You are here: Start » FIL.NET » Function Reference » Computer Vision » Shape Fitting » FIL.FitCircleToStripe_Direct

FIL.FitCircleToStripe_Direct

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_Direct
(
	FilNet.Image inImage,
	FilNet.CircleFittingField inFittingField,
	int inScanCount,
	int inScanWidth,
	FilNet.SamplingParams inSamplingParams,
	FilNet.StripeScanParams inStripeScanParams,
	FilNet.Selection inStripeSelection,
	float inMaxIncompleteness,
	FilNet.CircleFittingMethod inFittingMethod,
	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.
inFittingFieldFilNet.CircleFittingFieldCircle fitting field.
inScanCountint<3, INF>10The number of points that will be searched to estimate the position of the circle. Default value: 10.
inScanWidthint<1, INF>5The width of each scan field (in pixels). Default value: 5.
inSamplingParamsFilNet.SamplingParamsParameters controlling the sampling process.
inStripeScanParamsFilNet.StripeScanParamsStripeScanParams ( ProfileInterpolation: Quadratic4 SmoothingStdDev: 0.6f MinMagnitude: 5.0f MaxInnerEdgeMagnitude: Nil StripePolarity: Dark MinStripeWidth: 0.0f MaxStripeWidth: Nil )Parameters controlling the stripe extraction process. Default value: StripeScanParams ( ProfileInterpolation: Quadratic4 SmoothingStdDev: 0.6f MinMagnitude: 5.0f MaxInnerEdgeMagnitude: Nil StripePolarity: Dark MinStripeWidth: 0.0f MaxStripeWidth: Nil ).
inStripeSelectionFilNet.SelectionSelection mode of stripe.
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.
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_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