This paper presents a new direct Fourier-based algorithm for performing ima
ge-to-image registration to subpixel accuracy, where the image differences
are restricted to translations and uniform changes of illumination. The alg
orithm detects the Fourier components that have become unreliable estimator
s of shift due to aliasing, and removes them from the shift-estimate comput
ation. In the presence of aliasing, the average precision of the registrati
on is a few hundredths of a pixel.
Experimental data presented here show that the new algorithm yields superio
r registration precision in the presence of aliasing when compared to sever
al earlier methods and has comparable precision to the iterative method of
Thevenaz et al [21].