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Related Experiment Video

Updated: Jan 28, 2026

Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
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Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging

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Adaptive Structured Light with Scatter Correction for High-Precision Underwater 3D Measurements.

Petter Risholm1, Trine Kirkhus2, Jens T Thielemann3

  • 1Smart Sensor Systems, SINTEF Digital, Forskningsveien 1, 0314 Oslo, Norway. petter.risholm@sintef.no.

Sensors (Basel, Switzerland)
|March 3, 2019
PubMed
Summary

This study presents a new multi-frequency phase stepping method for high-precision underwater 3D imaging in turbid water. The technique improves accuracy and reduces errors compared to traditional methods.

Keywords:
multi-frequency phase steppingscatter correctionstructured lightuncertaintyunderwater

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Area of Science:

  • Robotics and Automation
  • Optical Engineering
  • Oceanography

Background:

  • Automating subsea inspection, maintenance, and repair (IMR) operations requires high-precision underwater 3D cameras.
  • Turbid water conditions significantly degrade the performance of existing 3D imaging systems.

Purpose of the Study:

  • To develop a novel multi-frequency phase stepping method for accurate 3D estimation in turbid underwater environments.
  • To address challenges posed by light scattering in subsea imaging.

Main Methods:

  • Implementation of a multi-frequency phase stepping (structured light) technique.
  • Development of an adaptive phase-unwrapping procedure utilizing phase-uncertainty.
  • Application of an unsharp filter for forward scatter correction and a model-based method for backscatter removal.

Main Results:

  • The proposed scatter correction effectively mitigates the adverse effects of light scattering on phase estimates.
  • Adaptive frequency unwrapping, combined with scatter correction, yields improved image accuracy and precision.
  • The new method demonstrates fewer phase unwrap errors compared to the Gray-Code Phase Stepping (GCPS) approach.

Conclusions:

  • The novel multi-frequency phase stepping method offers a robust solution for high-precision underwater 3D reconstruction in challenging conditions.
  • This advancement is crucial for enhancing the automation of subsea IMR operations.