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The original method utilizes the phase of the images and has its roots on phase correlation (PC) registration. The even powers of the normalized Fourier transform of an image are invariant to centrally symmetric blur, such as motion or out-of-focus blur. Then use these results to propose blur-invariant phase correlation. The method has been compared to PC registration with excellent results. The method works for unknown blurs assuming the blurring PSF exhibits an N-fold rotational symmetry. Itdoi:10.5281/zenodo.1471989 fatcat:4ipo5jj3unbb5b5yydodaidinu