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FIL.FitCircleToStripe

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

Namespace:FilNet
Assembly:FIL.NET.dll

Syntax

C++
C#
 
public static void FitCircleToStripe
(
	FilNet.Image inImage,
	FilNet.CircleFittingMap inFittingMap,
	FilNet.StripeScanParams inStripeScanParams,
	FilNet.Selection inStripeSelection,
	FilNet.LocalBlindness? inLocalBlindness,
	float inMaxIncompleteness,
	FilNet.CircleFittingMethod inFittingMethod,
	FilNet.MEstimator? inOutlierSuppression,
	out FilNet.Circle2D? outCircle,
	out FilNet.Circle2D? outInnerCircle,
	out FilNet.Circle2D? outOuterCircle
)

Parameters

Name Type Range Default Description
inImageFilNet.ImageImage to fit the circle to.
inFittingMapFilNet.CircleFittingMapInput fitting map.
inStripeScanParamsFilNet.StripeScanParamsParameters controlling the stripe extraction process.
inStripeSelectionFilNet.Selectionfil::Selection::BestSelection mode of stripe. Default value: fil::Selection::Best.
inLocalBlindnessFilNet.LocalBlindness?Defines conditions in which weaker edges can be detected in the vicinity of stronger edges. Default value: ftl::NIL.
inMaxIncompletenessfloat<0.0f, 0.999f>0.1fMaximal fraction of stripe points not found. Default value: 0.1f.
inFittingMethodFilNet.CircleFittingMethodAlgebraicTaubinMethod used to fit a circle. Default value: AlgebraicTaubin.
inOutlierSuppressionFilNet.MEstimator?Selects a method for ignoring incorrectly detected points. Default value: ftl::NIL.
outCircleFilNet.Circle2D?Fitted circle in the middle of found stripe.
outInnerCircleFilNet.Circle2D?Fitted inner circle.
outOuterCircleFilNet.Circle2D?Fitted outer circle.

Description

The operation tries to fit a given circle to stripe present in the inImage image. Internally, it performs a series of scans with the ScanSingleStripe 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 circle to the dark circular stripe of a washer
(inStripeScanParams.Polarity = Dark).

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