Chapter
5
Reference Manual
IVC-2D
218
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SICK AG • Advanced Industrial Sensors • www.sick.com • All rights reserved
Interactive Setups
Find Line Edge
This tool evaluates the changing of gray scale values along a user defined straight line. This
enables to detect transitions/changes of gray scale values along the line. The tool offers
two evaluation methods to detect transitions/changes of gray scale values. You find the
introduction of this tool in “Find line edge”.
Figure – Screenshot of interactive setup Find line edge. Upper left: input boxes for Input
Parameters; upper right: displayed image with line and found transition points (red crosses)
as overlay; lower left: result table with the coordinates of the found points; lower right: plots
of a relative histogram, gray scale values and derivation of gray scale values along the line.
How to set Input Parameters:
Type the number of the source bank holding the desired image for evaluation and the
destination bank where the image, the line, and the found points are to be plotted. Make
sure that the evaluation bank is different from the destination bank.
Select the geometrical interpretation for the start and end points of the line by clicking the
input box with the caption Type. Select one of the three available options. The values are
shown in the four input boxes with the caption Line coordinates. Note that depending on
the selected geometrical interpretation the Line end X and Line end Y values have different
interpretations like delta X /delta Y or length and angle. You can setup the lines length and
position by directly editing the values in the input boxes, or more conveniently by using a
drag-and-drop operation. To use a drag-and-drop operation click the start or end point of
the line in the image and drag this point to the desired position. The starting point of the
line is indicated with a yellow dot.
To select the Evaluation Method select one of the options for threshold types.
Single meaning: Evaluation Method 1: Detect relative change of gray scale values,
Multiple meaning: Evaluation Method 2: Detect absolute change of gray scale values.
Depending on the chosen Evaluation Method set just one of or both the upper and lower
gray scale threshold values by typing or selecting the values. A third option to set the
threshold is to move a horizontal line with the left mouse button in the plot of the gray
