Underwater structured light reconstruction method and system based on polarization adaptive scattering suppression

By acquiring phase-shifted fringe image sequences at four polarization angles, and utilizing time-domain integration and low-rank sparse matrix decomposition models combined with an adaptive iterative algorithm, the problems of low fringe contrast and large phase error in underwater 3D measurement were solved, achieving high-precision underwater 3D reconstruction.

CN122156501AActive Publication Date: 2026-06-05EAST CHINA JIAOTONG UNIVERSITY
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Patent Information

Application Number
CN202610631845.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-09
Publication Date
2026-06-05
Estimated Expiration
2046-05-09

AI Technical Summary

Technical Problem

Existing underwater 3D measurement technologies suffer from low fringe contrast and large phase errors in environments with strong scattering and absorption. Traditional descattering methods rely on complex priors, leading to loss of fringe details and reconstruction failure, making them difficult to apply effectively in turbid waters.

Method used

By acquiring phase-shifted fringe image sequences at four polarization angles, and using time-domain integral averaging and a low-rank sparse matrix factorization model, combined with an adaptive iterative truncation mean algorithm, the backscattered light intensity distribution and transmission coefficient are estimated. The fringe image sequences are then corrected frame by frame to achieve phase unwrapping and three-dimensional reconstruction.

Benefits of technology

It significantly improves stripe contrast and phase measurement accuracy in high turbidity environments, effectively suppresses 3D reconstruction distortion caused by specular reflection, and achieves high-precision underwater 3D point cloud reconstruction.

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Abstract

The invention relates to an underwater structured light reconstruction method and system based on polarization adaptive scattering suppression. The method comprises the following steps: acquiring a phase shift fringe image sequence at four polarization angles; respectively carrying out time domain integral average processing on each phase shift stripe image sequence to obtain an average light intensity image of each polarization state; calculating an average polarization degree image and an average polarization angle image according to the average light intensity image, and performing low-rank sparse matrix decomposition on the average polarization degree image and the average polarization angle image to obtain a low-rank matrix; calculating back scattering light intensity distribution based on the low-rank matrix and the average light intensity image, estimating infinite background light intensity by adopting a self-adaptive iterative truncation mean algorithm, and further calculating a transmission coefficient of a scattering medium; and correcting the phase shift fringe image sequence frame by frame according to the backscattering light intensity distribution and the transmission coefficient, obtaining an absolute phase through phase unwrapping, and reconstructing the three-dimensional point cloud of the underwater object to be measured. According to the invention, scattering and reflection interference can be effectively suppressed in a strong-scattering, high-turbidity and high-reflection underwater environment, and the robustness and precision of three-dimensional reconstruction are improved.
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