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Optical Engineering

Refractive laser triangulation and photometric stereo in underwater environment
Author(s): Hao Fan; Lin Qi; Yakun Ju; Junyu Dong; Hui Yu
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Paper Abstract

Laser triangulation and photometric stereo are commonly used three-dimensional (3-D) reconstruction methods, but they bear limitations in an underwater environment. One important reason is due to the refraction occurring at the interface (usually glass) of the underwater housing. The image formation process does not follow the commonly used pinhole camera model, and the image captured by the camera is a refracted projection of the object. We introduce a flat refraction model to describe the geometric relation between the refracted image and the real object. The model parameters were estimated in a calibration step with a standard chessboard. The proposed geometric relation is used for rebuilding underwater 3-D shapes in laser triangulation and photometric stereo. The experimental results indicate that our method can effectively correct the distortion in underwater 3-D reconstruction.

Paper Details

Date Published: 6 November 2017
PDF: 10 pages
Opt. Eng. 56(11) 113101 doi: 10.1117/1.OE.56.11.113101
Published in: Optical Engineering Volume 56, Issue 11
Show Author Affiliations
Hao Fan, Ocean Univ. of China (China)
Lin Qi, Ocean Univ. of China (China)
Yakun Ju, Ocean Univ. of China (China)
Junyu Dong, Ocean Univ. of China (China)
Hui Yu, Univ. of Portsmouth (United Kingdom)

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