METHOD OF ENHANCING DIGITAL IMAGES Russian patent published in 2012 - IPC G06T5/00 

FIELD: information technology.

SUBSTANCE: source RGB image is obtained; RGB image noise is filtered; global contrast of the RGB image is adjusted; a brightness component from R,G,B components is extracted from the colour image by transforming the RGB into a three-component colour system. Shadow tones of the image are adjusted by adding to brightness values of each image pixel the product of the difference between pixel brightness values, which corresponds to the image of details in the shadow tones, and the image pixel brightness, inverting the doubled result of bilateral filtration in the dark half of the image brightness range, raised to a power which determines the width of the tonal range, and the amplification coefficient of the shadow tones.

EFFECT: broader functional capabilities owing to amplification of local contrast in light, shadow and halftones of an image.

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