多媒体同步中QoS到QoP的模糊映射

针对多媒体实时传输的质量要求,提出了同步QoP映射器的思想,即通过建立QoS(quality of service)到QoP(quality of presentation)的模糊映射,从感知的角度为分布式多媒体提供同步质量的度量工具.从分析Ralf Steinmetz博士的感知实验出发,提出了构造同步QoP映射器的算法.此算法以拟合感知困惑曲线为基础,通过提取模糊隶属度函数来实现QoS到QoP的模糊映射.在此基础上,给出了将此模糊QoP映射器应用于实时媒体传输的同步时间模型的实例,实例以模糊QoP映射器的模糊隶属度函数作为模糊控制机制的条件来控制同步语义的变迁,以实现媒体同步质量的调整.

Fuzzy Mapping of QoS to QoP in Multimedia Synchronization

In this paper, a synchronization QoP (quality of presentation) mapping concept is proposed for meeting the quality requirement of multimedia real-time transmission. The essence of this idea is to create a tool to measure the synchronization quality for distributed multimedia systems from the viewpoint of perceptive field through building the fuzzy mapping from QoS (quality of service) to QoP. Based on Dr. Ralf Steinmetz's perception experiment, the algorithm to construct the synchronization QoP mapping is proposed. This algorithm is based on approximating perceptual annoying curves. By extracting the fuzzy membership functions, it implements the fuzzy mapping from QoS to QoP. With this algorithm, the paradigm which applies the fuzzy QoP mapping to time model of multimedia synchronization in real-time multimedia communication is also presented. Using the fuzzy membership function of fuzzy QoP mapping as conditions of fuzzy control mechanism, the transition of synchronization semantics can be controlled to adjust the quality of media synchronization.