Chapter
5
Reference Manual
IVC-2D
220
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SICK AG • Advanced Industrial Sensors • www.sick.com • All rights reserved
Interactive Setups
Coordinate Alignment
The Coordinate alignment tool is used for calibrating the IVC-2D’s coordinate system, and
optionally for aligning the coordinate system to an external coordinate system (world
coordinates).
The calibration can be made with two different methods:
Linear
Compensates for perspective.
Non-linear
Compensates for perspective and lens distortion.
You select which method to use on the Advanced tab in the interactive setup window.
The result from the tool is a transform, which is used later by the 'Get calibrated point' tool
to get calibrated or aligned measurement values.
The transform is stored in a data block in the IVC-2D’s working memory. To avoid having to
re-align after restarting the camera, the result can be saved to the camera‘s flash memory
by using a 'Save data block to flash' tool.
Figure –The Coordinate alignment interactive setup window.
To create a transform with the Coordinate alignment interactive setup, do the following:
•
Print the calibration target and grab an image of it.
It is not necessary to have the entire calibration target in the image – only the centre
squares (with the dots) must be visible in the image. However, the more of the target
is visible, the better the accuracy in the transform.
The crosses around the target (A to D) do not need to be visible in the image at all.
•
If the IVC-2D’s coordinate system should be aligned to an external coordinate system,
import the world coordinates for the reference points (A to D on the calibration pat-
tern) into the interactive setup.
•
Fill in the width of each square in
Target spacing
, and if necessary adjust the threshold
value.