how can change the angle of image ?

Question

M.aM 2012-7-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44676-how-can-change-the-angle-of-image

Hi everyone I have image I want change the angle of this image to be horizontal how can I do it? Thank you

Image example: http://up.arab-x.com/Apr12/Yen90992.jpg

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Thomas 2012-7-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44676-how-can-change-the-angle-of-image#answer_54757

在 MATLAB Online 中打开

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)

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Image Analyst 2012-7-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44676-how-can-change-the-angle-of-image#answer_54751

Perhaps imrotate() or imtransform()?

2 个评论
显示无隐藏无

M.aM 2012-7-27

Yep I used this but what if I want rote the image with out known the angle Thanks Image Analyst :)

Ryan 2012-7-27

编辑：Ryan 2012-7-27

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.

请先登录，再进行评论。