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Vision Sensor SBSI/SBSC-EN, 8062650 - 1607b - 13/09/2016
Page 103
Vision Sensor Manual
Position check
Checks whether the sample found is in the right position.
If position check is activated, the authorised zone for the position of the found
parameter is shown in a blue frame (either rectangular or elliptic). The centre
(green cross) of the parameter found must be situated inside the blue frame.
Pattern
Taught sample with display of the edges found
Edit contour
By edit contour there can be masked out parts of the search area. The parts which
are not relevant for this examination can be painted out like using an eraser. Masks
can also be inverted, means that parts which are interesting can be marked. S. also
chap.
Lock
Lock / Unlock Pattern: In locked status the taugth pattern is protected against
(unintentional / accidential) changing. by e.g. modification of the teach region. Unlock
to modify taught pattern..
For newly generated detectors, all parameters are preset as standard values, suitable for many
applications.
Optimisation:
Execution speed:
l
Search zone for position (yellow frame) only as large as necessary. Please note: The contour is found
as long as the centre point of the pattern is inside the search area!
l
Search zone for angle only as large as necessary
l
Search zone for scale only as large as necessary
l
Reduce resolution to CGA instead of VGA (Attention: Global parameter, affects all detectors!)
l
Set “accurate – fast” to fast
l
Increase value “Min. contrast pattern”. Take care that the relevant contours are still visible in the
display.
l
Increase value “Min. contrast Image”.
l
Especially in case of alignment: Use alternate reference pattern. E.g. with higher contrast, that “Min.
contrast pattern” and Min. contrast image” can be increased.
Robust detection:
l
Search zone for position (yellow frame) sufficiently large?
l
Search zone for angle sufficiently large?
l
Search zone for scale sufficiently large?
l
Contrasts for model and image suitably set? (for model visible in sample)
l
Set “accurate – fast” to accurate
l
Are there some and overlapping objects in the image?
l
Distinctive edges available?, re-teach if necessary
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