论文部分内容阅读
实现基于标准视频编码过程的一个关键问题是宏块编码模式选择,而选择宏块编码模式控制参量的关键是确定DCT系数的量化因子.该文提出了一种基于宏块分类的最佳量化因子选择方法,着重讨论了二个问题:(1)宏块的R-Q模型和D-Q模型;(2)引人适当先验假设条件,根据宏块R-Q、D-Q模型,建立有限制条件的最优化表达式,得到最佳的分类宏块量化因子.模拟结果表明:与传统方法相比,基于宏块分类的最佳量化因子选择方法一定程度上能减少所需的编码比特.“,”A key problem in realization of video coder based on video coding standards is macroblock mode selection, and the choice of quantization factor of macroblock is the key problem in mode parameter selection A new optimization selection of quantization factor based on classified macroblock is presented in this paper, two problems are discused in detail: (l)the R-Q and D-Q model of the classified macroblock, (2) after introducing some proper assumed condition, we derive the quantization factor or macroblock from the optimized formulation based on the R-Q and D-Q model. Simulation result shows that Compared with the conventional mehtod, the optimization selection of quantization factor based on classified macroblock, in some degree, can "dare the bit needed to code a image.