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LineEdgeFinder - 8
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.  

 

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

Gradient

Average gradient along the line

Line-fit

 

Base line angle

 

Angle

The line angle

Line coverage

 

Center x,y

Center point of the fitted line

Line

Position of the line



Visualisation

Base line

 

Base middle normal

 

Edge line

 

Edge point clusters

 

Fitted edge points

 

ScanRect

Region of interest

Trace lines

 

Trace line samples

 


ExecuteCmd support
- more information executeCmd

Command

Parameters

Return values

Comments

Set Object=ROI;Value=<center/baseline> ok,res Sets the tool's ROI. See Copy/paste ROIs for details.
Get Object=ROI ok,<baseline> Current ROI baseline
 

Scorpion Vision Version XII : Build 646 - Date: 20170225
Scorpion Vision Software® is a registered trademark of Tordivel AS.
Copyright © 2000 - 2017 Tordivel AS.