Multiple-exposure adaptive selection algorithm for high dynamic range 3D fringe projection measurement

Haihua Cui; Zhaojie Li; Wei Tian; Wenhe Liao; Xiaosheng Cheng

doi:10.1117/12.2511918

7 March 2019 Multiple-exposure adaptive selection algorithm for high dynamic range 3D fringe projection measurement

Haihua Cui, Zhaojie Li, Wei Tian, Wenhe Liao, Xiaosheng Cheng

Proceedings Volume 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation; 110530M (2019) https://doi.org/10.1117/12.2511918
Event: 10th International Symposium on Precision Engineering Measurements and Instrumentation (ISPEMI 2018), 2018, Kunming, China

Abstract

In order to cover the high dynamic exposure range requirement of high reflective surface, a multiple-exposure adaptive selection algorithm of phase shifting 3D measurement is developed. At first, the camera response curve function is calibrated with the sequence images of different exposure times. The nonlinear curve function shows the relationship between the image intensity value and exposure amount. The relative irradiance value of all the image pixels is computed based on the linear relation between the exposure time and exposure amount. Both relative irradiance value cover the highest and lowest gray value of the fringe image is set the threshold. Then, the adaptive selection algorithm for exposure time is proposed based on the double threshold principle. At last, different exposure time node is selected adaptively. The sequences images with multi-exposure time are fused. In order to evaluate the performance of this method, some typical metal parts and blade with high range of reflectivity surfaces are used for 3D measurement and construction. The experiment results verify the feasibility of the proposed method.

Citation Download Citation

Haihua Cui, Zhaojie Li, Wei Tian, Wenhe Liao, and Xiaosheng Cheng "Multiple-exposure adaptive selection algorithm for high dynamic range 3D fringe projection measurement", Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 110530M (7 March 2019); https://doi.org/10.1117/12.2511918

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KEYWORDS

Cameras

3D metrology

Reflectivity

Structured light

Automatic exposure

Algorithm development

Calibration

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