Motion measurement with high-speed video.

A new kinematic measurement system based on a high-speed video system, combined with a computer-assisted evaluation for the analysis of gait patterns, is described. The system allows both a reviewable visual assessment in slow motion (up to 1000 frames s-1 as well as automatic measurement of the kinematics of body segments. Specially developed software, which uses a pattern search algorithm and an additional subpixel correction, results in a deviation of less than 0.1% (without considering the lens nonlinearity). For most cases the recognition and tracking of temporarily concealed markers is also achieved. The results of the computer-assisted high-speed video analysis are being applied in rehabilitation programmes to increase the objectivity of standard movements, e.g. gait analysis of people with artificial limbs.