Automatic high-resolution optoelectronic photogrammetric 3D surface geometry acquisition system |
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Authors: | Wen-Jean Hsueh Erik K Antonsson |
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Affiliation: | (1) Mechanical Systems Laboratory, General Electric Corporate Research & Development, Schenectady, New York 12301, USA e-mail: hsueh@oes.itri.org.tw , US;(2) Division of Engineering and Applied Science, California Institute of Technology, 104-44, Pasadena, California 91125, USA , US |
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Abstract: | A fast, high-resolution, automatic, non-contact 3D surface geometry measuring system using a photogrammetric optoelectronic
technique based on lateral-photoeffect diode detectors has been developed. Designed for the acquisition of surface geometries
such as machined surfaces, biological surfaces, and deformed parts, the system can be used in design, manufacturing, inspection,
and range finding. A laser beam is focused and scanned onto the surface of the object to be measured. Two cameras in stereo
positions capture the reflected light from the surface at 10 kHz. Photogrammetric triangulation quickly transforms the pair
of 2D signals created by the camera detectors into 3D coordinates of the light spot. Because only one small spot on the object
is illuminated at a time, the stereo correspondence problem is solved in real time. The resolution is determined by a 12-bit
A/D converter and can be improved up to 25 60025 600 by oversampling. The irregular 3D data can be regularized for use with image-based algorithms.
Received: 8 October 1996 / Accepted: 3 February 1997 |
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Keywords: | : Range-finding – Metrology – Active vision – Triangulation – Photogrammetry |
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