Photon Focus MV1-D2048-3D03 Series User Manual page 55

Smoothing is only used for the calculation of the position of the 3D-ROI in the
moving ROI feature but has no impact on the 3D data output of the camera.
Considerations in using moving ROI
The moving ROI feature should be considered if the horizontal position of the detected laser
line changes in the course of the detection. A typical case is the examination of flat surfaces:
the deviation of the laser line in every profile is rather small, but the vertical position of the
detected laser line might change due to vibrations or if the surface is not parallel to the
conveyor belt.
Gradual changes of the vertical position are optimal for the moving ROI feature. Abrupt
changes can be handled by the Laser Finder feature (see Section 5.2.16) at the cost of losing
some profiles.
The following steps should be considered when setting the parameters for moving ROI:
1. Turn off moving ROI and stop acquisition.
2. Specify the starting row (Peak0_MovingROIRangeY) and the height (Peak0_MovingROIRangeH) of
the laser finder window. This window should contain the minimal and the maximal
position of the laser line during the scanning process. This window should not be set
much bigger than required because the duration of the laser finder process (if it is
enabled) depends on the size of the laser finder window.
3. Specify the horizontal ROI position through the properties OffsetX and Width.
4. Specify the height (Peak0_3DH) and the starting position (Peak0_3DY) of the 3D-ROI. This
window should contain an individual profile and account for the movement of the laser
position from one profile to the next profile. The 3D-ROI must be fully contained in the
laser finder window, even if the laser finder feature is disabled (this is not enforced by the
software).
5. Set the position of the 2D-line (Peak0_2DY) outside of the laser finder window, even if you
are not using the information of the 2D line.
6. Set the value of Peak0_MovingROIMinCol even if you are not using laser finder. Rough rule
for setting this value: look at the detected laser profiles and estimate how many columns
(percentage of ROI width) contain a detected laser line. Take half or a third of it as the
value of Peak0_MovingROIMinCol. Example: if the laser line is visible in almost all columns
then a value of 50 would be appropriate for Peak0_MovingROIMinCol. If there are parts
where no laser line is detected (e.g. due to holes) then you should lower the value.
7. The laser finder should be used. Currently no situation is known where the use of the
laser finder is disadvised.
8. Smoothing is normally not required. It can be considered if the results without smoothing
are not satisfactory.
9. Turn on moving ROI.
No camera property should be read or written while aquisition is running and
moving ROI is enabled. Stop acquisition to access camera properties.
Consider to use the PeakFilterWidthMin functionality to filter out unwanted
peak coordinates (see also Section 5.2.13).
MAN052 12/2018 V3.2
5.2 3D Features
55 of 131