Optimal dependent bit allocation for AVS intra-frame coding via successive convex approximation

We consider the optimal dependent bit allocation strategy for AVS intra-frame coding. Due to the block-based predictive coding, the rate-distortion (R-D) characteristics of neighboring blocks are dependent with each other. However, the interblock coding dependency is neglected in most of the existing bit allocation methods. Different from the conventional methods, the proposed method fully exploit the interblock coding dependency and carefully leverage it in the problem formulation. Then successive convex optimization techniques are employed to convert the original nonconvex optimization problem into a series of convex optimization problems which can be solved efficiently and optimally. Experimental results have proved the superiority of the proposed method in terms of significant R-D performance improvement.