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FIL.FitCircleToEdges_Direct
Performs a series of 1D edge detections and finds a circle that best matches the detected points.
| Namespace: | FilNet |
|---|---|
| Assembly: | FIL.NET.dll |
Syntax
public static void FitCircleToEdges_Direct ( FilNet.Image inImage, FilNet.CircleFittingField inFittingField, FilNet.CoordinateSystem2D? inFittingFieldAlignment, int inScanCount, int inScanWidth, FilNet.SamplingParams inSamplingParams, FilNet.EdgeScanParams inEdgeScanParams, FilNet.Selection inEdgeSelection, FilNet.LocalBlindness? inLocalBlindness, float inMaxIncompleteness, FilNet.CircleFittingMethod inFittingMethod, FilNet.MEstimator? inOutlierSuppression, out FilNet.Circle2D? outCircle, IList<FilNet.Edge1D?> outEdges, INullable<FilNet.Profile> outDeviationProfile, out FilNet.CircleFittingField outAlignedFittingField, IList<FilNet.Point2D> outInliers, IList<FilNet.Profile> outBrightnessProfiles, IList<FilNet.Profile> outResponseProfiles, IList<FilNet.Segment2D> diagScanSegments, IList<FilNet.Rectangle2D> diagSamplingAreas )
Parameters
| Name | Type | Range | Default | Description | |
|---|---|---|---|---|---|
 | inImage | FilNet.Image | Image to fit the circle to. | ||
| inFittingField | FilNet.CircleFittingField | Circle fitting field. | ||
| inFittingFieldAlignment | FilNet.CoordinateSystem2D? | Adjusts the fitting field to the position of the inspected object. Default value: ftl::NIL. | ||
| inScanCount | int | <3, INF> | 10 | The number of points that will be searched to estimate the position of the circle. Default value: 10. |
| inScanWidth | int | <1, INF> | 5 | The width of each scan field (in pixels). Default value: 5. |
| inSamplingParams | FilNet.SamplingParams | Parameters controlling the sampling process. | ||
| inEdgeScanParams | FilNet.EdgeScanParams | EdgeScanParams ( ProfileInterpolation: Quadratic4 SmoothingStdDev: 1.0f MinMagnitude: 5.0f EdgeTransition: BrightToDark ) | Parameters controlling the edge extraction process. Default value: EdgeScanParams ( ProfileInterpolation: Quadratic4 SmoothingStdDev: 1.0f MinMagnitude: 5.0f EdgeTransition: BrightToDark ). | |
| inEdgeSelection | FilNet.Selection | Selection mode of edges. | ||
| inLocalBlindness | FilNet.LocalBlindness? | Defines conditions in which weaker edges can be detected in the vicinity of stronger edges. Default value: ftl::NIL. | ||
| inMaxIncompleteness | float | <0.0f, 0.999f> | 0.1f | Maximal fraction of edge points not found. Default value: 0.1f. |
| inFittingMethod | FilNet.CircleFittingMethod | AlgebraicTaubin | Method used to fit a circle. Default value: AlgebraicTaubin. | |
| inOutlierSuppression | FilNet.MEstimator? | Selects a method for ignoring incorrectly detected points. Default value: ftl::NIL. | ||
 | outCircle | FilNet.Circle2D? | Fitted circle or nothing if the fitting fails. | ||
| outEdges | System.Collections.Generic.IList<FilNet.Edge1D?> | Found edges. | ||
| outDeviationProfile | FilNet.INullable<FilNet.Profile> | Profile of distances between the actual circle points and the corresponding reference circle points. This parameter cannot be null. | ||
| outAlignedFittingField | FilNet.CircleFittingField | Fitting field used; in the image coordinate system. | ||
| outInliers | System.Collections.Generic.IList<FilNet.Point2D> | Points matching the fitting Circle. | ||
| outBrightnessProfiles | System.Collections.Generic.IList<FilNet.Profile> | Extracted image profiles. | ||
| outResponseProfiles | System.Collections.Generic.IList<FilNet.Profile> | Profiles of the edge (derivative) operator response. | ||
 | diagScanSegments | System.Collections.Generic.IList<FilNet.Segment2D> | Segments along which the scans were run. | ||
| diagSamplingAreas | System.Collections.Generic.IList<FilNet.Rectangle2D> | Areas from which the input image is sampled. |
Description
The operation tries to fit a given circle to edges present in the inImage image. Internally, it performs a series of scans with the ScanSingleEdge_Direct filter along inScanCount specific scan segments which length is always equal to the inFittingField width and cannot be less than 4. The found points are then used to determine the actual position of the circle in the image. Only inMaxIncompleteness fraction of these scans may fail. If the fitting according to the given parameters is not possible, outCircle is set to Nil.
Examples
Fitting a circles to the edges of a hole
(inEdgeScanParams.Transition = BrightToDark).
Remarks
Read more about Local Coordinate Systems in Machine Vision Guide: Local Coordinate Systems.
This filter is a part of the Shape Fitting toolset. To read more about this technique, one can refer to the Shape Fitting chapter of our Machine Vision Guide
Hardware Acceleration
This operation supports automatic parallelization for multicore and multiprocessor systems.
Hardware acceleration settings may be manipulated with Settings class.
Function Overrides
- FitCircleToEdges_Direct(Image, CircleFittingField, Int32, Int32, SamplingParams, EdgeScanParams, Selection, Single, CircleFittingMethod, Nullable<Circle2D>)
- FitCircleToEdges_Direct(Image, CircleFittingField, Nullable<CoordinateSystem2D>, Int32, Int32, SamplingParams, EdgeScanParams, Selection, Nullable<LocalBlindness>, Single, CircleFittingMethod, Nullable<MEstimator>, Nullable<Circle2D>)
- FitCircleToEdges_Direct(Image, CircleFittingField, Nullable<CoordinateSystem2D>, Int32, Int32, SamplingParams, EdgeScanParams, Selection, Nullable<LocalBlindness>, Single, CircleFittingMethod, Nullable<MEstimator>, Nullable<Circle2D>, NullableRef<List<Nullable<Edge1D>>>, NullableRef<NullableRef<Profile>>, NullableValue<CircleFittingField>, NullableRef<List<Point2D>>, NullableRef<SafeList<Profile>>, NullableRef<SafeList<Profile>>)
- FitCircleToEdges_Direct(Image, CircleFittingField, Nullable<CoordinateSystem2D>, Int32, Int32, SamplingParams, EdgeScanParams, Selection, Nullable<LocalBlindness>, Single, CircleFittingMethod, Nullable<MEstimator>, Nullable<Circle2D>, NullableRef<List<Nullable<Edge1D>>>, NullableRef<NullableRef<Profile>>, NullableValue<CircleFittingField>, NullableRef<List<Point2D>>, NullableRef<SafeList<Profile>>, NullableRef<SafeList<Profile>>, IList<Segment2D>, IList<Rectangle2D>)
