Patent ID: 9698821
Date: 2017-07-04
CPC Classifications: H03M,H04N

Claim:
1. A method for video decoding, the method being performed on a microprocessor or a computer, and comprising the steps of: decoding a coding of a significance mapping; and decoding a subsequent coding of values of transform coefficients being unequal to zero for blocks of video pictures containing transform coefficients being unequal to zero, wherein the significance mapping specifies the positions of the transform coefficients being unequal to zero in a scan order and comprises, in the scan order, —except for the last scan position in the scan order—a one-bit symbol (SIG) for each coefficient of the block and a one-bit symbol (LAST) for each significant coefficient of the block, wherein (SIG) serves for identifying significant coefficients and (LAST) indicates whether there are further significant transform coefficients in the block, and the coding of values of transform coefficients being unequal to zero comprises coded values of the transform coefficients being unequal to zero in a reverse scan order—starting from the last transform coefficient being unequal to zero, wherein the decoding a coding of the significance mapping comprises arithmetically decoding the significance mapping; and wherein the decoding the subsequent coding of the values of the transform coefficients comprises arithmetically decoding the coded values of transform coefficients being unequal to zero in reverse scan order, wherein magnitudes of the transform coefficients being unequal to zero are binarized into a binarization and at least one binary decision of the binarization is decoded by context-adaptive binary arithmetic decoding.