Bvd sign inference in ibc based on bv and bvp components

Abstract

A decoder receives, from a bitstream for a video, an indication of a block vector predictor (BVP) for a block vector (BV). Each of the BV, the BVP, and a block vector difference (BVD) associated with the BV and the BVP has two components in two respective directions. The decoder determines a sign of a component of the BVD in one direction of the two directions based on: a component of the BV in the other direction of the two directions, and a component of the BVP in the one direction. The decoder further decodes the BV based on the BVP and the BVD determined based on the sign, and generates, based on the BV, an intra block compensated prediction of a current block. The decoder decodes the current block based on the intra block compensated prediction and a residual of the current block.