Video-Based Measurement of System Latency
Ding Long He, F. H. Liu, Dave Pape, Greg Dawe, Daniel J. Sandin · 2000
We describe an end-to-end latency measurement method for virtual environments. The method incorporates a video camera to record both a physical controller and the corresponding virtual cursor at the same time. The end-to-end latency can be concluded based on the analysis of the playback of the videotape. The only hardware necessary is a standard interlaced NTSC video camera and a video recorder that can display individual video fields. We describe an example of analyzing the effect of different hardware and software configurations upon the system latency. The example shows that the method is effective and easy to implement. 1. Introduction This paper describes a simple to implement method for measuring end-to-end system latency in projection based virtual environments such as CAVEs and ImmersaDesks [Cruz93]. Interactivity is an essential feature of virtual reality systems. System end-to-end latency, or lag, is one of the most important problems limiting the quality of a virtual...