Comparison of the performance of 3D camera systems II

The accuracy and processing time of 11 commercially available 3D camera systems were tested to evaluate their performance in clinical gait evaluation. The systems tested were Ariel APAS, Dynas 3D/h, Elite Plus, ExpertVision, PEAK5, PRIMAS, Quick MAG, VICON 140, VICON 370, color Video Locus and reflective Video Locus. The 3D locations of markers on both ends of a rigid bar were determined. The distance between these markers was calculated from these data and compared with the true value, which was measured with a slide caliper prior to the measurement. For the estimation of noise, 3D coordinates of the markers were measured while the same rigid bar was placed on the floor, and the standard deviations were calculated. The processing time for calculating 3D coordinates from data obtained during normal gait was measured.