Vision Sensor SBSI/SBSC-EN, 8062650 - 1607b - 13/09/2016
Page 171
Vision Sensor Manual
Overlay search region
Activate overlays for free shape search regions.
Overlay
Color marking of pixels inside or outside of specified color range.
This is a help during setup to vizualise detector results and to set
thresholds more accurate.
Color histogram
Offers possibility to enter the thresholds inside a color histogram.
1*) In the RGB- and LAB- color model the color distance is the euklidean distance.
In the color model LAB the distribution of colors is nearly homogenious over the entire model, that
means that color distances of the same value lead to the very equal cognition of color difference over the
entire model. That is why we can state that a distance of a value of >= 5 leads to a cognition of a different
color in this color model.
Predestinated applicaitons:
- Sorting of colored object via the list index
- Simple control of homogenious colored areas (average of color value over ROI, teach, adjust small color
distance (tolerance band) .. that´s it)
For newly generated detectors, all parameters are preset as standard values, suitable for many
applications.
4.6.3.15.2.1 Color histogram
Depending from selected color model there are displayed histograms for RGB, HSV or LAB. The
histogram shows the distribution of colors in region of interest. By the buttons there can be switched on
and off single channels. Limits for color detection can by set by moving small markings below the
histogram. The selected range of colors is shown by colored areas. Crossing the limits results in invertion
of the selection. If a color can be detected reliable by using only one channel, the other channels have to be
set to max./min. limits to avoid disturbing influence to detection.
Fig. 169: Color histogram
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