How to rotate an image along y-axis?

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Geetika
Geetika on 21 Jan 2014
Commented: Image Analyst on 4 Feb 2015
I want to rotate an image along y-axis. I tried using 'rotate' command of MATLAB but could not succeed. Can anyone plz help?

Answers (2)

Nitin
Nitin on 22 Jan 2014
Please try imrotate, you can find more information here
Alternatively, you can try flipdim or rot90
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Image Analyst
Image Analyst on 4 Feb 2015
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).
  2 Comments
Image Analyst
Image Analyst on 4 Feb 2015
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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