Hardware manual

Impact Reference Guide Blob
3-69 Datalogic Automation Inc.
thus considered in-range. This setting is best used when looking for a bright part of an image with non-uni-
form grey levels. In this example, the lower threshold is approximately 50% and the upper threshold 100%.
Autothreshold Contrasting Dark Pixels
This sets the upper and lower thresholds automatically based on all the grey levels in the ROI. The lower
threshold is set to 0%, and the upper threshold is set to a value somewhere in the valley between the bright
pixel and the dark pixel peaks. The exact value depends on the statistics of the two peaks. Dark pixels are
thus considered in-range. This setting is best used when looking for a bright part of an image with non-uni-
form grey levels. In this example, the lower threshold is 0% and the upper threshold approximately 50%.
Autothreshold Uniform Region
This sets the upper and lower thresholds automatically based on a uniform region of grey levels in the ROI.
The lower threshold is set to the low end of the grey level values and the upper threshold is set high end of
the grey level values. Pixels outside the thresholds are thus considered out-of-range. This setting can be used
for flaw detection which looks for non-uniform areas in the image. In this example, the lower threshold is
approximately 20% and the upper threshold approximately 80%.
Fixed Threshold Range
This sets the upper and lower thresholds based on the Fixed Threshold Range input value. Pixels with grey
level values between the thresholds are considered in-range. This setting is best used for an image with uni-
form grey levels.
Center Fixed Threshold Range On Region Average
Threshold
Range
Lower
Threshold
Upper
Threshold
0100
Threshold
Range
Lower
Threshold
Upper
Threshold
0 100
Threshold
Range
Lower
Threshold
Upper
Threshold
0100