Laser Line Detection - Photon Focus MV0 3D06 Series User Manual

13.5 3D Features
The accuracy of the triangulation system is determined by the line extracting algorithm, the
optical setup, the quality parameters of the laser line generator and the parameters of the lens
which makes optical engineering necessary.
Triangulation Setup 1
In this setup the camera points at a viewing angle to the laser line projected from the top. A
larger angle leads to a higher resolution. With larger angles the range of height is reduced.
Small angles have the benefit of little occlusions.
Line Laser
Camera
Figure 13.3: Triangulation setup 1
Triangulation Setup 2
This setup shows an opposite configuration of the laser line and the camera. The resolution at
same triangulation angle is slightly higher but artefacts which occur during the measurement
at the borders of the object have to be suppressed by software.
Triangulation Setup 3
In this setup the laser line generator and the camera are placed in a more reflecting
configuration. This gives more signal and could be used for dark or matte surfaces. In case of
reflecting surfaces there is only a little amount of scattering which can be used as signal for
triangulation. Also in this case this triangulation setup helps to get results.
Triangulation Setup 4
In contrast to setup 3 this setup is used for high scattering material or for application where
strong reflections of the object have to be suppressed. The resolution is reduced due to the
relations of the angles and .

13.5.3 Laser Line Detection

The laser line detectors (LineFinder and COG) each take two threshold values as their input, a
signal threshold and a width threshold. The thresholds of the different algorithms are
configured seperately. They fulfill the following purposes:
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