A quality control mechanism for networked virtual reality system with video capability

Introduction of motion video including live video into networked virtual reality systems makes virtual spaces more attractive. To handle live video in networked virtual reality systems based on VRML, the scalability of networked virtual reality systems becomes very important on the Internet where the performance of the network and the end systems varies dynamically. We propose a new quality control mechanism suitable for networked virtual reality systems with live video capability. Our approach is to introduce the notion of the importance of presence (IoP) which represents the importance of objects in virtual spaces. According to IoP, the degree of the deterioration of object presentation will be determined in case of the starvation of system resources.