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Smart Camera / Vision-Sensor / 1D-/2D-Code-Scanner / OCR Reader
11.10.2.5.Measure Segment on Line Sub-Module
Objective
Segments are looked for along a line.
Procedure
First of all, activate the function in the toolbar. After the tool has been activated, a line
can be defined. The first click specifies the starting point, and the second click the end
point of the sought after line.
Edges are looked for on each of these lines in accordance with the settings for edge
width, positive threshold gradient, negative threshold gradient and segment bright-
ness (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.
Property
The following settings/results are displayed:
Segments
True Count
The number of detected segments is displayed.
Edge Width “Edge width” influences detection sensitivity for brightness fluctua-
tions.
Note:
• An edge width of 3 pixels reacts to even the smallest contrast
change in the image.
• An edge width of 9 pixels smooths the brightness profile over a
distance of 9 pixels and ignores small irregularities.
Threshold
Gradient Pos
[GrM]
Threshold Gradient Pos specifies the positive 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.
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
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