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.
Occlusions
Using the laser triangulation method, the laser may be unable to reach some parts of the object or the camera may be unable to view them. This is called occlusion.
| □ | On the left illustration, the camera does not see the bottom of the hole, inducing camera occlusion. |
| □ | On the right illustration, the laser does not reach the bottom of the hole, inducing laser occlusion. |
You can limit or avoid occlusions by using advanced scanning methods, for example by using two cameras or two lasers.