Advantech VisionNavi User Manual page 38

possible to make settings such as "Allow 10% of the current location" or "Set the cur-
rent value to the upper limit / lower limit" easily.
The right image shows the execution image of shape matching and the detection
result on the detailed setting screen of the tool.
X ·················X coordinate of the center (yellow "?" mark in the image)
Y ·················Y coordinate of center
Angle ···········Rotation angle to the model
Scale factor ···Size magnification for the model
Score ···········Approximate extent to which model is close
dx/dy············Moving distance from the detection position in the image used for
model image registration
All items in the detection result are used as judgment thresholds.
In the initial setting, there is a threshold value for OK judgment.
To change the threshold, click on the threshold name you want to change and carry
out.
Positioning-Edge
Positioning is performed using the extracted edge position.
As in the example below, it is suitable for positioning bag-like objects that are difficult
to match.
Positioning-Get result
Positioning is performed using the processing result of the previous tool.
For the previous tool, please place a tool that outputs position information (PosX and
PosY) by judgment, measurement, etc.
Distortion correction
An image is generated by correcting the distortion and deflection of the object using
the feature amount of the image, and positioning is performed.
For workpieces which tend to cause distortion such as rubber, it is possible to cancel
the distortion and to inspect burrs and defects.
Enter model
Register model image with standard workpiece. Registration method and parameters
used are the same as Positioning-Matching.
With the distortion correction tool, when the target work is deformed with respect to
the reference work, it is possible to extract the corresponding feature point and cor-
rect the image by deforming the image. Distortion correction
Substance / Spot inspection
2.5 Inspection
Substance / Spot inspection
Extract regions with large contrast difference from the background as defects and
judge the area of defects.
Detect condition
[Defect type]
Black defect
···················Extract the black (dark) part than the background as a defect.
White defect
···················Extract the white (bright) part than the background as a defect.
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