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Find Edges Controls

Main Tab

The following controls are available on the Main tab.

Control Name	Description
Step Name	Name to give the step.
Region of Interest	The region of interest you want to use for the step.
Reposition Region of Interest	When enabled, the step dynamically repositions the region of interest based on a coordinate system you built in a previous step.
Reference Coordinate System	Coordinate system to which you want to link the region of interest.

Setting Tab

The following controls are available on the Settings tab.

Control Name	Description
Look For	Specifies the type of edges to find in the image. The following options are available: All Edges—Finds all edges of the specified polarity along the search line. First Edge—Finds only the first edge of the specified polarity along each independent search line based on the direction of the search line. First & Last Edge—Finds only the first and last edges of the specified polarity along each independent search line. Best Edge—Finds only the best edge of the specified polarity along each independent search line.
Edge Polarity	Specifies the pixel intensity transitions to use to determine edges. The following options are available: All Edges—Finds edges characterized by dark-to-bright and bright-to-dark pixel intensity transitions. Dark to Bright Only—Finds only those edges characterized by dark-to-bright pixel intensity transitions along the direction of the search line. Bright to Dark Only—Finds only those edges characterized by bright-to-dark pixel intensity transitions along the direction of the search line.
Auto Setup	When enabled, the step determines a set of parameters optimized to locate all edges in the region of interest automatically, regardless of polarity.
Minimum Edge Strength	Minimum difference in the intensity values between the edge and its surroundings.
Kernel Size	Specifies the size of the edge detection kernel.
Projection Width	Specifies the number of pixels averaged perpendicular to the search direction to compute the edge profile strength at each point along the region of interest.
Edge Strength Profile	A graphical representation of the edge contrast along the search line.

Advanced Tab

The following controls are available on the Advanced tab.

Control Name	Description
Edge Strength Profile	A graphical representation of the edge contrast along the search line. The yellow lines indicate the location of the edges.
Edge Points Found	Displays information about the edge points found on the specified Search Line/Edge Index. The following information is displayed for each edge: Strength—Strength of the edge. Values range from 0 to 1000 with larger values indicating a stronger edge. STR—Signal to threshold ratio for the edge, expressed in decibels. TNR—Threshold to noise ratio for the edge, expressed in decibels. SNR—Signal to noise ratio for the edge, expressed in decibels.

Limits Tab

The following controls are available on the Limits tab.

Control Name	Description
Minimum Number of Edges	Minimum number of edges you expect the step to find.
Maximum Number of Edges	Maximum number of edges you expect the step to find.
Number of Edges Found	Number of edges the step found.
Step Results	Displays information about the edges found in the image. Note  When you calibrate the image using a Calibrate Image step, X and Y are returned in the calibration unit you specified.