Multi-target indoor tracking and recognition system with infrared markers for virtual reality

Virtual reality (VR) is a computer simulation technology, which can create a virtual world to allow users to immerse in the simulated environment, and be able to interact with objects in a nature way. This paper presents an indoor tracking and recognition system to meet the interactive of multiple users in virtual reality. As we all know, tracking in real time and accurately play a vital role in VR application. Interactive VR games require data update rate above 35HZ to make players fell well. In our system, we use infrared cameras, infrared markers and image processing techniques to acquire the users' position and orientation information in real time. We describe a relatively inexpensive, but can monitor the precise location and orientation information system. In our system, cheap infrared cameras are fixed on ceiling. Every user in the environment wears an infrared LED module. The distance between any two infrared LED in a LED module is different with others. We can distinguish every user and get their precise position and orientation in real time by stereo vision theory and our recognition algorithm. This system strikes a good balance between price and capability.