Rockwell Automation 5370-CVIM2 Module - Manual (Page 56)

5 Chapter Chapter 3
Image Acquisition Parameters
3–17
4. Enter scale factors –– For the Absolute calibration mode only, enter the
appropriate scale factors for each calibration gage.
5. “Pick and place” calibration gages –– For the Computed calibration
mode only, position the calibration gages over the workpiece image as
required. (For details, see Chapter 5, Pick and Place Functions.)
6. Set thresholds –– For the Computed calibration mode only, set the
threshold cursors to a point where the reference edges are optimized
along the X and Y calibration gages (For details, see Chapter 8,
Threshold, Filters, and Morphology.)
7. Select offsets –– For the Computed calibration mode only, select the
two offsets on each calibration gage that correspond to the desired points
between which the calibration measurements must take place.
8. Calibrate –– For the Computed calibration mode only, enter X– and
Y–axis dimensions and perform the “learn” functions.
9. Select scale factors –– For the Absolute calibration mode only, enter the
scale factors.
Image Setup
In preparation for the calibration procedure, you must acquire a camera
image of a “calibration object,” which can be any object whose dimensions
in the X and Y axes are accurate enough to be used as the basis for
calibrating the tools in your application. If the actual object to be inspected is
not available, you should use an object of similar size to perform the
calibration.
NOTE: You must select the camera resolution that you intend to use in your
application before performing the calibration procedure. If you were to
change the resolution selection after performing the calibration procedure,
you would need to repeat the procedure.
Selecting Calibrate Function
After acquiring a camera image of your calibration object, your next step is
to pick the
button on the appropriate Camera setup panel. When
you do, the Calibrate panel and the X– and Y–axis calibration “gages”
appear in the image field, as shown in Figure 3.11 (page 3–18).