Journal
OPTICS AND LASERS IN ENGINEERING
Volume 89, Issue -, Pages 138-144Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2016.08.019
Keywords
Fringe projection profilometry; High dynamic range imaging (HDRI); Shiny surface; High reflectance; Single-shot; Attenuation ratio calibration
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It is a challenging issue to get satisfied results in terms of 3D imaging for shiny surface with fringe projection profilometry (FPP), as the wide variation of surface reflectance for shiny surface will lead to bad exposure, which requires the high dynamic range imaging (HDRI) technique. HDRI with monochromatic illumination and single-shot raw data of the color camera is presented in this paper. From the single-shot raw data, 4 monochrome sub-images corresponding to R, G, G and B channels can be separated respectively. After the attenuation ratios between R&G, G&B channels are calibrated, an image with higher dynamic range can be synthesized with the 4 sub-images, which can help to avoid the impact of bad exposure and improve the accuracy of phase calculation. Experiments demonstrate the validity of proposed method for shiny surface. (C) 2016 Elsevier Ltd. All rights reserved.
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