作者
Shijie Feng, Yuzhen Zhang, Qian Chen, Chao Zuo, Rubin Li, Guochen Shen
发表日期
2014/8/1
期刊
Optics and Lasers in Engineering
卷号
59
页码范围
56-71
出版商
Elsevier
简介
This paper presents a general solution for realizing high dynamic range three-dimensional (3-D) shape measurement based on fringe projection. Three concrete techniques are involved in the solution for measuring object with large range of reflectivity (LRR) or one with shiny specular surface. For the first technique, the measured surface reflectivities are sub-divided into several groups based on its histogram distribution, then the optimal exposure time for each group can be predicted adaptively so that the bright as well as dark areas on the measured surface are able to be handled without any compromise. Phase-shifted images are then captured at the calculated exposure times and a composite phase-shifted image is generated by extracting the optimally exposed pixels in the raw fringes images. For the second technique, it is proposed by introducing two orthogonal polarizers which are placed separately in front …
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