| This
tool finds one straight line using a trace comb.
A trace comb is used to localize the edge points. These
points are grouped and fitted into a line.
An optional smoothing is offered to reduce noise along the trace lines
of the trace comb.
Dark and light bands are identified and separated if the edge polarity
is specified.
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Setup
Reference - Reference system selection
Orientation - the tool's region of interest - Start point | Center point
- X - x coordinate of
roi
- Y - y
coordinate of roi
- Length - length of trace
line
- Angle -
angle of trace comb
Note : the orientation is Center point by default.
Trace lines
- Count - number of trace
lines
- Start point - position of
starting point on trace line given in reference coordinates
- Stop point - position
of end point on trace line given in reference coordinates
- Inverted the sign of start
and stop point will change the direction of the trace comb
- Trace step
- normally 1 - given in pixels
- Line width - 0 - trace line is not averaged - a higher value will
average N pixels perpendicular to the trace comb
Note : the direction of the tracelines can be changed changing the
polarity of start point and stop point
Point & Click Clipboard Support
The ROI can be managed by the buttons 
- Paste - paste the ROI from the image to the scorpion clipboard
- Copy - copy the ROI to the image from the scorpion clipboard
Point & Click Clipboard Support
 The
line defines the baseline of the traceline. The line defines the width and
the center of the tracecomb. To edit length of tracecomb used the tool's
length field.
One point will change the ROI center point.
Search criteria
- Threshold - the threshold or sensitivity of the edge detector -
a lower value increases the sensitivity
- Polarity - Light to dark | Dark to light
Advanced
Search parameters
- Search mode - Top | Threshold
- Fit tolerance - points outside tolerance is not accepted
- Tolerance given in pixels or reference coordinates
- More information - Line fit.
- Goodness (points) - minimum number of points fitted to line to be
accepted
- Risk (PPM) - typical value 1 - a lower value will increase the number
of iteration to find the line
Filter
- Smooth base - 3 is normally a good value
- Smooth counter - 1 default - given i pixels
- The smoothing increasing with higher values
- Differentiation
- 0 - give threshold
- 1 - 1. order differentiation - the derivative - default normally
used
- 2 - 2. order differentiation
Results
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Gradient
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Average
gradient along the line
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Line-fit
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Base
line angle
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Angle
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The
line angle
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Line
coverage
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Center
x,y
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Center
point of the fitted line
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Line
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Position
of the line
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Visualisation
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Base
line
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Base
middle normal
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Edge
line
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Edge
point clusters
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Fitted
edge points
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ScanRect
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Region
of interest
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Trace
lines
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Trace
line samples
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ExecuteCmd support - more information
executeCmd
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Command
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Parameters
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Return values
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Comments
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Set |
Object=ROI;Value=<center/baseline> |
ok,res |
Sets the tool's ROI. See Copy/paste
ROIs for details. |
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Get |
Object=ROI |
ok,<baseline> |
Current ROI baseline |
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