Finds edge pairs along a specified path in the image.
This node performs an edge extraction and finds edge pairs based on specified criteria, such as the distance between the leading and trailing edges and edge polarity.
Reference to the source image.
Array containing the coordinates of the pixels to inspect.
You can obtain the pixel coordinates from an ROI descriptor using the ROI Profile node.
Cluster defining the characteristics of the filter used to detect the edges.
Threshold for the contrast of the edge.
Only edges with a contrast greater than this value are used in the detection process. contrast is defined as the difference between the average pixel intensity before the edge and the average pixel intensity after the edge.
Number of pixels that the node averages to find the contrast at either side of the edge.
Slope of the edge.
This value represents the number of pixels that correspond to the transition area of the edge.
Cluster containing information about subpixel analysis.
Number of samples to obtain from a pixel.
Method used to perform the interpolation.
Name | Value | Description |
---|---|---|
quadratic | 1 |
Uses the quadratic formula to compute the pixel location |
cubic spline | 2 |
Uses cubic splines to compute the pixel location |
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Default: No error
Inputs for finding edge pairs.
Polarity of the leading and trailing edge in the search process.
The following values are possible:
Name | Description |
---|---|
none | Polarity of the edges is ignored. |
dark-light | The leading edge has a dark-to-light polarity, and the trailing edge has a light-to-dark polarity. |
light-dark | The leading edge has a light-to-dark polarity, and the trailing edge has a dark-to-light polarity. |
dark-dark | The leading edge has a dark-to-light polarity, and the trailing edge has a dark-to-light polarity. |
light-light | The leading edge has a light-to-dark polarity, and the trailing edge has a light-to-dark polarity. |
Desired distance between the leading and trailing edges of an edge pair.
Edge pairs with separation distance outside the range [separation - separation dev., separation + separation dev.] are ignored. If you set this parameter to 0, the node finds all edge pairs.
Tolerance value for the separation between the edges.
This value influences the score of the detected edge pairs.
Reference to the source image.
Array of clusters that contain the following information about the detected edge pairs.
Location of the leading edge.
Contrast of the leading edge.
Location of the trailing edge.
Contrast of the trailing edge.
Computed distance in pixels between the edges in the edge pair.
Unused part of report.
Array of point clusters consisting of the spatial coordinates of the detected edges.
Number of detected edge pairs.
Error information.
The node produces this output according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported
Web Server: Not supported in VIs that run in a web application