Inter-View Direct Mode for Multiview Video Coding

Abstract—Global disparity between views is usually caused by the displacement between cameras, which can be accurately rep-resented by a global geometric transformation. In this paper, we first propose an inter-view motion model in terms of the global geometric transformation to represent the motion correlation be-tween two adjacent views. Specifically, the motion vector of a pixel in one view may be directly derived from that in another view ac-cording to the inter-view motion model. Further, we propose an inter-view direct mode to signal the decoder that the motion of a macroblock (MB) can be achieved from the coded view without any coding bits. The proposed inter-view direct mode is further in-corporated in the existing multiview video coding (MVC) schemes (i.e., AVC-based MVC and 4-D wavelet-based MVC), working to-gether with the other classical coding modes. The mode selection at each MB is accomplished with the rate-distortion optimization technique. The proposed inter-view direct mode can significantly reduce bits to code motion vectors especially at low bit rates, thus improving the coding efficiency. Index Terms—Direct mode, inter-view correlation, motion vector prediction, multiview video coding (MVC). I