EP3499892

There is disclosed a method for use in a decoder of a bit stream of encoded data for determining a value of a significant-coefficient flag corresponding to a transform coefficient of a block among one or more non-overlapping blocks within a transform unit. The significant-coefficient flag is a member of a group of significant- coefficient flags corresponding to the block. The group has a significant-coefficient-group flag. The method comprises:upon determining that the value of the significant-coefficient-group flag is to be decoded from the bitstream and is one, determining the value of the significant-coefficient flag:to be one when all of the other significant-coefficient flags of the group have been previously determined to have a value of zero, andotherwise by decoding the value from the bitstream.