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Classification of protein crystallization images using Fourier descriptors

Walker, C.G., Foadi, J. and Wilson, J. (2007) Classification of protein crystallization images using Fourier descriptors. Journal of Applied Crystallography, 40 (3). pp. 418-426. ISSN 0021-8898

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The two-dimensional Fourier transform (2D-FT) is well suited to the extraction of features to differentiate image texture, and the classification of images based on information acquired from the frequency domain provides a complementary method to approaches based within the spatial domain. The intensity, I, of the Fourier-transformed images can be modelled by an equation of power law form, I = Ar, where A and are constants and r is the radial spatial frequency. The power law is fitted over annuli, centred at zero spatial frequency, and the parameters, A and , determined for each spatial frequency range. The variation of the fitted parameters across wedges of fixed polar angle provides a measure of directionality and the deviation from the fitted model can be exploited for classification. The classification results are combined with an existing method to classify individual objects within the crystallization drop to obtain an improved overall classification rate.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Chemistry (York)
Depositing User: York RAE Import
Date Deposited: 07 May 2009 15:53
Last Modified: 07 May 2009 15:53
Published Version: http://dx.doi.org/10.1107/S0021889807011156
Status: Published
Publisher: International Union of Crystallography
Identification Number: 10.1107/S0021889807011156
URI: http://eprints.whiterose.ac.uk/id/eprint/6480

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