Run the project to the SegmentFinder step to ensure
your project works correctly.
Define a line
segment model
To define a line segment model, perform the following:
Click on the Define segment
() toolbar button in the
Project toolbar.
On the image, click and hold at the end of the line segment that
you are defining; then, drag to the required length. Alternately,
set the Length
in the
Configuration pane.
Note that this does not set the Search angle.
Confirm or cancel the defined shape in the Segment control panel (
).
To redefine the segment, click the Redefine shape button in the
Configuration pane.
SegmentFinder step settings
The SegmentFinder step settings
control the search. Typically, the default settings are sufficient;
however you can specify other values if necessary. To change the
default SegmentFinder step settings,
perform one or more of the following:
Set the Total
number of occurrences, Smoothness, Detail level, Acceptance, and Polarity. Use these, and
other
Search settings available for all Finder steps, to further
control edge extraction and the definition and identification of a
match.
Note that the polarity setting is not applicable to the
SegmentFinder
step.
Set the Fit score
min. Use this to guarantee a certain quality of fit. The fit
score is a measure of the correlation of the edges in your model to
those in the occurrence. It is equal to [1 - Normalized Fit Error].
A perfect fit gives a fit score of 100.0. The fit error is
calculated the same way as in the ModelFinder
step. For more information on fit error, see the Fit
error subsection of the Determining
what is a match section in Chapter 13:
ModelFinder step.
Set the Coverage
min. Use this to set the minimum required amount that your
segment model must match a potential occurrence for it to be
considered an actual occurrence.
Enable or disable Consistent gradient. Use
this to find line segments with opposing gradient transitions along
their length. See the Consistent gradient section later in
this chapter for more information.