Patent ID: 7702013

Claim:
A method for coding transform coefficients, the method being performed by a computer programmed to perform, for blocks of (video) pictures containing transform coefficients being unequal to zero, a coding of transform coefficients takes place in such a way that, for each block, a significance map is coded, the significance map specifying the positions of transform coefficients being unequal to zero in the block in a scan order in a context-dependent way using contexts depending on the corresponding scan position of the transform coefficient considered, and subsequently, the values (levels) of the transform coefficients being unequal to zero are coded by, in a reverse scan order—starting with the last transform coefficient being unequal to zero within the block—binary arithmetically coding bins of a binarization of a magnitude of the transform coefficients being unequal to zero in a context-dependent way using contexts depending on how many transform coefficients having a magnitude of 1 have already been coded in the reverse scan order up to a respective currently coded transform coefficient, and how many transform coefficients having a magnitude of greater than 1 have already been coded in the reverse scan order up to the respective currently coded transform coefficient, with coding all bins of the binarization of the respective currently to be coded transform coefficient being unequal to zero before proceeding with coding the bins of the binarization of a —in the reverse scan order—succeeding transform coefficient being unequal to zero.