Key Issues of Wide-Area Tracking System for Multi-user Augmented Reality Adventure Game

Augmented reality (AR) Adventure Game is a wide-area indoor AR application for multiple users in Guangdong science center. Tracking the pose of users´ head in wide area is crucial for alignment between virtual and real scene. This paper studies the key issues of wide-area indoor tracking system. Different from previous inside-looking-out vision-based tracking, coded infrared (IR) markers are installed both on walls and ceiling in the proposed system. An automatic method is designed to calibrate the transformation between tracking camera and scene camera. The linear algorithm used for pose estimation is presented and problems of registration in rendering engine are also discussed. Experiments are conducted and applications in the AR Adventure Game prove that the proposed tracking system can provide precise and stable registration in actual systems.