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Technical Documentation
opti-check
v2.8.2-K11
45/332 ipf electronic GmbH
Lüdenscheid, Germany
9.1.2 Coordinates (device dependant)
With the Vision Sensor, there is an option to convert the internal image coordinate system (which uses pixel
as its unit) to a user-defined coordinate system (e.g. using millimetres). To do this, it is necessary to specify
the real coordinates for a few data points in the image referenced to a world coordinate system in order to
teach the Vision Sensor the distance in your unit.
If you want to convert the coordinates, activate this option. Following configuration, the unit you have defined
can be selected as the [Units] option for the corresponding feature checks.
Process
1. Place a defined test image of your choice (e.g. graph paper) into the field of view of the sensor.
2. Activate: Convert image coordinates to world coordinates .
3. Mark at least four coordinates on the image with defined distances between them. Base this on your
defined test image. The order is not important.
To achieve high conversion accuracy, ensure that the marked coordinates:

are positioned in the image as precisely as possible,

are uniformly distributed throughout the image,

do not lie on one line.