Laser Triangulation
In a laser-line triangulation system, a laser line is projected on the object to measure. A camera is looking at the laser line from a different point of view. The line deformation observed by the camera contains the shape information of the measured object.
The scanning of the object consists in moving it under the laser line and recording multiple images.
From the scanning you can reconstruct its 3D shape.
Using the laser triangulation method, there are parts of the object that will either not be reachable for the laser or not be visible by the camera. This is called occlusion.
Occlusions can be circumvented by using advanced scanning methods like using two cameras or two lasers.
| ● | On the left figure, the camera cannot see the bottom of the hole, inducing camera occlusion. |
| ● | On the right figure, the laser can’t reach the bottom of the hole, inducing laser occlusion. |