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Edges and Contours

Some tools use trace combs to find edges and contours. The trace combs guarantee a very selective edge tracing. You decide where and in what direction to search. That means you can set the tool to search only for specific edges. The disadvantage is that you need knowledge of orientation and image position of the measuring object. 

Here you find more information on  Trace combs.

Below you see the general basis for the tool set-up. This is separated in the following parts:

Parameters guiding trace combs



Start point/Center point

Either start point or center point are given for the trace comb’s base line


The base line length


The base line angle


The distance between the trace lines, given as a step length along the base line.

Parameters guiding trace lines and intensity profile calculation



Start position

Start of the trace lines relative to the base line

End position

Stop of the trace lines relative to the base line

Step length

The distance between the measuring points along the trace lines. In each point the image intensity is measured. The measured intensity points makes up the intensity profile. The standard step length is one pixel. Normally there is no purpose to have a larger step length than 1 pixel, but experience have shown that smaller step length 1/2 or 1/3 pixel will increase the accuracy.

Line width

This can be 0,1,2,…, and denotes the number of pixels looked at on each side of the trace line. Set the line width greater than zero to average several side-by-side values for each point on the trace line. This is very useful when there is noise and you want to improve the accuracy. The time of the analysis is linearly increasing with this parameter. 

Parameters guiding edge detection




Threshold for the edge detection. Either used to find edges as threshold crossings or to filter ripples when top/bottom detection is used (extreme values).

Edge type

Decides which combinations of tops/bottoms and threshold transitions you want to find.



Scorpion Vision Version XII : Build 646 - Date: 20170225
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