Signaladaptives Nachverarbeitungssystem um Blockierungseffekte und Ringstörungen zu verringern

摘要

A signal adaptive filtering method is provided to reduce blocking effects caused by decompression of the block-based compressed images, including the steps of generating binary edge map information by globally thresholding and locally thresholding the decompressed image; judging whether the binary edge map information within a filter window corresponding to respective pixels is either homogeneous area or edge area, by using the binary edge map information belonging to a predetermined size of the filter window; generating a filtered pixel value corresponding to a respective pixel using the filter window which has a predetermined first weight factors related to the homogeneous area, when the binary edge map information is judged as the homogeneous area in the second step; altering the predetermined second weight factors according to a binary edge map information included in the filter window when the binary edge map information is judged as the edge area in the second step; and generating a filtered pixel value corresponding to the respective pixel, using the filter window which has altered second weight factors in said fourth step. A corresponding apparatus is also disclosed. <IMAGE>