 | 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.
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| 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.
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| 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.
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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.
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Note When you calibrate the image using a Calibrate Image step, X and Y are returned in the calibration unit you specified. |
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