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Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Photorealistic Learned Landscapes for Augmented Reality
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Gaussian splashing enables direct volumetric rendering underwater.

Nir Mualem1, Roy Amoyal2, Oren Freifeld2

  • 1The Stein Faculty of Computer and Information Science, Ben-Gurion University of the Negev, Beer-Sheva, Israel. nirmu@post.bgu.ac.il.

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Gaussian Splashing significantly speeds up 3D reconstruction for underwater scenes. This new method enhances 3D Gaussian Splatting (3DGS) for clearer, faster underwater imaging.

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Area of Science:

  • Computer Vision
  • Robotics
  • Photogrammetry

Background:

  • Underwater imaging is challenging due to light scattering and occlusion.
  • Existing 3D reconstruction methods like NeRFs and 3DGS perform poorly in underwater environments.
  • Previous underwater adaptations of NeRFs offer high quality but are impractically slow.

Purpose of the Study:

  • To develop a fast and high-quality 3D reconstruction method for underwater scenes.
  • To adapt 3D Gaussian Splatting (3DGS) for effective underwater scene representation.
  • To address limitations in rendering speed and reconstruction time for underwater 3D modeling.

Main Methods:

  • Introduced Gaussian Splashing, unifying 3DGS speed with a scattering-aware image formation model.
  • Innovated rendering and depth estimation procedures tailored for underwater conditions.
  • Developed a new loss function for 3DGS to improve underwater scene reconstruction.

Main Results:

  • Achieved reconstruction times in minutes, a significant improvement over previous methods.
  • Enabled novel underwater scene rendering at 140 FPS, drastically increasing speed.
  • Demonstrated competitive reconstruction quality across datasets, particularly for distant details affected by backscatter.

Conclusions:

  • Gaussian Splashing offers a practical and efficient solution for underwater 3D reconstruction.
  • The method effectively handles scattering and occlusion, improving detail preservation.
  • This advancement enables faster and more detailed exploration and analysis of underwater environments.