A FLEXIBLE HIGH-PRECISION VIDEO SYSTEM FOR DIGITAL RECORDING OF MOTORACTS THROUGH LIGHTWEIGHT REFLEX MARKERS

This paper describes and evaluates the digital MacReflex(TM) system fo r wireless recording of movements in three dimensions. Up to seven hig h resolution infra-red sensitive CCD video cameras with electronic shu tters register the positions of maximally 40 stroboscopically illumina ted retro-reflective tape markers. The system is equipped with real-ti me video processors for computation of position co-ordinates for the m arkers and for optimised data transmission and storage. Data are outpu t to any type of computer through a standard serial interface, which a lso provides possibilities for simultaneous A/D-sampling. Dynamic mani pulation of the recorded signals in three-dimensional plots is provide d by standard software and transformation and evaluation of recorded d ata are performed in standard software. The described equipment is fou nd to offer a flexible and easily operated solution for recording of m ovements with high resolution.