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AVL.FitCircleToStripe_Direct

Namespace:AvlNet
Assembly:AVL.NET.dll

Syntax

C++
C#
 
public static void FitCircleToStripe_Direct
(
	AvlNet.Image inImage,
	AvlNet.CircleFittingField inFittingField,
	AvlNet.CoordinateSystem2D? inFittingFieldAlignment,
	int inScanCount,
	int inScanWidth,
	AvlNet.SamplingParams inSamplingParams,
	AvlNet.StripeScanParams inStripeScanParams,
	AvlNet.Selection inStripeSelection,
	AvlNet.LocalBlindness? inLocalBlindness,
	float inMaxIncompleteness,
	AvlNet.CircleFittingMethod inFittingMethod,
	AvlNet.MEstimator? inOutlierSuppression,
	out AvlNet.Circle2D? outCircle,
	out AvlNet.Circle2D? outInnerCircle,
	out AvlNet.Circle2D? outOuterCircle,
	NullableRef<List<NullableRef<AvlNet.Stripe1D>>> outStripes,
	NullableRef<List<AvlNet.Point2D>> outStripePoints,
	NullableRef<NullableRef<AvlNet.Profile>> outDeviationProfile,
	NullableValue<AvlNet.CircleFittingField> outAlignedFittingField,
	NullableRef<SafeList<AvlNet.Profile>> outBrightnessProfiles,
	NullableRef<SafeList<AvlNet.Profile>> outResponseProfiles
)

Parameters

Name Type Range Default Description
inImageAvlNet.ImageImage to fit the circle to
inFittingFieldAvlNet.CircleFittingFieldCircle fitting field
inFittingFieldAlignmentAvlNet.CoordinateSystem2D?Adjusts the fitting field to the position of the inspected object
inScanCountint<3, INF>10The number of points that will be searched to estimate the position of the circle
inScanWidthint<1, INF>5The width of each scan field (in pixels)
inSamplingParamsAvlNet.SamplingParamsParameters controlling the sampling process
inStripeScanParamsAvlNet.StripeScanParamsStripeScanParams ( ProfileInterpolation: Quadratic4 SmoothingStdDev: 0.6f MinMagnitude: 5.0f MaxInnerEdgeMagnitude: Nil StripePolarity: Dark MinStripeWidth: 0.0f MaxStripeWidth: Nil )Parameters controlling the stripe extraction process
inStripeSelectionAvlNet.SelectionSelection mode of stripe
inLocalBlindnessAvlNet.LocalBlindness?Defines conditions in which weaker edges can be detected in the vicinity of stronger edges
inMaxIncompletenessfloat<0.0f, 0.999f>0.1fMaximal fraction of stripe points not found
inFittingMethodAvlNet.CircleFittingMethodAlgebraicTaubinMethod used to fit a circle
inOutlierSuppressionAvlNet.MEstimator?Selects a method for ignoring incorrectly detected points
outCircleAvlNet.Circle2D?Fitted circle in the middle of found stripe
outInnerCircleAvlNet.Circle2D?Fitted inner circle
outOuterCircleAvlNet.Circle2D?Fitted outer circle
outStripesAvlNet.NullableRef<System.Collections.Generic.List<AvlNet.NullableRef<AvlNet.Stripe1D>>>Found stripes
outStripePointsAvlNet.NullableRef<System.Collections.Generic.List<AvlNet.Point2D>>Extracted points of middle circle of an image stripe
outDeviationProfileAvlNet.NullableRef<AvlNet.NullableRef<AvlNet.Profile>>Profile of distances between the actual circle points and the corresponding reference circle points
outAlignedFittingFieldAvlNet.NullableValue<AvlNet.CircleFittingField>Fitting field used; in the image coordinate system
outBrightnessProfilesAvlNet.NullableRef<AvlNet.SafeList<AvlNet.Profile>>Extracted image profiles
outResponseProfilesAvlNet.NullableRef<AvlNet.SafeList<AvlNet.Profile>>Profiles of the edge (derivative) operator response

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_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 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