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Introduction
User Guide: Share3D dashboard
Introduction
Getting started with the Dashboard
Models homepage
Adding metadata
Publishing
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User guide - to the Share 3D Storymaker
Getting started with the Storymaker
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3D process
Introduction to the 3D workflow
Data capture
Active systems: short range
Active systems: long to mid range
Passive systems: photogrammetry and other image based methods
Post-processing
Visual Enhancement
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Training course on 3D
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Active systems: short range
Two popular short range techniques are described on this page: Laser Triangular (LT) and Structured Light (SL).

Laser Triangulation

One of the most widely used active acquisition methods is Laser Triangulation (LT). The instruments used have both a laser source and an optical detector. The laser source emits light in the form of a spot, a line or a pattern on the surface of the object while the optical detector captures the deformations of the light pattern due to the surface’s morphology. The depth is computed by using the triangulation principle.
Laser scanners are known for their high accuracy in geometry measurements (<50µm) and dense sampling (<100µm). Current LT systems are able to offer perfect match between distance measurements and colour information. The method being used proposes the combination of three laser beams (each with a wavelength close to one of the three primary colours) into an optical fibre. The acquisition system is able to capture both geometry and colour using the same composite laser beam while being unaffected by ambient lighting and shadows.
Diagram illustrating the principles of laser triangulation (LT) based range devices.

Structured Light

Structured Light (SL) - also known as fringe projection systems - is based on projecting a sequence of different alternating dark and bright stripes onto the surface of an object and extracting the 3D geometry by monitoring the deformations of each pattern. By examining the edges of each line in the pattern, the distance from the scanner to the object’s surface is calculated by trigonometric triangulation.
Significant research has been carried out on the projection of fringe patterns that are suitable for maximizing the measurement resolution. Current research is focused on developing SL systems able to capture 3D surfaces in real-time. This is achieved by increasing the speed of projection patterns and capturing algorithms.
Diagram illustrating the principles of structured light (SL) measurement devices.
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Active systems: long to mid range
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Laser Triangulation
Structured Light