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Optical Engineering

Real-time range imaging system based on a light-emitting diode array phase-shift range finder for fast three-dimensional shape acquisition
Author(s): Huanqin Wang; Jun Xu; Deyong He; Tianpeng Zhao; Hai Ming; Deyi Kong
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Paper Abstract

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.

Paper Details

Date Published: 1 July 2010
PDF: 9 pages
Opt. Eng. 49(7) 073201 doi: 10.1117/1.3462033
Published in: Optical Engineering Volume 49, Issue 7
Show Author Affiliations
Huanqin Wang, Institute of Intelligent Machines (China)
Jun Xu, Univ. of Science and Technology of China (China)
Deyong He, Univ. of Science and Technology of China (China)
Tianpeng Zhao, Univ. of Science and Technology of China (China)
Hai Ming, Univ. of Science and Technology of China (China)
Deyi Kong, Institute of Intelligent Machines (China)

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