DIGITAL PROCESSING METHOD FOR AMPLITUDE IMAGES Russian patent published in 2002 - IPC

FIELD: computer processing of images, video telephony, video conference communications, digital television broadcast systems. SUBSTANCE: method is characterized in that results of subtracting values of respective pixels of source block and block obtained by digital cosine transform, quantization with preset factor, back cosine transform, and comparison of moduli of differences obtained with tolerated values are used to compute desired quantization factor for minimizing distortions of pixel levels to values not over computed permissible ones that follows their digital encoding upon repeated quantization of frequency components. The result is improved visual quality of recovered image at preset compression ratio or enhanced compression ratio at desired visual quality of recovered image, and implementation of image compression ratio ensuring its transmission in preset-capacity channel. EFFECT: reduced number of computer operations for image processing. 3 cl, 2 dwg