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The angular difference function and its application to image registration

By Yosi Keller, Yoel Shkolnisky and Amir Averbuch

Abstract

Abstract—The estimation of large motions without prior knowledge is an important problem in image registration. In this paper, we present the angular difference function (ADF) and demonstrate its applicability to rotation estimation. The ADF of two functions is defined as the integral of their spectral difference along the radial direction. It is efficiently computed using the pseudopolar Fourier transform, which computes the discrete Fourier transform of an image on a near spherical grid. Unlike other Fourier-based registration schemes, the suggested approach does not require any interpolation. Thus, it is more accurate and significantly faster. Index Terms—Global motion estimation, Fourier domain, pseudopolar FFT, image alignment. æ

Year: 2005
OAI identifier: oai:CiteSeerX.psu:10.1.1.187.4009
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