Wenglor B50 - 7.Measure Segment on Arc Sub-Module

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Smart Camera / Vision-Sensor / 1D-/2D-Code-Scanner / OCR Reader
Property
Threshold
Gradient Neg
[GrM]
Threshold Gradient Neg specifies the negative gradient acceptance
threshold.
Note: The gradient corresponds to the change in brightness from
one pixel to the next. The higher the edge’s contrast, the larger the
gradient.
Segments
Max Count
Maximum number of segments to be expected.
Segments
Minimum
Length
Minimum length of the segments
Segments
Maximum
Length
Maximum length of the segments
Sort Rule The rule used for sorting segments can be defined.
Position on Search
Geometry
Sorting is based on the position on the
search ray. The results depend on the
orientation setting.
Size [Longest First] Segments are sorted in descending order
beginning with the longest segment.
Size [Shortest First] Segments are sorted in ascending order
beginning with the shortest segment.
Segment
Brightness
This setting specifies whether bright or dark segments will be
evaluated.
Orientation The search direction can be turned 180° with this setting.
11.10.2.7.Measure Segment on Arc Sub-Module
Objective
Segments are looked for on an arc.
Procedure
First of all, activate the function in the toolbar. Specify the center of the arc by clicking
the desired point. The second click defines the starting angle and the third click the
end angle, thus resulting in an arc.
Edges are looked for on the arc in accordance with the settings for edge width, positive
threshold gradient, negative threshold gradient and segment brightness (see section
11.4.3.2).
The detected edges serve as starting and end points of the various segments. There
are different parameters which influence the number and length of the segments to be
detected.