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FitCircleToEdges3D

Basic

Module: Vision3DStandard

Performs a series of 1D edge detections in 3D and finds a circle that best matches the detected points.

Applications

Precise detection of a circular object or hole, whose rough location is known beforehand.
Name Type Range Description
Input value
 inSurface Surface Surface to fit the circle to
Input value
 inFittingField CircleFittingField Circle fitting field
Input value
 inFittingFieldAlignment CoordinateSystem2D* Adjusts the fitting field to the position of the inspected object
Input value
 inScanCount Integer 3 - The number of points that will be searched to estimate the position of the circle
Input value
 inSamplingStep Real* 0.0 - Desired distance between consecutive sampling points on the scan segments; if Nil, the bigger of surface X and Y scales is chosen
Input value
 inScanWidth Integer 1 - The width of each scan field (in pixels)
Input value
 inSurfaceInterpolation InterpolationMethod Interpolation method used for extraction of surface points
Input value
 inEdgeScanParams EdgeScanParams3D Parameters controlling the edge extraction process
Input value
 inEdgeSelection Selection Selection mode of edges
Input value
 inLocalBlindness LocalBlindness* Defines conditions in which weaker edges can be detected in the vicinity of stronger edges
Input value
 inMaxProfileGapWidth Integer* 0 - Maximal number of consecutive not existing profile points
Input value
 inMaxIncompleteness Real 0.0 - 0.999 Maximal fraction of edge points not found
Input value
 inFittingMethod CircleFittingMethod Method used to fit a circle
Input value
 inOutlierSuppression MEstimator* Selects a method for ignoring incorrectly detected points
Output value
 outCircle Circle3D? Fitted circle or nothing if the fitting fails
Output value
 outEdges SurfaceEdge1D?Array Found edges
Output value
 outDeviationProfile Profile? Profile of distances between the actual circle points and the corresponding reference circle points
Output value
 outAlignedFittingField CircleFittingField Fitting field used; in the image coordinate system
Output value
 outInliers Point3DArray Points matching the fitting Circle
Output value
 outHeightProfiles ProfileArray Extracted surface height profiles
Output value
 outResponseProfiles ProfileArray Profiles of the edge (derivative) operator response
Diagnostic input
 diagScanSegments Segment2DArray Segments along which the scans were run
Diagnostic input
 diagSamplingAreas Rectangle2DArray Areas from which the input image is sampled

Hardware Acceleration

This operation supports automatic parallelization for multicore and multiprocessor systems.

Errors

This filter can throw an exception to report error. Read how to deal with errors in Error Handling.

List of possible exceptions:

Error type Description
DomainError Sampling step set to zero in FitCircleToEdges3D.

Complexity Level

This filter is available on Basic Complexity Level.

Filter Group

This filter is member of FitCircle3D filter group.