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Vision Sensor SBSI/SBSC-EN, 8062650 - 1607b - 13/09/2016
Vision Sensor Manual
zone masked with the "Edit search region / Function: Mask" (even masked zones
inside the image / search region)
Detector BLOB, Boundary BLOBs (Page 125)
Search region
Search region can be set to: "Rectangle", "Circle" or "Free shape". In mode "Free
shape" the function "Edit search region" is active.
Edit search region
Using the "Edit search region" button the dialog window to edit the search region
can be opened.
Overlay BLOBs
"Valid BLOBs": all valid BLOBs which fulfill the filter criteria are marked in green.
With this selection invalid BLOBs are marked in red.
"BLOB contour": all valid BLOBs (all BLOBs fulfilling the filter criteria) are marked
with a green contour line. With this selection invalid BLOBs are not marked.
Histogram
The Histogram button opens the Histogram window for the BLOB.
BLOB, tab Binarization, Histogram (Page 127)
4.6.3.8.3 Detector BLOB, tab Binarization, Dynamic threshold
In this tab all parameters for binarization with dynamic threshold can be set. The dynamic threshold can be
used if BLOBs / objects and background do have clearly different grey value ranges, and illumination
conditions are changing uniformly over the whole image.
If the brightness of the image changes uniformly, with the dynamic threshold limits are readjusted
automatically. (With absolute threshold those limits must be readjusted manually.)
Please note:
The Dynamic threshold is newly calculated with each new image / evaluation.
Please consider that fluctuating illumination, surface- reflectivity, etc. may influence the result!
Fig. 120: Detector BLOB, tab Binarization, Dynamic threshold
Parameters with selection "Dynamic Threshold"
Parameter
Function
Dynamic threshold
Dynamic threshold is automatically set to an statistically optimised position in
order to distinguish between fore- and background.
Brightness
Definition if BLOB is brighter or darker compared to the background
Summary of Contents for SBSC-EN
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