OPTICAL METHODS FOR SHAPE MEASUREMENT

Practical three-dimensional computer vision techniques for full-field surface measurement

[+] Author Affiliations
Y. Y. Hung, L. Lin, H. M. Shang, B. G. Park

Oakland University, Mechanical Engineering Department, Rochester Hills, Michigan?48309

Opt. Eng. 39(1), 143-149 (Jan 01, 2000). doi:10.1117/1.602345
History: Received June 20, 1999; Revised Aug. 11, 1999; Accepted Aug. 11, 1999
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Abstract

Two practical computer-aided optical techniques for full-field surface shape measurement are presented, one for diffuse surfaces and the other for specularly reflective surfaces. The former technique is based on projecting a computer-generated fringe pattern onto a diffuse surface, and the latter is based on reflecting the fringe pattern from a specularly reflective surface. The fringe pattern is perturbed in accordance with the object surface with the fringe phase bearing information on the depth/slope of the object surface. The computer-generated fringe pattern conveniently enables the fringe phase to be manipulated, and hence the determination of the phase distribution using a phase extraction algorithm. Instead of deriving the mathematical relationship between the fringe phase distribution and the surface depth/slope, this relationship is obtained by calibration. The techniques described can be easily implemented for rapid measurement of 3-D surface shapes in an industrial setting. © 2000 Society of Photo-Optical Instrumentation Engineers.

© 2000 Society of Photo-Optical Instrumentation Engineers

Citation

Y. Y. Hung ; L. Lin ; H. M. Shang and B. G. Park
"Practical three-dimensional computer vision techniques for full-field surface measurement", Opt. Eng. 39(1), 143-149 (Jan 01, 2000). ; http://dx.doi.org/10.1117/1.602345


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