Hardware manual

Impact Reference Guide Origin
3-83 Datalogic Automation Inc.
Central Rising Edge: Detects the central point of the dark to light transition
Central Falling Edge: Detects the central point of the light to dark transition
First Rising Edge: Detects the first dark to light transition
First Falling Edge: Detects the first light to dark transition
Automatic: Detects transitions based on the "...Object Color to Find" property setting
Centering Method and Point Numbers
Points found on the ROI are counted from the beginning of the ROI. The first point found on the ROI is
number one. The Point Number property value determines which of the points is used to determine the ori-
gin.
No Centering: One point is used to determine the origin on the ROI. That point is indicated by the Point
Number property.
Center With Point Numbered From Start: The Point Number property is used to determine the starting
point for centering. It uses the Point Number For Centering property to determine the ending point for cen-
tering. For example, if the Point Number is 1 and the Point Number for Centering is 20, the origin is cen-
tered between the first point, counting from the beginning of the ROI, and the 20th point, also counting from
the beginning of the ROI.
Center With Point Numbered From End: The Point Number property is used to determine the ending
point for centering. The Point Number For Centering property is used to determine the beginning point for
centering. For example, if the Point Number is 1 and the Point Number for Centering is 5, the origin is cen-
tered between the 5th point, counting from the end of the ROI, and the first point, counting from the begin-
ning of the ROI.
To center the origin between the first and last points on an ROI
1. For Centering Method, select Center With Point Numbered From End
2. For the Primary Point Number property, enter a value of 1
3. For the Point Number For Centering Property, enter a value of 1
Threshold Method
Adaptive Threshold: The tool finds the peak grey level and automatically sets the threshold between the
dark and bright areas of the image depending on the statistics of the two areas. It then checks where pixels
fall within that range of grey levels to find edges. You can also apply a threshold offset to weight the adap-
tive threshold up or down. This threshold type allows the system to ignore small fluctuations in lighting,
since the threshold moves automatically.
Fixed Threshold: The threshold is fixed at the Fixed Threshold Percentage value.