Rockwell Automation 5370-CVIM2 Module - Manual (Page 218)

5 Chapter Chapter 6
Reference Tools
6–59
The feature window should be positioned so that it covers the smallest
possible region that contains a feature with a distinct pattern (such as an
index mark) –– one that will not be mistaken for another region of the
destination image.
NOTE: The unwrapped image in the destination window represents more
than 360
° of the original image. This ensures that the destination image
contains a complete feature, even when that feature is located near the 0
°
point.
After the feature window has been properly positioned in the destination
window, the feature window’s image must be saved under an appropriate file
name. The
Image Manager panel can then be exited.
When the tool edit panel reappears, the Image Name field contains the file
name of the newly created image file (assuming that a different file name
was not selected), as shown in Figure 6.50. In addition, the
Passes field and
the two “pass” buttons are now active.
Figure 6.50 Example: Tool Edit Panel After Selecting Image File Name
The rotation finder tool must be configured so that the feature window makes
either one or two “passes” through the destination window as it searches for
a match to the stored feature image (the “index mark”). In most cases, two
passes are more efficient than one pass: The first pass locates the feature
approximately, after which the second pass locates the feature more precisely,
but with a smaller region to search.
The choice of Single Pass or Double Pass depends the details of your
application; thus, some trial and observation may be required in order to
determine which choice is the most effective and efficient. In all cases, the
objective is to optimize the search process for the best combination of speed
and accuracy.
The “pass” parameters are configured in the First Pass and Second Pass
panels, and these panels are selected by picking the and
buttons, respectively.
For complete details about the pass parameters and configuration, refer to the
Reference Window Tool section of this chapter, starting at the Single Pass vs
Double Pass heading on page 6–34.