| SoEigenvaluesToStructurenessProcessing3d Class |
OIV.ImageViz.Engines.EdgeDetection.EdgeMarking.SoEigenvaluesToStructurenessProcessing3d engine computes a structure score image.
Inheritance HierarchyOIV.InventorSoNetBase
OIV.InventorSoDisposable
OIV.Inventor.MiscSoBase
OIV.Inventor.FieldsSoFieldContainer
OIV.Inventor.EnginesSoEngine
OIV.ImageViz.EnginesSoImageVizEngine
OIV.ImageViz.Engines.EdgeDetection.EdgeMarkingSoEigenvaluesToStructurenessProcessing3d
Namespace: OIV.ImageViz.Engines.EdgeDetection.EdgeMarking
Assembly: OIV.ImageViz (in OIV.ImageViz.dll) Version: 2023.1.3.0 (2023.1.3)
SyntaxThe SoEigenvaluesToStructurenessProcessing3d type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | SoEigenvaluesToStructurenessProcessing3d | Constructor. |
Methods| Name | Description | |
|---|---|---|
| AbortEvaluate | Abort current processing as soon as possible. |
| Copy | Creates and returns an exact copy of the engine. |
| CopyFieldValues(SoFieldContainer) | Calls CopyFieldValues(fc, false). (Inherited from SoFieldContainer.) |
| CopyFieldValues(SoFieldContainer, Boolean) | Copies the contents of fc's fields into this object's fields. |
| Dispose |
Releases all resources used by SoDisposable.
(Inherited from SoDisposable.) |
| EnableNotify | Notification at this Field Container is enabled (if flag == true) or disabled (if flag == false). |
| Equals | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
| FieldsAreEqual | Returns true if this object's fields are exactly equal to fc's fields. |
| Get | Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string. |
| GetAllFields | Returns a list of fields, including the eventIn's and eventOut's. |
| GetEventIn | Returns a the eventIn with the given name. |
| GetEventOut | Returns the eventOut with the given name. |
| GetField | Returns a the field of this object whose name is fieldName. |
| GetFieldName | Returns the name of the given field in the fieldName argument. |
| GetFields | Appends references to all of this object's fields to resultList, and returns the number of fields appended. |
| GetHashCode |
Overrides GetHashCode().
(Inherited from SoNetBase.) |
| GetName | Returns the name of an instance. |
| GetOutput | Returns a reference to the engine output with the given name. |
| GetOutputName | Returns (in outputName) the name of the engine output (output). |
| GetOutputs | Returns a list of outputs in this engine. |
| GetStringName | (Inherited from SoBase.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| HasDefaultValues | Returns true if all of the object's fields have their default values. |
| IsEvaluating | Returns true if the engine evaluation is in progress. |
| IsNotifyEnabled | Notification is the process of telling interested objects that this object has changed. |
| IsSynchronizable | Gets the ScaleViz synchronizable state of this object. |
| Set | Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format. |
| SetName | (Inherited from SoBase.) |
| SetSynchronizable | Sets this to be a ScaleViz synchronizable object. |
| SetToDefaults | Sets all fields in this object to their default values. |
| StartEvaluate | Evaluate engine and dependencies in another thread without blocking the current one. |
| ToString |
Converts this SoBase structure to a human readable string.
(Inherited from SoBase.) |
| Touch | Marks an instance as modified, simulating a change to it. |
| WaitEvaluate | Wait for the end of engine evaluation. |
Properties| Name | Description | |
|---|---|---|
 | alpha | Flatness sensitivity threshold. |
| beta | Blobness sensitivity threshold. |
| inEigenvaluesImage | Image containing input eigenvalues field. |
| IsDisposable | ISafeDisposable interface implementation.
(Inherited from SoDisposable.) |
| lightness | The type of structure lightness to extract. |
| noiseCutoff | Noise scale factor. |
| outImage | Output image. |
| structureType | The type of structure lightness to extract. |
| UserData |
Gets or sets the user data to be contained by the field container.
(Inherited from SoFieldContainer.) |
Events| Name | Description | |
|---|---|---|
 | OnBegin | Event raised when the processing begins. |
| OnEnd | Event raised when processing ends and the result is available. |
| OnProgress | Event raised while processing is running. |
RemarksIt allows to extract tubular, blob-like and plate-like structures from dark or bright background.
The computation is based on eigen values 
, 
and 
where 
.
The structure score for bright tubular structures corresponds to :
and the score for bright blob-like structures is computed as follow :
and the score for bright plate-like structures is computed as follow :
where 
is the Hessian norm 
is a threshold which controls the flatness sensitivity, 
is a threshold which controls the blobness sensitivity, and c is a sensitivity threshold which controls the noise influence. 
with 
the maximum Hessian norm in the image.
For dark objects the conditions on , and are reversed.
The method is referenced by Frangi publication :
A.F.Frangi, W.J.Niessen, K.L.Vincken, M.A.Viergever, "Multiscale vessel enhancement filtering" Lecture Notes in Computer Science(MICCAI), vol. 1496, pp. 130-137, 1998.
This filter provides output float grayscale image where each voxel intensity represents a structure score.
FILE FORMAT/DEFAULT
EigenvaluesToStructurenessProcessing3d {
| inEigenvaluesImage | NULL |
| lightness | BRIGHT |
| structureType | ROD |
| alpha | 0.75f |
| beta | 0.75f |
| noiseCutoff | 0.5f |
Library references: EigenvaluesToStructureness3d
See Also