You are here: Start » AVL.NET » AVL.ScanMultipleEdges(AvlNet.Image, AvlNet.ScanMap, AvlNet.EdgeScanParams, float, float?, AvlNet.LocalBlindness, AvlNet.Edge1D[], AvlNet.Gap1D[], AvlNet.Profile, AvlNet.Profile)

AVL.ScanMultipleEdges(AvlNet.Image, AvlNet.ScanMap, AvlNet.EdgeScanParams, float, float?, AvlNet.LocalBlindness, AvlNet.Edge1D[], AvlNet.Gap1D[], AvlNet.Profile, AvlNet.Profile)

Locates multiple transitions between dark and bright pixels along a given path.

Namespace:	AvlNet
Assembly:	AVL.NET.dll

Syntax


public static void ScanMultipleEdges(
	AvlNet.Image inImage,
	AvlNet.ScanMap inScanMap,
	AvlNet.EdgeScanParams inEdgeScanParams,
	float inMinDistance,
	float? inMaxDistance,
	AvlNet.LocalBlindness inLocalBlindness,
	out AvlNet.Edge1D[] outEdges,
	out AvlNet.Gap1D[] outGaps,
	out AvlNet.Profile diagBrightnessProfile,
	out AvlNet.Profile diagResponseProfile
)

Parameters

inImage: Type: AvlNet.Image
Input image
inScanMap: Type: AvlNet.ScanMap
Data precomputed with CreateScanMap
inEdgeScanParams: Type: AvlNet.EdgeScanParams
Parameters controlling the edge extraction process
inMinDistance: Type: System.Single
Minimal distance between consecutive edges
inMaxDistance: Type: System.Nullable<System.Single>
Maximal distance between consecutive edges, or null.
inLocalBlindness: Type: AvlNet.LocalBlindness
Defines conditions in which weaker edges can be detected in the vicinity of stronger edges, or null.
outEdges: Type: AvlNet.Edge1D
Found edges
outGaps: Type: AvlNet.Gap1D
Gaps between consecutive edges
diagBrightnessProfile: Type: AvlNet.Profile
Extracted image profile
diagResponseProfile: Type: AvlNet.Profile
Profile of the edge (derivative) operator response

Description

The operation scans the image using inScanMap previously generated from a scan path and detects image edges perpendicular to the path. Depending on the inEdgeScanParams.edgeTransition parameter, edges representing increase or decrease (or both) of image brightness along the path will be taken into account.

When the number of edges to be found is known, one can use the ScanExactlyNEdges.

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

ScanExactlyNEdges locates the edges using a scan map representing the scan path above.

Remarks

For more information about local coordinate systems please refer to the following article.