| SoElasticRegistrationProcessing2d Class |
OIV.ImageViz.Engines.GeometryAndMatching.Registration.SoElasticRegistrationProcessing2d engine
Inheritance HierarchyOIV.InventorSoNetBase
OIV.InventorSoDisposable
OIV.Inventor.MiscSoBase
OIV.Inventor.FieldsSoFieldContainer
OIV.Inventor.EnginesSoEngine
OIV.ImageViz.EnginesSoImageVizEngine
OIV.ImageViz.Engines.GeometryAndMatching.RegistrationSoElasticRegistrationProcessing2d
Namespace: OIV.ImageViz.Engines.GeometryAndMatching.Registration
Assembly: OIV.ImageViz (in OIV.ImageViz.dll) Version: 2023.1.3.0 (2023.1.3)
SyntaxThe SoElasticRegistrationProcessing2d type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | SoElasticRegistrationProcessing2d | 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 | |
|---|---|---|
 | elasticStandardDeviation | The standard deviation in pixel of the gaussian kernel used to smooth the displacement field at each iteration. |
| fluidStandardDeviation | The standard deviation in pixel of the gaussian kernel used to smooth the forces field at each iteration. |
| inFixedImage | The reference image on which the moving image has to be registered. |
| inMovingImage | The input model image to be registered. |
| IsDisposable | ISafeDisposable interface implementation.
(Inherited from SoDisposable.) |
| metricType | Type of metric used to measure the similarity/dissimilarity between the fixed and the transformed image. |
| outDisplacementField | The displacement field that maps a pixel of the moving image onto the corresponding pixel in the fixed image. |
| outImage | The OIV.ImageViz.Engines.GeometryAndMatching.Registration.SoElasticRegistrationProcessing2d.inMovingImage transformed by the output displacement field. |
| pyramidLevels | A 2-dimensional vector: first coordinate is the coarsest resolution, second coordinate is the finest resolution. |
| tolerance | Maximum relative variation of the metric to stop the process. |
| 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. |
RemarksThe OIV.ImageViz.Engines.GeometryAndMatching.Registration.SoElasticRegistrationProcessing2d engine computes the optimal elastic transformation to register a moving image on a fixed image.
Registration is a mapping technique between two images in order to compare it. The different registration algorithms depend on the type of transformation that will be applied on the moving image.
OIV.ImageViz.Engines.GeometryAndMatching.Registration.SoElasticRegistrationProcessing2d class computes the optimal elastic transformation to register a moving image on a fixed image.
The main output of the algorithm is a displacement image representing the computed transformation. Each pixel of this image contains two values: a displacement to apply in x direction and an other to apply in y direction on the corresponding pixel of the moving image to be registered on the fixed image.
The OIV.ImageViz.Engines.GeometryAndMatching.Registration.SoElasticRegistrationProcessing2d implementation relies on the non-rigid registration demon algorithm, it is detailed in the publication:
Jean-Philippe Thirion. Image matching as a diffusion process: an analogy with Maxwell’s demons. Medical Image Analysis, Elsevier, 1998, 2 (3), pp.243–260
OIV.ImageViz.Engines.GeometryAndMatching.Registration.SoElasticRegistrationProcessing2d has two levels of regularization: fluid and elastic. The fluid regularization corresponds to the forces field regularization and the elastic one corresponds to the displacement field regularization.
The forces field is an elementary displacement which is iteratively added to the current displacement field during the registration procedure. This forces field tends to decrease the similarity measure between the 2 images.
The coarsest and the finest resolution levels of the multi-resolution can be user-defined. The registration is evaluated at the coarsest level first and then iteratively at each level until the finest one. The higher finest level, the faster the computation is. The lower finest level, the more accurate the registration is.
The multi-resolution approach prevents the optimization procedure from falling into a local extrema and also speeds up the calculation.
OIV.ImageViz.Engines.GeometryAndMatching.Registration.SoElasticRegistrationProcessing2d also proposes a multi-resolution approach.
 |  |  |
(a) Original image. (b) Artificially distorted image. (c) Registered image.
FILE FORMAT/DEFAULT
ElasticRegistrationProcessing2d {
| metricType | EUCLIDEAN |
| inFixedImage | NULL |
| inMovingImage | NULL |
| tolerance | 0.025 |
| pyramidLevels | 2 0 |
| elasticStandardDeviation | 10.0f 10.0f |
| fluidStandardDeviation | 10.0f 10.0f |
Library references: ElasticRegistration2d
See Also