Positioning Algorithm in Multi-Media Refractive Imaging System Based on Particle Swarm Optimization Calibration

Wenming, 张文明 Zhang; Xin, 王欣 Wang; Qiang, 张强 Zhang; Haibin, 李海滨 Li

doi:10.3788/aos201333.0515001

Cited by 1 publication

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“…However, geometric distortions resulted from a significant error caused by Snell's law in the stereo fisheye images. Zhang et al [17] applied the ray-tracing method to construct a target precise positioning model under multimedia conditions and performed particle swarm optimization to calibrate the parameters. Nevertheless, the approximate numerical solution ended up increasing the systematical error.…”

Section: Introductionmentioning

confidence: 99%

Calibration of underwater fisheye camera with multi-frequency heterodyne technique based on light field

Xie

Zhang

et al. 2020

Meas. Sci. Technol.

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In this paper, a novel approach is proposed to calibrate an underwater fisheye camera with the multi-frequency heterodyne technique based on the light field. First, an underwater fisheye camera imaging model based on the light field is established to demonstrate the multiple refractions of light in underwater propagation and the extraordinary imaging characteristics of the fisheye lens, which shows better conciseness and organization. Then, the calibration method applied in the underwater fisheye camera imaging system is proposed to determine the mapping of the light field and the pose of the underwater fisheye camera. The light field mapping of the fisheye lens is obtained with the assistance of the multi-frequency heterodyne technique. Finally, an underwater fisheye camera is developed and the experimental results are obtained to validate the correctness and feasibility of the proposed method. Our underwater imaging system proves capable of achieving higher accuracy in the context of underwater 3D measurement.

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Section: Introductionmentioning

confidence: 99%