How can I detect small (less than 1° ) rotations using FFT phase correlation?

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Dana
Dana on 18 Mar 2014
Edited: Alex Taylor on 19 Mar 2014
Hi, I'm trying to detect sub-pixel differences between 2 images. All working so far with translation. The rotation method however isn't so accurate with small angles esp the ones that really inteerst me (0.1~ 3). I also upsample my images for better results but still not so accurate. Any advice on what I should edit : log-polar interpolation.. add a filter .. ? Thanks Dana

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Answers (2)

Matt J
Matt J on 18 Mar 2014
Rotation in image space induces translation in radon space. Take the RADON transform of your image and apply the phase correlator to that.
Alex Taylor
Alex Taylor on 19 Mar 2014
Edited: Alex Taylor on 19 Mar 2014
If you have R2014a and the Image Processing Toolbox? You should look at imregcorr. It implements phase correlation based registration.
http://www.mathworks.com/help/images/ref/imregcorr.html

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