12 December 1997 Marker-referred movement measurement with gray-scale coordinate extraction for high-resolution real-time 3D at 100 Hz
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Abstract
A review of early history in photography highlights the origin of cinefilm as a scientific tool for image-based measurement of human and animal motion. The paper is concerned with scanned-area video sensors (CCD) and a computer interface for the real-time, high-resolution extraction of image coordinates of moving markers. Algorithms and implementations are reviewed for the estimation of marker midpoints. Two-valued (above-threshold) representations of the video signal, as well as grey-scale digitizing are discussed. Attainable resolutions and computational effort are presented. Distributed, per-camera processing is a new option, which uses an embedded microcomputer for image reduction to real-time marker midpoint data. Developments are discussed in 3-D camera calibration and in the real-time 3-D matching of marker images, essential in realtime 3-D reconstruction. Applications are in 3-D motion capture for animation and in motion analysis of wind turbine rotors. Keywords: markers, embedded image processing, coordinates, location, grey-scale processing, sub-pixel resolution, marker tracking, 3D, real-time, motion capture, animation, wind turbines, motion analysis.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. Hans Furnee, E. Hans Furnee, Akos Jobbagy, Akos Jobbagy, Jan Cees Sabel, Jan Cees Sabel, Hans L. J. van Veenendaal, Hans L. J. van Veenendaal, Ferenc Martin, Ferenc Martin, Denie C.W.G. Andriessen, Denie C.W.G. Andriessen, } "Marker-referred movement measurement with gray-scale coordinate extraction for high-resolution real-time 3D at 100 Hz", Proc. SPIE 3173, Ultrahigh- and High-Speed Photography and Image-based Motion Measurement, (12 December 1997); doi: 10.1117/12.294548; https://doi.org/10.1117/12.294548
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