一种面向H.264/AVC的新型宏块级码率控制算法

针对H.264/AVC码率控制模型的不足，提出了平均绝对变换量化误差（MATQD）的概念，以及基于MATQD的加权预测模型和新的二次R-D（Rate-Distortion）模型，然后给出完整的宏块级码率控制算法，其中，在预测宏块纹理码字分配时，提出了用MATQDratio计算宏块目标码字以及一个头码字的加权预测模型。实验结果表明，与JM8.5下的标准码率控制算法JVT-G012相比，本文提出的算法的码率控制精度更高，输出码流更加平稳，图像的平均质量更好。

Novel macro-block layer rate control algorithm for H.264/AVC

To solve the issues of rate control model in H.264,a novel macro-block layer rate control strategy and implementation for H.264 were proposed.Firstly,a new concept of coding complexity measure was presented,so-called Mean Absolute Transform Quantized Distortion(MATQD).Then,the weighted prediction model for MATQD and an improved quadratic R-D model based on MATQD were proposed,respectively.Moreover,the whole procedure of rate control algorithm was proposed,especially when dealing with the allocation of texture bits for current macro-block,MATQD_(ratio) was used to compute the target bit and a weighted prediction model was presented for header bits.The experimental results show that our method is better rate control performance than that of JVT-G012 in JM8.5 in terms of control precision,bit fluctuation and image quality.