Signal Adaptive Filtering Method and Signal Adaptive Filter for Ringing Noise Reduction

摘要

The present invention relates to a signal adaptive filtering method and a signal adaptive filter for reducing ringing noise in image data, the filtering method including weighting (1,-1) for each pixel of an image to be filtered, A pixel edge value generation step of performing an inclination calculation using a one-dimensional horizontal and vertical gradient operator of 2x1, comparing the absolute value with a predetermined threshold value, and generating the result as a binary value; A block edge map generation step of repeatedly generating a pixel edge value for each pixel of a block having a predetermined size to generate a binary edge map for the entire block; Determining whether the binary edge map information included in the filter window includes edge information by applying a filter window of a predetermined size to the generated binary edge map information; An average filtering step of filtering a pixel value belonging to the corresponding filter window by using a predetermined first weight value to generate a new pixel value if it is determined that the pixel value does not include edge information; And edge information, a new pixel value is generated by filtering the pixel values belonging to the corresponding filter window using preset second weight values, and if the pixel located at the center of the filter window is edge information Characterized in that it comprises a weighted filtering step without filtering.;According to the present invention, the ringing noise is removed from the decompressed image based on the block, thereby improving the quality of the decompressed image.