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AVL.FitCircleToEdges

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

Namespace:AvlNet
Assembly:AVL.NET.dll

Syntax

C++
C#
 
public static void FitCircleToEdges
(
	AvlNet.Image inImage,
	AvlNet.CircleFittingMap inFittingMap,
	AvlNet.EdgeScanParams inEdgeScanParams,
	AvlNet.Selection inEdgeSelection,
	float inMaxIncompleteness,
	AvlNet.CircleFittingMethod inFittingMethod,
	out AvlNet.Circle2D? outCircle
)

Parameters

Name Type Range Default Description
inImageAvlNet.ImageImage to fit the circle to.
inFittingMapAvlNet.CircleFittingMapInput fitting map.
inEdgeScanParamsAvlNet.EdgeScanParamsParameters controlling the edge extraction process.
inEdgeSelectionAvlNet.Selectionavl::SelectionBestSelection mode of edges. Default value: avl::SelectionBest.
inMaxIncompletenessfloat<0.0f, 0.999f>0.1fMaximal fraction of edge points not found. Default value: 0.1f.
inFittingMethodAvlNet.CircleFittingMethodAlgebraicTaubinMethod used to fit a circle. Default value: AlgebraicTaubin.
outCircleAvlNet.Circle2D?Fitted circle or nothing if the fitting fails.

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 filter using inFittingMap previously generated from the object being fitted. 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

See also