| SoEigenvaluesToStructurenessProcessing2d Class |
OIV.ImageViz.Engines.EdgeDetection.EdgeMarking.SoEigenvaluesToStructurenessProcessing2d 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.EdgeMarkingSoEigenvaluesToStructurenessProcessing2d
Namespace: OIV.ImageViz.Engines.EdgeDetection.EdgeMarking
Assembly: OIV.ImageViz (in OIV.ImageViz.dll) Version: 2023.1.3.0 (2023.1.3)
SyntaxThe SoEigenvaluesToStructurenessProcessing2d type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | SoEigenvaluesToStructurenessProcessing2d | 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 | |
|---|---|---|
 | 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 | Shape of structures 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 or blob-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 :
where 
is the Hessian norm 
, 
is a threshold which controls the blobness sensitivity,
and c is a sensitivity threshold wich 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 engine provides output float grayscale image where each voxel intensity represents a structure score.
FILE FORMAT/DEFAULT
EigenvaluesToStructurenessProcessing2d {
| inEigenvaluesImage | NULL |
| lightness | BRIGHT |
| structureType | ROD |
| beta | 0.75f |
| noiseCutoff | 0.5f |
Library references: EigenvaluesToStructureness2d
See Also