Abstract
Under the network bandwidth and the delay constrained, the rate control has become a key technique for video coding in order to obtain consecutive and high quality reconstructive video picture. Rate control scheme of the basic unit in H.264/AVC mainly adopted the linear MAD predict model and the quadratic rate distortion model, in the process of implementing, after coding a macroblock, the parameters of the models will be updated, and then computes the quantization parameters of the current macroblock. So, its computation cost is very high, and its complexity is also very high. Through analyzing the rate control scheme of the H.264/AVC JVT G012rl, the paper proposed an improved low complexity the MAD weighted predict model, and make the accurate rate control in the macroblock layer, and carried out it in the JM98 platform of JVT reference software in H.264/AVC. Extensive experiment results show the complexity of this scheme is lower than the JVT-G012rl of H.264/AVC, and the average PSNR of the usually standard test sequences increased O.lldB, at the same time, its accuracy of the rate control of the QCIF sequences averagely improved 0.498 kpbs.
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