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matejak / imreg_dft

Image registration using discrete Fourier transform.
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Add outright support for sub-pixel precision #10

Open matejak opened 9 years ago

matejak commented 9 years ago

This can be achieved by doing smart things when evaluating the phase correlation.

arve0 commented 9 years ago

Might look into scikit-image, which has implemented this: https://github.com/scikit-image/scikit-image/blob/master/skimage/feature/register_translation.py#L195

They use the reference Manuel Guizar-Sicairos, Samuel T. Thurman, and James R. Fienup, "Efficient subpixel image registration algorithms," Optics Letters 33, 156-158 (2008).

arve0 commented 9 years ago

Just stubled upon A study of sub-pixel motion estimation using phase correlation, which uses fitting of a sinc function to the peak in the phase correlation. It claims to perform better (both resource and time wise) than up-sampling-techniques.

matejak commented 9 years ago

I have added linear interpolation to the log-polar stuff. It mostly improves things, but not always. Depends on #11

matejak commented 8 years ago

It seems that the resampling way is more robust than the interpolation.