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AVL.FitPathToRidges_Direct

Performs a series of 1D ridge detections and creates a path from the detected points.

Namespace:AvlNet
Assembly:AVL.NET.dll

Syntax

C++
C#
 
public static void FitPathToRidges_Direct
(
	AvlNet.Image inImage,
	AvlNet.PathFittingField inFittingField,
	AvlNet.CoordinateSystem2D? inFittingFieldAlignment,
	float? inScanStep,
	int inScanWidth,
	AvlNet.SamplingParams inSamplingParams,
	AvlNet.RidgeScanParams inRidgeScanParams,
	AvlNet.Selection inRidgeSelection,
	AvlNet.LocalBlindness? inLocalBlindness,
	int? inMaxInterpolationLength,
	float? inMaxDeviationDelta,
	float inMaxIncompleteness,
	INullable<AvlNet.Path> outPath,
	IList<AvlNet.Ridge1D?> outRidges,
	INullable<AvlNet.Profile> outDeviationProfile,
	AvlNet.PathFittingField outAlignedFittingField,
	IList<AvlNet.Profile> outBrightnessProfiles,
	IList<AvlNet.Profile> outResponseProfiles,
	IList<AvlNet.Segment2D> diagScanSegments,
	IList<AvlNet.Rectangle2D> diagSamplingAreas
)

Parameters

Name Type Range Default Description
inImageAvlNet.ImageImage to fit the path to.
inFittingFieldAvlNet.PathFittingFieldPath fitting field.
inFittingFieldAlignmentAvlNet.CoordinateSystem2D?Adjusts the fitting field to the position of the inspected object. Default value: atl::NIL.
inScanStepfloat?<0.0f, INF>5.0fOptional implicit conversion of the input path to an equidistant one. Default value: 5.0f.
inScanWidthint<1, INF>5The width of each scan field (in pixels). Default value: 5.
inSamplingParamsAvlNet.SamplingParamsParameters controlling the sampling process.
inRidgeScanParamsAvlNet.RidgeScanParamsRidgeScanParams ( ProfileInterpolation: Quadratic4 SmoothingStdDev: 0.6f RidgeWidth: 5 RidgeMargin: 2 MinMagnitude: 5.0f RidgePolarity: Dark )Parameters controlling the ridge extraction process. Default value: RidgeScanParams ( ProfileInterpolation: Quadratic4 SmoothingStdDev: 0.6f RidgeWidth: 5 RidgeMargin: 2 MinMagnitude: 5.0f RidgePolarity: Dark ).
inRidgeSelectionAvlNet.SelectionSelection mode of ridges.
inLocalBlindnessAvlNet.LocalBlindness?Defines conditions in which weaker ridges can be detected in the vicinity of stronger ridges. Default value: atl::NIL.
inMaxInterpolationLengthint?<0, INF>1Maximal number of consecutive points not found. Default value: 1.
inMaxDeviationDeltafloat?<0.0f, INF>Maximal difference between deviations of consecutive path points. Default value: atl::NIL.
inMaxIncompletenessfloat<0.0f, 0.999f>0.1fMaximal fraction of ridge points not found. Default value: 0.1f.
outPathAvlNet.INullable<AvlNet.Path>Fitted path or nothing if the fitting failed. This parameter cannot be null.
outRidgesSystem.Collections.Generic.IList<AvlNet.Ridge1D?>Found ridges.
outDeviationProfileAvlNet.INullable<AvlNet.Profile>Profile of distances between the actual path points and the corresponding reference path points. This parameter cannot be null.
outAlignedFittingFieldAvlNet.PathFittingFieldFitting field used; in the image coordinate system.
outBrightnessProfilesSystem.Collections.Generic.IList<AvlNet.Profile>Extracted image profiles.
outResponseProfilesSystem.Collections.Generic.IList<AvlNet.Profile>Profiles of the ridge operator response.
diagScanSegmentsSystem.Collections.Generic.IList<AvlNet.Segment2D>Segments along which the scans were run.
diagSamplingAreasSystem.Collections.Generic.IList<AvlNet.Rectangle2D>Areas from which the input image is sampled.

Description

The operation tries to fit a given path to ridges present in the inImage image. Internally, it performs a series of scans with the ScanSingleRidge_Direct filter along a number of 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 path in the image. Only inMaxIncompleteness fraction of these scans may fail. If the fitting according to the given parameters is not possible, outPath is set to Nil.

There are also another parameters that control the path fitting process. The inMaxDeviationDelta parameter defines the maximal allowed difference between deviations of consecutive points from the input path points. If some of the scans fail or if some of found points are classified to be wrong according to another control parameters, output path points corresponding to them are interpolated depending on points in their nearest vicinity. No more than inMaxInterpolationLength consecutive points can be interpolated. The exception to this behavior are points which were not found on both ends of the input path. Those are not part of the result at all.

Examples

Fitting a path to the walls of a plastic capsule
(inRidgeScanParams.RidgePolarity = Dark, inRidgeScanParams.RidgeWidth = 6, inRidgeScanParams.RidgeOperator = ArithmeticMean).

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