Abstract
In this paper, the authors achieved a 3D motion capture system by using one camera with triangle markers, named as Mono-MoCap (MMC). The camera parameters were calibrated by means of the modified Direct Linear Transformation (DLT) method. The relation between the image coordinate value and the absolute coordinate value was expressed by the calibrated camera parameters. The absolute coordinate values of apexes of a triangle marker were calculated on the basis of the perspective n point (PnP) problem. As compared with a conventional stereo vision typed motion capture system, MMC had enough accuracy for 3D measurement in the depth of 1.0 to 1.3m from a camera. Also, by putting a triangle marker on each human joint, MMC could capture a human walking motion, and MMC had the wider measuring range than the stereo vision system in the parallel plane of the image frame.
