Bit allocation for 3D video coding based on lagrangian multiplier adjustment

Multi-view video plus depth (MVD) format 3D video consists of color texture image and gray depth map, the depth map provides the scene geometry information and is utilized to synthesize the virtual views through Depth Image Based Rendering (DIBR) technique. The quality of the synthesized virtual views is related to the qualities of both texture image and depth map, thus bit allocation between texture image and depth map is very important in 3D video coding. In this paper, we propose to optimally allocate bits between texture image and depth map by adjusting the Lagrangian Multiplier (LM) in depth map coding, we adjust the LM based on the difference between texture image coding Quantization Parameter (QP) and depth map QP. Experimental results show that the proposed method can achieve optimal 3D video coding performance for different sequences under different bitrates, and the complexity of our method is extremely low.