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AVL.ScanMultipleRidges_Direct

Locates multiple dark or bright pixel peaks along a given path (without a scan map).

Namespace:AvlNet
Assembly:AVL.NET.dll

Syntax

C++
C#
 
public static void ScanMultipleRidges_Direct
(
	AvlNet.Image inImage,
	AvlNet.Path inScanPath,
	AvlNet.CoordinateSystem2D? inScanPathAlignment,
	int inScanWidth,
	AvlNet.SamplingParams inSamplingParams,
	AvlNet.RidgeScanParams inRidgeScanParams,
	float inMinDistance,
	float? inMaxDistance,
	AvlNet.LocalBlindness? inLocalBlindness,
	IList<AvlNet.Ridge1D> outRidges,
	IList<AvlNet.Gap1D> outGaps,
	NullableRef<AvlNet.Path> outAlignedScanPath,
	NullableRef<AvlNet.Profile> outBrightnessProfile,
	NullableRef<AvlNet.Profile> outResponseProfile
)

Parameters

Name Type Range Default Description
inImageAvlNet.ImageInput image.
inScanPathAvlNet.PathPath along which the scan is performed.
inScanPathAlignmentAvlNet.CoordinateSystem2D?Adjusts the scan path to the position of the inspected object. Default value: atl::NIL.
inScanWidthint<1, INF>5Width of the scan field in pixels. Default value: 5.
inSamplingParamsAvlNet.SamplingParamsSamplingParams ( Interpolation: Bilinear SamplingStep: 1.0f SampleCount: Nil )Parameters controlling the sampling process. Default value: SamplingParams ( Interpolation: Bilinear SamplingStep: 1.0f SampleCount: Nil ).
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 ).
inMinDistancefloat<0.0f, INF>0.0fMinimal distance between consecutive ridges. Default value: 0.0f.
inMaxDistancefloat?<0.0f, INF>Maximal distance between consecutive ridges. Default value: atl::NIL.
inLocalBlindnessAvlNet.LocalBlindness?Defines conditions in which weaker ridges can be detected in the vicinity of stronger ridges. Default value: atl::NIL.
outRidgesSystem.Collections.Generic.IList<AvlNet.Ridge1D>Found ridges.
outGapsSystem.Collections.Generic.IList<AvlNet.Gap1D>Gaps between consecutive ridges.
outAlignedScanPathAvlNet.NullableRef<AvlNet.Path>Transformed input path. Can be null to skip this parameter calculation.
outBrightnessProfileAvlNet.NullableRef<AvlNet.Profile>Extracted image profile. Can be null to skip this parameter calculation.
outResponseProfileAvlNet.NullableRef<AvlNet.Profile>Profile of the ridge operator response. Can be null to skip this parameter calculation.

Description

The operation scans the image along inScanPath and detects ridges. Depending on the inRidgeScanParams.ridgePolarity parameter, dark, bright or both ridges will be taken into account.

When the number of ridges to be measured is known, one can use the ScanExactlyNRidges filter.

The optional parameter inScanPathAlignment defines a transform to be performed on the inScanPath so that the actual scan path (outAlignedScanPath) is adjusted to the position of the object, typically detected by one of Template Matching filters.

Note that in case of a scan path which is closed, the parameters controlling the distances between consecutive found objects do not control the distance between the first and the last of the found objects (counting from the beginning of the scan path).

Examples

ScanMultipleRidges locates the ridges across inScanPath.

Remarks

Read more about Local Coordinate Systems in Machine Vision Guide: Local Coordinate Systems.

This filter is a part of the 1D Edge Detection toolset. For a comprehensive introduction to this technique please refer to 1D Edge Detection and 1D Edge Detection - Subpixel Precision chapters of our Machine Vision Guide.

Function Overrides

See also