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JRM Vol.31 No.4 pp. 603-611
doi: 10.20965/jrm.2019.p0603
(2019)

Paper:

Underwater Structure from Motion for Cameras Under Refractive Surfaces

Xiaorui Qiao, Atsushi Yamashita, and Hajime Asama

The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Received:
January 6, 2019
Accepted:
May 13, 2019
Published:
August 20, 2019
Keywords:
refraction, structure from motion, underwater 3D reconstruction, waterproof housing
Abstract
Underwater Structure from Motion for Cameras Under Refractive Surfaces

Refractive camera pose estimation

Structure from Motion (SfM), as a three-dimensional (3D) reconstruction technique, can estimate the structure of an object by using a single moving camera. Cameras deployed in underwater environments are generally confined to waterproof housings. Thus, the light rays entering the camera are refracted twice; once at the interface between the water and the camera housing, and again at the interface between the camera housing and air. Images captured from scenes in underwater environments are prone to, and deteriorate, from distortion caused by this refraction. Severe distortions in geometric reconstruction would be caused if the refractive distortion is not properly addressed. Here, we propose a SfM approach to deal with the refraction in a camera system including a refractive surface. The impact of light refraction is precisely modeled in the refractive model. Based on the model, a new calibration and camera pose estimation method is proposed. This proposed method assists in accurate 3D reconstruction using the refractive camera system. Experiments, including simulations and real images, show that the proposed method can achieve accurate reconstruction, and effectively reduce the refractive distortion compared to conventional SfM.

Cite this article as:
X. Qiao, A. Yamashita, and H. Asama, “Underwater Structure from Motion for Cameras Under Refractive Surfaces,” J. Robot. Mechatron., Vol.31, No.4, pp. 603-611, 2019.
Data files:
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Last updated on Nov. 08, 2019