's like a triangle)
This strategy can be adapted to handle rotation the other way as well, but will not work past an 89 degree rotation in either direction.
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