Wenglor B50 - Page 90

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90
Software Module
Construction
Method
Segment on Arc
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 contrast
change in the image. An edge width of 9 pixels smooths the bright-
ness profile over a distance of 9 pixels and ignores small irregulari-
ties.
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
Sort Rule The rule used for sorting segments can be defined.
Position on
Search Geometry
The order in which the segments are found.
Size Segments are sorted by size in descending order.
Segment
Brightness
Bright Only bright objects are seen as segments.
Dark Only dark objects are seen as segments.
Segments
Max Count
Maximum number of segments to be expected in the search geom-
etry.
Orientation
Default The edge transition search direction corre-
sponds to the direction in which the search ray
has been drawn.
Swap The edge transition search direction is the op-
posite of the direction in which the search ray
has been drawn.