How to rotate an image along y-axis?

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Geetika 2014-1-21

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评论： Image Analyst 2015-2-4

I want to rotate an image along y-axis. I tried using 'rotate' command of MATLAB but could not succeed. Can anyone plz help?

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Answer 1

Nitin 2014-1-22

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Please try imrotate, you can find more information here

Alternatively, you can try flipdim or rot90

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Kritika 2015-2-4

Hello,

I also have the same problem as of your.Hoping that you might have found some solution to this problem.So, Please share your solution with me. you can mail me at kritikamittal1991@gmail.com

Image Analyst 2015-2-4

See my answer below.

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Answer 2

Image Analyst 2015-2-4

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在 MATLAB Online 中打开

If you want rotation along the y axis instead of the z axis, then the image will appear foreshortened (narrower), thus the width is reduced. So you can simply use imresize() to calculate the new size. The new number of columns will be

theta = pi/12;  % Whatever.
[rows, columns, numberOfColorChannels] = size(originalImage);
newColumns = columns * cos(theta);
rotatedImage = imresize(originalImage, [rows, newColumns]);

This will be like you're tilting the right edge of the image towards you as you look down along the z axis to it (looking at the image perpendicularly).

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Geetika 2015-2-4

Thank you very much for your reply. But what if I rotate the image by pi/2 means 90 degrees. It will just return a column vector. How to visualize the new image?

Image Analyst 2015-2-4

Yes, if you rotate along the y axis, the image will rotate out of the plane and you will be looking at it "edge-on". It will be a column vector. Similarly if you rotate 90 degrees about the x axis, you will get a row vector. I don't know why you'd want to do that, but you can use imshow() to visualize the new edge-on image.

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