Post-processing for real-time quality enhancement of MPEG-coded video sequences

In this paper, a novel adaptive spatial-variant FIR filter is proposed for the reduction of compression artifacts in MPEG coding. The selection of the appropriate filtering kernel is performed by a classification of the processed regions based both upon the distribution of the energy among the transform coefficients and on the distance from edge pixels, extracted with the Sobel operator. Experimental results show that the proposed algorithm outperforms existing enhancement approaches, especially when constraints on low-complexity and real-time processing are compelling.