基于感知模型的自适应码率控制算法  

Adaptive Rate Control Algorithm Based on Perceptual Model

作　　者：张锦辉[1] 石旭利[1] 张兆扬[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《电视技术》2008年第9期12-15,共4页Video Engineering

摘　　要：提出了一种基于人眼视觉系统(HVS)的感知模型,将反映视觉感知系统某部分特征的宏观描述统一到一个整体的数学模型中,特别是将人眼对于运动信息的感知特性与其他感知特性相融合。利用时空掩盖效应计算视频帧的复杂度与宏块的感知度。而自适应码率控制算法将根据帧复杂度分配给帧一个适当的比特数;根据宏块的感知度,将感知度低的区域的比特数转移到感知度高区域。新算法可以用更少的比特数获得更佳的主观视觉质量。The perceptual model based on the Human Visual System（HVS） is introduced, which puts some of the characteristics that reflect the HVS into one math model, especially synthesizes the movement information and other perceptual characteristics. The spatial and temporal masking effect is used to compute the frame complexity and the MB focus. According to the complexity and the focus, the adaptive rate control algorithm will distribute right bits to the frame, and transfer bits from the low focus areas to the high focus areas. The algorithm can get better subjective visual quality with fewer bits.

关 键 词：码率控制 感知模型 掩盖效应 H.264标准 

分 类 号：TN919.81[电子电信—通信与信息系统]