Improved disparity vector derivation for inter-view residual prediction in 3D-HEVC

Inter-view residual prediction and advanced residual prediction (ARP) are efficient tools for coding dependent views of 3D video. It can predict the residue of motion compensated prediction (MCP) using the additional derived disparity vector. However, its coding performance depends on the accuracy of disparity vector derivation. In this paper, we propose the improved disparity vector derivation scheme for ARP. In the proposed scheme, the disparity vector is derived from the corresponding block in the reference picture. And that corresponding block is pointed by the same as MCP. Moreover, the disparity vector can be derived not only from the current reference block, but also from the blocks on the all other reference pictures included in the current reference picture lists. In addition, the disparity vector can be derived from both of the blocks predicted by disparity compensated prediction (DCP) and the blocks predicted by MCP and ARP because the derived disparity vector for ARP is stored in additional disparity vector field. Experimental results show that 0.2% bitrate reduction of synthesized views, and up to 0.5% for each dependent views in the reference software of 3D-HEVC.