Real-Time Tracking of Articulated Human Models Using a 3D Shape-from-SilhouetteMethod

摘要

This paper describes a system which acquires 3D data and uses the data to trackan eleven degree of freedom human model in real-time. Using four cameras we create time-varying volumetric image (a visual hull) of whatever object is moving in the space observed by all four cameras. We are currently operating the sensor in a volume of approximately 500,000 voxels (1.5 inch cubes) at a rate of 25 Hz. We are able to track the upper body dynamics of a human within the workspace. The system is able to track the x, y position of the body, a torso rotation about the z axis, along with four rotations in each arm. Tracking occurs using a method we developed to be extremely fast, which allows data acquisition and tracking to occur on one computer at a rate of 16 Hz. We also developed a calibration procedure, which allows the system to be reconfigured or even moved and to quickly be recalibrated.