8.6
Edge Tool
Use the Edge tool to detect and count
transitions
between bright and dark pixels (edges).
The Edge tool counts the total number of edges, and determines the
position
of each edge. Edge
position
information
can be used for
distance or angle measurements when used with a Measure tool.
Example
applications:
• Measure the height and width of a part
• Count the pins on an integrated circuit
• Measure the height of a needle
• Measure the
deflection
of an
automotive
gauge
• Detect the edge of a web
• Verify that a
bottle
cap is on completely
8.6.1 Edge Tool: Input Parameters
Use the Input parameters to
configure
how the tool analyzes an image.
Figure 144. Edge Tool—Input Parameters
ROI
The Region of Interest (ROI) is the
user-defined
group of pixels in the image that the sensor analyzes.
Figure 145. ROI Parameters
The ROI is a line of pixels that can be shortened, lengthened, or widened as needed for the
inspection.
Tool analysis follows the
direction
of the arrow. Set the width and the sample rate for the region of interest. The ROI
automatically
displays on the Image pane
when a tool is added.
ROI Width
An ROI can be as large as the
entire
Field of View (FOV).
Note that:
• Narrow ROIs execute faster but could miss the edge
• Wide ROIs are more consistent but don't execute as fast
• A wide ROI provides an average
value/location,
which results in improved repeatability
• The ROI must be 13 pixels or wider to calculate the
rotation
of a part (Locate tool only)
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