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Software Module
Edge Point The coordinates of the detected edge transition are
displayed under “Edge Point”:
X (px) Coordinate of the image sensor coordinate system
(see section “18.3. Coordinate system” on page
195)
Y (px)
The search line, with which the edge transitions can be found, is
defined by means of two points which are specified with their X
and Y coordinates. The following settings/results are displayed for
points 1 and 2 under “Search Ray”.
X (px) Coordinate of the image sensor coordinate system
(see section “18.3. Coordinate system” on page
195)
Y (px)
Orientation
Default The edge transition search direction corresponds to
the direction in which the search ray has been drawn.
Swap The edge transition search direction is the opposite
of the direction in which the search ray has been
drawn.
Construction
Method
Segment on Line
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.
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