Real-time range imaging system based on a light-emitting diode array phase-shift range finder for fast three-dimensional shape acquisition

A high-resolution, real-time range imaging system based on a LED array phase-shift range finder was developed to measure three-dimensional surface profiles. The range image is captured by a time-division scanning LED array heterodyne phase-shift range finder. The phase measurement used for obtaining...

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Bibliographic Details
Published in:Optical Engineering 2010-07, Vol.49 (7), p.073201-073201
Main Authors: Wang, Huanqin, Xu, Jun, He, Deyong, Zhao, Tianpeng, Ming, Hai, Kong, Deyi
Format: Article
Language:English
Subjects:
Arrays
Design engineering
Imaging
Light-emitting diodes
Mathematical models
Range finders
Real time
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Summary:A high-resolution, real-time range imaging system based on a LED array phase-shift range finder was developed to measure three-dimensional surface profiles. The range image is captured by a time-division scanning LED array heterodyne phase-shift range finder. The phase measurement used for obtaining depth is implemented by using the fast "four-bucket" algorithm. The design of a fast automatic gain control circuit obviously reduces the feedback response time and improves system measurement speed. Experimental tests for evaluation of the imaging system performance are described. Based on the theoretical analysis, a simplified signal-to-noise ratio model is proposed for guiding the design of this imaging system. Last, some issues requiring attention on constructing a large-pixel version of the system are also discussed. It was found that the range images can be acquired at a rate of 10 frames per second with a depth resolution better than ±5 mm in the range of 50 to 1000 mm.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.3462033