By the same authors

From the same journal

Classification of protein crystallisation images using Fourier descriptors.

Research output: Contribution to journalArticlepeer-review



Publication details

JournalJournal of Applied Crystallography
DatePublished - Jun 2007
Issue number3
Number of pages9
Pages (from-to)418-426
Original languageEnglish


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 modeled 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 crystallisation drop to obtain an improved overall classification rate.

    Research areas

  • Classification, Crystallization images, Fourier transform, Pattern recognition


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