基于基本单元相关性的新型码率控制算法  

New Rate Control Algorithm Based on Basic-unit Relativity

作　　者：闫小涛[1] 张翠芳[1] 闫仕杰[2] 邹兴文[1] 

机构地区：[1]西南交通大学信息科学与技术学院,四川成都610031 [2]西安工程大学学生处,陕西西安710048

出　　处：《电视技术》2009年第5期33-35,52,共4页Video Engineering

摘　　要：在帧层和宏块层提出一种改进的码率控制算法。在帧层利用编码比特与目标比特的差值对下一帧目标比特进行调整,在宏块层利用宏块相关性提出了一种新型平均绝对差值(MAD)预测策略——大小三角形法预测宏块MAD。实验结果表明,改进算法不仅码率的控制更加精确,而且图像的视觉质量也得到提高。An improved algorithm is presented in frame layer and malblock layer.Target bit of next frame is adjusted based on deviation between current target bit and real bit in frame layer,and a new Mean Absolute Deviation(MAD) predicting way called big-small triangle is put forward to predict MAD of current malblock in malblock layer.Experimental results prove that the new algorithm can not only get more accurate,but also make vision quality better.

关 键 词：码率控制 比特分配 MAD预测 基本单元相关性 

分 类 号：TN919.81[电子电信—通信与信息系统]