Journal
IEEE TRANSACTIONS ON COMPUTATIONAL IMAGING
Volume 9, Issue -, Pages 881-893Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCI.2023.3319983
Keywords
Light field imaging; underwater 3D reconstruction; underwater camera calibration
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This paper presents a light field-based approach for high-quality 3D reconstruction of underwater scenes from a single viewpoint. The method utilizes angular resampling of light field images and employs a fast approximation algorithm to handle non-linear refraction. Experimental results demonstrate that the proposed method achieves state-of-the-art reconstruction on both synthetic and real data.
Recovering 3D geometry of underwater scenes is challenging because of the non-linear refraction of light at the water-air interface, which is caused by the camera housing. We present a light field-based approach that leverages properties of angular samples for high-quality underwater 3D reconstruction from a single viewpoint. Specifically, we re-sample the light field image to angular patches. As underwater scenes exhibit weak view-dependent specularity, an angular patch tends to have uniform intensity when sampled at the correct depth. We thus impose this angular uniformity as a constraint for depth estimation. For efficient angular re-sampling, we design a fast approximation algorithm based on multivariate polynomial regression to approximate nonlinear refraction paths. We further develop a light field calibration algorithm that estimates the water-air interface geometry along with the camera parameters. Comprehensive experiments on synthetic and real data show our method produces state-of-the-art reconstruction of static and dynamic underwater scenes.
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