Method and apparatus for removing blocking effects in a motion picture decoder

Methods and apparatus for removing blocking effect in a motion picture decoder. Boundary pixel values of a current block and corresponding adjacent block are extracted. A mean value for the resulting difference values between the extracted pixel values of the current and adjacent blocks is calculated. The calculated mean value is limited between - 12 and 12 quantization step size. The limited mean value is added to the each pixel values of the current block to generate a resulting output. In another aspect, absolute values for the resulting difference values between extracted pixel values of the current and adjacent block is calculated. The calculated absolute values are compared with the respective difference values and threshold level to determine whether the current block contains an edge. The current block without the edge is selected, filtered, and outputted, in which the blocking effect due to a quantization error is removed without having distortion to the original data.