A local-adapted disparity vector derivation scheme for 3D-AVS

In the 3D extension of Audio Video Coding Standard (AVS), i.e. 3D-AVS, the Global Disparity Vector (GDV) derivation technique has been proposed to provide an estimation for Disparity Vector (DV) in inter-view prediction, where the GDV is generated by averaging all Disparity Vectors (DVs) in the latest previously coded frame. The prediction accuracy of GDV may be however limited by the lack of local adaptivity. In this paper, we introduce a novel Local Disparity Vector (LDV) derivation scheme. Specifically, the DV of the current block is calculated from the DVs within a neighboring region, whose size can be adaptively expanded to increase the robustness and accuracy. Experimental results show that the proposed LDV derivation method can provide around 2.12% and 1.37% bitrate reductions for compressed views and synthesized views compared with the GDV scheme, respectively.