中文摘要：

提出了一种新颖的编码特性预测机制，较为充分地利用了视频信源的时空相关性，改进了率失真建模的有效性；利用Lagrangian优化理论推导出两种率失真优化的位分配方案，并实现了相应的码率控制算法，即线性模型算法和二次模型算法．大量实验数据表明：线性模型算法和二次模型算法的编码效率基本上相同，而前者的码率控制能力稍优于后者；和H．264／AVC参考软件中所采用的JVTG012码率控制算法相比，两种新算法在获得更高编码效率的同时，能够更加准确地控制输出码率。

英文摘要：

In this work, a novel coding characteristics prediction scheme is presented to improve R-D modeling, by exploiting spatio-temporal correlations. Two different approaches to the problem of optimum bit allocation at a macroblock-by-macroblock basis are achieved, one of which is developed on a modified MPEG-4 Q2 rate model and the other on a linear rate model. Extensive experiments show that the linear scheme is a bit more accurate than the quadratic one while they achieve similar coding performance. It＇s also shown that both the two schemes significantly exceed JVT G012, the current standardized RC scheme.