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

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Dana
Dana 2014-3-18
编辑： Alex Taylor 2014-3-19
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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回答（2 个）

Matt J
Matt J 2014-3-18
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 2014-3-19
编辑：Alex Taylor 2014-3-19
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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