Refractive laser triangulation and photometric stereo in underwater environment

Hao Fan; Lin Qi; Yakun Ju; Junyu Dong; Hui Yu

doi:10.1117/1.OE.56.11.113101

6 November 2017 Refractive laser triangulation and photometric stereo in underwater environment

Hao Fan, Lin Qi, Yakun Ju, Junyu Dong, Hui Yu

Author Affiliations +

Optical Engineering, Vol. 56, Issue 11, 113101 (November 2017). https://doi.org/10.1117/1.OE.56.11.113101

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.

Citation Download Citation

Hao Fan, Lin Qi, Yakun Ju, Junyu Dong, and Hui Yu "Refractive laser triangulation and photometric stereo in underwater environment," Optical Engineering 56(11), 113101 (6 November 2017). https://doi.org/10.1117/1.OE.56.11.113101

Received: 13 June 2017; Accepted: 10 October 2017; Published: 6 November 2017

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