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Journal of Electronic Imaging

On the estimation of subpixel motion using phase correlation
Author(s): Vasileios Argyriou; Theodore Vlachos
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Paper Abstract

We propose a method for obtaining high-accuracy subpixel motion estimates using phase correlation. Our method is motivated by recently published analysis according to which the Fourier inverse of the normalized cross-power spectrum of pairs of images that have been mutually shifted by a fractional amount can be approximated by a two-dimensional sinc function. We propose a modified version of such a function to obtain a subpixel estimate of motion by means of variable-separable fitting in the vicinity of the maximum peak of the phase correlation surface. We demonstrate that our method outperforms, in terms of subpixel accuracy, not only other surface-fitting techniques but also the state-of-the-art in motion estimation using phase correlation including the technique that motivated our work in the first place. Furthermore, our method performs particularly well in the presence of artificially induced additive white Gaussian noise and also offers better motion vector coherence in terms of zero-order entropy.

Paper Details

Date Published: 1 July 2007
PDF: 8 pages
J. Electron. Imag. 16(3) 033018 doi: 10.1117/1.2762230
Published in: Journal of Electronic Imaging Volume 16, Issue 3
Show Author Affiliations
Vasileios Argyriou, Univ. of Surrey (United Kingdom)
Theodore Vlachos, Univ. of Surrey (United Kingdom)

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