Wenglor B50 - Page 91

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Smart Camera / Vision-Sensor / 1D-/2D-Code-Scanner / OCR Reader
Construction
Method
Segment on Circle
The construction method is the same as for “edge on line”. The difference is that
adjacent segments are looked for in the search geometry. The beginning or end of a
segment is defined by an edge. The search for edges corresponds to the search used
with the “edge on line” construction method.
Segments
True Count
The number of segments detected in the search geometry is dis-
played. The upper and lower thresholds can be adjusted manually.
Edge Width “Edge width” influences detection sensitivity for brightness fluctua-
tions.
Note: An edge width of 3 pixels reacts to even the smallest con-
trast 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 accep-
tance 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
The order in which the segments are found
relative to the zero angle.
Size Segments are sorted by size in descending
order.