Locate Edge

Localizes the points of the first occurring edge within a specified search window with subpixel accuracy.

Optionally, a Boolean signal can be selected for the Enable Execution input so that the algorithm is only active if the value of the selected signal is TRUE.

Configuration options

Start Point: Position from which the search process is started in the direction of the End Point.
End Point: Position at which the search process ends.
Edge Direction: Definition of the edge direction to be searched for.
Min Strength: Definition of the minimum strength or intensity difference of the edge being searched for.
Search Lines: Width of the search window, i.e. the number of search lines (1, 3, 5, 7, ...), centered around the line defined by Start Point and End Point.
Threshold: Threshold value for the binary image.
Search Line Dist: (Optional) Distance between the search lines in pixels (> 0).
Max Thickness: (Optional) Definition of the maximum thickness of the edge searched for. This means that Min Strength must be achieved within Max Thickness pixels.
Algorithm: (Optional) Choice of edge detection algorithm.
Subpixels Iterations: (Optional) Fixes the number of subpixels. For INTERPOLATION, 10 to 20 are usually sufficient. Alternatively, the value specifies the maximum number of iterations for optimizing the parameters; for APPROX_ERF and APPROX_GAUSSIAN, 50 to 100 is usually sufficient.
Approx Precision: (Optional) Fixes the approximation precision for APPROX_ERF and APPROX_GAUSSIAN. 0.001 is usually sufficient; the value is not used for INTERPOLATION.

Output values

Count Results: Is incremented when a new result is provided.
hr: HRESULT error code that outputs the result of the processing.
Image: Initial image of the algorithm.
New Result: (Optional) TRUE if a new result is provided.
Image Preview: (Optional) Image in which the edge found is drawn.
Image Threshold: (Optional) Image to which the set threshold is applied.
Edge Points: Container in which the points of the found edge are made available.