METHOD OF AUTOMATIC DETECTION AND CORRECTION OF RADIAL DISTORTION ON DIGITAL IMAGES Russian patent published in 2009 - IPC H04N3/23 G06T5/40 

FIELD: physics; computer engineering.

SUBSTANCE: present invention pertains to computer technology and can be used for detecting and correcting radial distortion on images, obtained using digital still cameras, camcorders and computer vision systems, which use image sensing arrays as image detectors. In the method, the distortion coefficient is determined. Contour-maps are marked out and analysed. Three points are selected on each contour and radial distortion coefficients are calculated. Histograms are drawn of the repetition frequency of the calculated coefficients versus their values. The value of the coefficient is defined as the average in the neighbourhood of the value of the coefficient with maximum repetition frequency. Distortions arising from radial distortions are then corrected.

EFFECT: increased rate of determining radial distortion coefficient, increased accuracy of correcting distortions arising from radial distortions, as well as widening of the field of application due to use of the method, independent of parameters of the device in which an image is obtained, based on information contained in the image itself.

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