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Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Three-Dimensional Reconstruction for the Whole Lung with Early Multiple Pulmonary Nodules
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Published on: October 13, 2023

Efficient sparse voxel octrees.

Samuli Laine1, Tero Karras

  • 1NVIDIA Research, Urho Kekkosen katu 3 B, FI-00100 Helsinki, Finland. slaine@nvidia.com

IEEE Transactions on Visualization and Computer Graphics
|November 3, 2010
PubMed
Summary
This summary is machine-generated.

This paper introduces an efficient voxel representation for complex geometry on GPUs. This method rivals triangle-based approaches in ray casting performance while offering superior geometric detail and shading capabilities.

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Area of Science:

  • Computer Graphics
  • Geometric Modeling
  • GPU Computing

Background:

  • Traditional triangle-based representations face limitations in handling complex geometry and detail.
  • Efficient rendering of feature-rich models on Graphics Processing Units (GPUs) remains a challenge.

Purpose of the Study:

  • To explore voxel representations as a versatile method for complex geometry on GPUs.
  • To develop and evaluate a novel voxel data structure and ray casting algorithm.
  • To enhance voxel representations with contour information, normal compression, and filtering techniques.

Main Methods:

  • Developed a compact data structure for efficient voxel storage.
  • Implemented an efficient ray casting algorithm tailored for the voxel structure.
  • Augmented voxel data with contour information for increased resolution and surface encoding.
  • Utilized a novel normal compression format for high-precision object-space normals.
  • Applied a variable-radius postprocess filtering for smoothing shading artifacts.

Main Results:

  • The proposed voxel representation demonstrates competitive ray casting performance against triangle-based methods.
  • Achieved significantly greater geometric detail and unique per-voxel shading information.
  • Novel contour information enhanced geometric resolution and surface encoding efficiency.
  • Normal compression and filtering techniques improved visual quality and performance.

Conclusions:

  • Voxel representations offer a powerful and competitive alternative to triangle meshes for complex geometry rendering on GPUs.
  • The presented techniques provide a robust framework for high-detail, efficient geometric representation and rendering.
  • The open-sourced codebase facilitates further research and development in voxel-based graphics.