Underwater Imaging Techniques for 3D Reconstruction
Summary
Underwater environments pose unique challenges to three-dimensional (3D) reconstruction owing to light attenuation, scattering by suspended particles and refractive distortion at the water–camera interface. Broadly, techniques fall into active and passive categories. Active methods employ controlled illumination—such as laser stripes, fringe projection or structured-light patterns—to retrieve depth via triangulation, offering high accuracy at close range but often limited by turbidity and power consumption. Passive approaches exploit natural or ambient illumination with multiview photogrammetry and structure-from-motion pipelines, which can survey larger areas but require sophisticated algorithms to compensate for poor contrast and refractive effects. Recent progress has focused on refined calibration models that explicitly address refraction through flat or domed ports, ray-based sensor modelling and hybrid pipelines that combine active depth sampling with passive image matching. These advances are driving applications in marine archaeology, ecological monitoring, underwater robotics and industrial inspection by enabling centimetre- to millimetre-scale accuracy in challenging subaqueous settings.
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Underwater Imaging Techniques for 3D Reconstruction publication trend
The graph below shows the total number of articles in underwater imaging techniques for 3d reconstruction across all publications each year (not limited to Nature Index journals).
Technical terms
Refraction: Bending of light as it passes between media of different density, causing geometric distortion in images.
Triangulation: Geometric method to compute 3D coordinates by intersecting rays from two or more viewpoints.
Structured light: Active technique that projects known patterns onto a scene to infer depth from deformation of the pattern.
Structure-from-motion: Passive reconstruction approach using multiple overlapping images to jointly estimate camera motion and 3D scene geometry.
Dome port: Spherical glass or acrylic window fitted on underwater housings to minimise refractive distortion and expand field of view.
Axial camera model: Camera model that accounts for refraction by treating the interface as an axial projection surface rather than a single viewpoint.
References
- Underwater Laser Scanner: Ray-Based Model and Calibration. IEEE/ASME Transactions on Mechatronics (2019).
- Refractive Two-View Reconstruction for Underwater 3D Vision. International Journal of Computer Vision (2019).
- Refractive geometry for underwater domes. ISPRS Journal of Photogrammetry and Remote Sensing (2022).
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