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

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Dana
Dana 2014 年 3 月 18 日
編集済み: Alex Taylor 2014 年 3 月 19 日
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

回答 (2 件)

Matt J
Matt J 2014 年 3 月 18 日
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 年 3 月 19 日
編集済み: Alex Taylor 2014 年 3 月 19 日
If you have R2014a and the Image Processing Toolbox? You should look at imregcorr. It implements phase correlation based registration.

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