METHOD OF OBJECT AND BACKGROUND AREAS SELECTION IN DIGITAL IMAGES Russian patent published in 2008 - IPC H04N1/409 G06K9/46 

FIELD: physics, image processing.

SUBSTANCE: invention concerns digital image processing and can be applied in devices for automatic or personal identification by fingerprints. The method includes intensity gradient assessment calculation for each image pixel, including calculation of average intensity gradient magnitude for each pixel in arbitrary shaped local image areas with their size defined by parameters set in advance, calculation of average gradient magnitude for processed image, division of all pixels into two groups (background and image), object and background areas tagging and defining their size, forming of continuous areas by uniting tagged areas and defining their sizes, defining size limit values for continuous object areas, defining size limit values for continuous background areas, transition of object and background areas with sizes less than product of obtained limit values and given weighting factors to background and object areas respectively.

EFFECT: improved quality of object areas selection.

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