Rockwell Automation 5370-CVIM2 Module - Manual (Page 268)

Chapter 7
Inspection Tools
7–30
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Ellipse –– The axes of an elliptical window are always aligned with the
vertical and horizontal axes of the image field.
•
Arc Ring –– The arc ring window consists of a concentric outer and inner
arc ring, connected at each end of the arc, and a separate rectangular
“destination” window. The image area between the arc rings is
“unwrapped” and displayed in the destination window.
•
Polygon –– A polygonal window can have any number of sides from
three to 16. You can configure a polygonal window so that it conforms to
virtually any shape.
The arc ring “shape” window has unique capabilities that differ from the
functions of the other window shapes (rectangle, ellipse, circle, and
polygon). In particular, an arc ring window can perform an “unwrap”
function, which can be used to examine circular features and, by
“unwrapping” them, process them as though they were linear.
An arc ring window consists of a circular “image” window and a rectangular
“destination” window. The image window consists of an outer arc and a
concentrically positioned inner arc, with the two ends connected. The arc
size (in degrees) can be increased to 360
°, or decreased to a size (in degrees)
that varies with the radius of the inner arc.
Figure 7.26 illustrates the unwrapping effect of an arc ring window, with the
circular array of letters in the image window appearing as a linear array in
the destination window.
Figure 7.26 Example: Unwrapping Effect of Arc Ring Window
The pick and place procedure for the arc ring window is comparable to the
procedure for arc gages, while the pick and place procedure for the
destination window is the same as for rectangular windows. For details, refer
to Chapter 5, Pick and Place Functions.