title: A flexible high-precision video system for digital recording of motor acts through lightweight reflex markers.
abstract: This paper describes and evaluates the digital MacReflex system for wireless recording of movements in three dimensions. Up to seven high resolution infra-red sensitive CCD video cameras with electronic shutters register the positions of maximally 40 stroboscopically illuminated retro-reflective tape markers. The system is equipped with real-time video processors for computation of position co-ordinates for the markers and for optimised data transmission and storage. Data are output to any type of computer through a standard serial interface, which also provides possibilities for simultaneous A/D-sampling. Dynamic manipulation of the recorded signals in three-dimensional plots is provided by standard software and transformation and evaluation of recorded data are performed in standard software. The described equipment is found to offer a flexible and easily operated solution for recording of movements with high resolution.
authors: Qualisys AB, Partille, Sweden.
authors: T
authors: T
authors: Josefsson
authors: E
authors: E
authors: Nordh
authors: P O
authors: PO
authors: Eriksson
mesh_terms: D003196:Computer Graphics; D003201:Computers; D006801:Humans; D009043:Motor Activity / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D012018:Reflex; D012815:Signal Processing, Computer-Assisted; D012984:Software; D014741:Video Recording / Q000295:instrumentation* / Q000379:methods