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Open AccessArticle

Adaptive Binocular Fringe Dynamic Projection Method for High Dynamic Range Measurement

by Changzhi Yu 1, Fang Ji 1,*, Junpeng Xue 2,* and Yajun Wang 3
1
Institute of Mechanical Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621999, China
2
School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China
3
State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(18), 4023; https://doi.org/10.3390/s19184023
Received: 15 July 2019 / Revised: 8 September 2019 / Accepted: 14 September 2019 / Published: 18 September 2019
(This article belongs to the Special Issue Sensors for Precision Dimensional Metrology)
Three-dimensional measurement with fringe projection sensor has been commonly researched. However, the measurement accuracy and efficiency of most fringe projection sensors are still seriously affected by image saturation and the non-linear effects of the projector. In order to solve the challenge, in conjunction with the advantages of stereo vision technology and fringe projection technology, an adaptive binocular fringe dynamic projection method is proposed. The proposed method can avoid image saturation by adaptively adjusting the projection intensity. Firstly, the flowchart of the proposed method is explained. Then, an adaptive optimal projection intensity method based on multi-threshold segmentation is introduced to adjust the projection illumination. Finally, the mapping relationship of binocular saturation point and projection point is established by binocular transformation and left camera–projector mapping. Experiments demonstrate that the proposed method can achieve higher accuracy for high dynamic range measurement. View Full-Text
Keywords: three-dimensional measurement; high dynamic range; structured light sensor; adaptive binocular fringe dynamic projection; binocular calibration three-dimensional measurement; high dynamic range; structured light sensor; adaptive binocular fringe dynamic projection; binocular calibration
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Yu, C.; Ji, F.; Xue, J.; Wang, Y. Adaptive Binocular Fringe Dynamic Projection Method for High Dynamic Range Measurement. Sensors 2019, 19, 4023.

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