ACCURACY EVALUATION OF AN ONLINE KINEMATIC SYSTEM VIA DYNAMIC TESTS

The study presents an experimental methodology for evaluating the accu racy and reliability of the kinematic data collection of an on-line op toelectronic system used in biomechanics studies. The methodology is b ased on a series of dynamic tests using an independently measured and controlled frequency input varying systematically five different facto rs-(1) camera-object distance, (2) distance from calibrated field, (3) size of the calibration field, (4) position in the calibration field and (5) rotation speed. The proposed methodology is addressed mainly t owards medical related research or biomechanical analysis of human joi nts where a high degree of accuracy is of prime importance. It is used to evaluate the ELITE motion analysis system. The results of the stud y showed that the error distribution is sensitive to relatively small changes of the first four factors as the error magnitude was not affec ted strongly remaining within 2% of the object length for the majority of the experiments.