Patent ID: RE43709

Claim:
A method for reducing a blocking effect in a compressed video signal, comprising: the decoding step of restoring a motion compensated video signal to an original video signal by reducing the prediction residual between the motion compensated video signal and the original video signal and the blocking effect; and the post-filtering step of performing post-filtering in a blocking elimination filter to reduce a blocking effect and ring effect remained in the compensated signal, wherein the decoding step comprises, considering the direction of a pixel adjacent to the original pixel of the video signal to be restored, defining an additional function of the reliability and degree of smoothing of each pixel adjacent to the original pixel, obtaining a normalization parameter α that gives a weight value to the reliability and degree of smoothing of the original video signal using the additional function, calculating a pixel to be restored according to the normalization parameter α, compressed video signal, and size of quantization using a function, and designating values of the normalization parameter α by differently setting the degree of smoothing based on the position of the pixel to be restored in response to the position of the reference pixel.