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27 August 2019 360-deg shape measurement system based on three-dimensional orientation target
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Abstract

We present a system for 360-deg shape measurement based on three-dimensional (3-D) orientation target. The measurement system mainly includes a CCD camera, digital light projector, 3-D orientation target, and the measured object. The global coordinates for all chessboard corners of the target are calculated based on close-range photogrammetry, for which the relative orientation between camera stations is discussed in detail. According to the homography matrix between the checkerboard and its image plane, the position and orientation of the measuring camera relative to the target are determined. A dot-matrix structured light is designed and projected onto the measured object surface. In each image of the structured light deformed by the object shape, the pixel coordinates of the dot-centers are accurately calculated by the ellipse-fitting algorithm, and then they are all sorted in the same order by the beads-stringing matching method. In the experiment, the designated front, rear, left, and right surfaces of a reference object are measured, and their separate point clouds are automatically stitched together by the 3-D orientation target. Compared with coordinate measurement machine data, the accuracy of the system is demonstrated; the maximum deviations are +1.257  /    −  0.977  mm, and the standard deviation is 0.124 mm.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$28.00 © 2019 SPIE
Yunlei Li, Xi Zhang, and Dawei Tu "360-deg shape measurement system based on three-dimensional orientation target," Optical Engineering 58(8), 084111 (27 August 2019). https://doi.org/10.1117/1.OE.58.8.084111
Received: 23 April 2019; Accepted: 30 July 2019; Published: 27 August 2019
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