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116
Software Module
Property
Threshold
Gradient Pos
Threshold Gradient Pos defines the threshold of the positive gradi-
ent.
Note: The gradient represents the change of brightness from pixel to
the next. The higher the contrast of an edge the higher the gradient.
Threshold
Gradient Neg
Threshold Gradient Neg defines the threshold of the negative gradi-
ent.
Note: The gradient represents the change of brightness from pixel to
the next. The higher the contrast of an edge the higher the gradient.
Threshold
Outlier Dis-
tance
Maximum distance to the detected shape which must be maintained
by a point, in order for it to be used in the next iteration. Points which
are farther away than this distance are treated as outliers.
Fitting Itera-
tions
Number of best-fit calculations which are carried out in order that
the distance of the detected points on the search lines from the line
becomes as small as possible. Outliers are not used for subsequent
best-fit calculations.
Note: The larger the value, the more iteration steps are executed.
Under certain circumstances a shape can be more closely approxi-
mated as a result, but calculation time may be increased as well.
Search Ray
Length
Length of the search rays, along which an edge transition is
searched for.
Search Ray
Interval
Distance between the search rays, along which an edge transition
is searched for. Generally speaking, the use of several search rays
increases accuracy, but also requires more computing time.
Note: Enlarging the interval is especially effective for faster evalua-
tion.
Search Ray
Orientation
The direction of the search ray can be turned 180° with this setting.
Point Usage
[%]
The percentage indicates how many points will be used to ascer-
tain the line.
Point Usage
Strategy
The points which should be used to ascertain the line are specified.
Selection can be made between the first and the last points on the
search line. The search direction is made apparent by the direction
of the arrow in the search geometry in the image.
The detected line, which is defined by means of two points, is listed under found
geometry. The following settings/results are displayed for points 1 and 2:
X (px)
Coordinate of the sensor image coordinate system (see sec-
tion 18.3)
Y (px)
A search line is required in order to detect a line. This search geometry is also de-
fined by means of two points.
X (px)
Coordinate of the sensor image coordinate system (see sec-
tion 18.3)
Y (px)
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