Hardware manual

Line Find Impact Reference Guide
Datalogic Automation Inc. 3-106
Line Find
See “Line Find” on page 3-75
Spot Find
In the Feature Finding Drawer
The Spot Find tool is an object or feature location tool. It detects uniformly bright (or dark) objects in an
image by finding the maximum (or minimum) average grey-level within a user-defined area. It creates an
output point list which contains the center locations of the detected objects. You can link this point list to the
Point Match Tool to check actual point locations against ideal locations. This tool is best used to locate
objects of a known size, such as balls in Ball Grid Arrays or pins in connectors.
To set up the Spot Find Tool
1. Link the desired image into the tool.
2. Use the Find Shape List ROI to define the tool search area, or link in the Shape List. This is the area
where the tool applies Maximum/Minimum grey-level averaging to look for objects.
3. Place the Spot Size ROI over an area slightly larger than the area that defines the desired spot to find.
4. Select the desired Spot Type. This indicates the type of spot to detect. If Find Bright Spots is selected,
the maximum average grey-level within the spot is found. If Find Dark Spots is selected, the minimum
average grey-level within the spot is found.
5. Select the Optimization type. For spots that are irregular in size and shape, select Find Spots Accu-
rately. The tool runs more slowly, but with better accuracy on spots of this type. To find spots that are
more uniform in size and shape, select Find Spots Quickly and the tool runs faster.
6. Set the Threshold input value. Grey-level values above this threshold (for bright objects) or below this
threshold (for dark objects) are excluded from the averages.
Subpixel Search
Distance in Pixels
The maximum distance, in pixels, from the threshold edge that the sub-
pixel algorithm searches for the subpixel edge. See “Subpixel Search
Distance” on page 3-125.
Enable Rise/Fall
Output
If True, the Edge Rise/Fall Indicator List output is populated.
Enable Number of
Edges Per Seg-
ment Output
If True, the Number of Edges Per Segment List output is populated.
Output Name What it is
Edge Transitions
List
A list of the x and y coordinates of all the edge point found
Edge Rise/Fall Indi-
cator List
A list of edges found, indicating whether the edge is rising or falling
True = rising, False = falling
Number of Edges
Per Segment List
Lists the number of found edges in each line segment
Input Name What it is