| |
| In three-dimensional (3D) video coding, the distortions in texture videos and depth maps can all affect the quality of the synthesized virtual view. Therefore, under the total bitrate constraint, effective bit allocation between texture and depth is very important for 3D video coding. In this paper, a joint bit allocation and rate control method for multi-view video plus depth (MVD) based 3D video coding is proposed. We firstly derive a view synthesis distortion model to characterize the effects of coding distortions of texture videos and depth maps on the synthesized virtual view. Based on this model, we derive a rate-distortion model to characterize the relationship between the bitrate and the view synthesis distortion, and the optimal bitrate ratio between texture and depth is established by solving optimization problem. Then, rate control algorithm is performed on view level, texture/depth level and frame level. Experimental results show that compared with other method, the proposed bit allocation method can obtain higher performance of view synthesis. Moreover, the proposed rate control method can accurately control the bitrate to satisfy the total bitrate constraint. |
|
| Keywords:image processing; 3D video coding; bit allocation; rate control; view synthesis distortion |
|
