A Novel Rate Control Scheme for Low Bit Rate Stream of H.264
一种新的面向H.264低比特流的码率控制方法

There are two limitations in JVT-G012 scheme: firstly, the linear MAD prediction model performs poorly due to high motion or scene changes. Secondly, there exist much more complex motion compensation strategies in H.264, and a higher percentage of bits is required to encode non-texture data. Thus the method that simply predicts non-texture bits through the previous coded frames is no longer efficient. First of all, a macroblock-based histogram of difference is introduced, and bits are allocated rationally among coding units according to image complexities. Furthermore, a novel rate control scheme named Spatio-Temporal MAD prediction model is presented, and a more flexible non-texture prediction scheme is derived. As shown in experiments, the proposed algorithm achieves a bit rate closer to the target, and provides an improved visual quality and the higher PSNR.