Matlab equivalent of python code to rotate an image
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Marcel345614
il 27 Gen 2022
Commentato: Marcel345614
il 31 Gen 2022
What is the matlab equivalent for the following python code:
image = cv2.flip(imgage, 1)
row,col = image.shape
center=tuple(np.array([row,col])/2)
rot_mat = cv2.getRotationMatrix2D(center,-130,1.0)
image = cv2.warpAffine(image, rot_mat, (col,row))
new_image=cv2.warpPerspective(imgage, other_matrix, (row, col), cv2.INTER_NEAREST)
I already have,
image=flipdim(image ,1); % is this correct??
rot_cen=[size(image,1)/2, size(image,2)/2];
rot_ang=deg2rad(-130);
rot_mat=affine2d([cos(rot_ang) sin(rot_ang) 0; -sin(rot_ang) cos(rot_ang) 0; ((1-cos(rot_ang))*rot_cen(1)-sin(rot_ang)*rot_cen(2)) (sin(rot_ang)*rot_cen(1)+(1-cos(rot_ang))*rot_cen(2)) 1]);
image=imwarp(image,rot_mat);
but I'm quite unsure about it (and one part is missing..)
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Image Analyst
il 27 Gen 2022
@Marcel345614, thanks for reinforcing why I use MATLAB instead of Python! 😄
image=flipdim(image ,1); % is this correct??
No that is not correct. You should never call a variable image (or any other function name) since image is the name of a very important built-in function. Simply do
rotatedImage = imrotate(inputImage, angleInDegrees);
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Image Analyst
il 28 Gen 2022
Modificato: Image Analyst
il 28 Gen 2022
Honestly I don't do much or any warping in MATLAB so you'd have to figure that out just like I'd have to, so I'll leave it to you.
imshow() does not shift the image. I think you're not using the image you thought you were, like maybe you saved the figure with saveas() or print() or exportgraphics() rather than imwrite(), so you're getting some of the figure padding around the image, which depends on how you size and shape the figure on your screen.
If your original question is basically answered, can you click on the Accept this answer link for the best answer? Thanks in advance.
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Benjamin Thompson
il 27 Gen 2022
If you are using imwarp then you have the image processing toolbox. Try looking at imrotate.
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