MY167299A - Intra smoothing filter for video coding - Google Patents

Abstract

THIS DISCLOSURE RELATES TO TECHNIQUES FOR REDUCING THE AMOUNT OF ADDITIONAL DATA ENCODED WITH A BLOCK ENCODED USING INTRA-PREDICTIVE CODING. PARTICULARLY, THE TECHNIQUES PROVIDE APPARATUS AND METHODS OF APPLYING A SMOOTHING FILTER TO PREDICTION SAMPLES USED IN INTRA-PREDICTIVE CODING. FOR EXAMPLE, IN FIXED MODE-DEPENDENT INTRAPREDICTIVE CODING, A VIDEO ENCODER MAY DETERMINE THE TYPE OF SMOOTHING FILTER APPLIED TO PREDICTION SAMPLES BASED ON BLOCK SIZE AND INTRA-PREDICTION MODE COMBINATION ASSOCIATED WITH THE CURRENT BLOCK, WHERE THE COMBINATION IS USED TO LOOK UP A FILTER IN A FIRST FILTER TABLE. IN ADAPTIVE MODE-DEPENDENT INTRA-PREDICTIVE CODING, THE ENCODER USES TWO FILTERS, ONE FROM THE FIRST FILTER TABLE AND ANOTHER FROM A SECOND FILTER TABLE, APPLIES BOTH FILTERS, AND DETERMINES WHICH YIELDS BETTER RESULTS. WHEN THE SECOND FILTER TABLE FILTER YIELDS BETTER RESULTS, THE ENCODER ENCODES A FILTERING INDICATION. WHEN A FILTER FROM THE FIRST FILTER TABLE IS USED, NO FILTERING INDICATION IS ENCODED. (FIGURE 6)