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SoElasticRegistrationProcessing2d Class

OIV.ImageViz.Engines.GeometryAndMatching.Registration.SoElasticRegistrationProcessing2d engine

Inheritance Hierarchy

Namespace: OIV.ImageViz.Engines.GeometryAndMatching.Registration
Assembly: OIV.ImageViz (in OIV.ImageViz.dll) Version: 10.8.3.0 (10.8.3.0)
Syntax
public class SoElasticRegistrationProcessing2d : SoImageVizEngine

The SoElasticRegistrationProcessing2d type exposes the following members.

Constructors
  NameDescription
Public methodSoElasticRegistrationProcessing2d

Constructor.

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Methods
  NameDescription
Public methodAbortEvaluate

Abort current processing as soon as possible.

(Inherited from SoImageVizEngine.)
Public methodCopy

Creates and returns an exact copy of the engine.

(Inherited from SoEngine.)
Public methodCopyFieldValues(SoFieldContainer)
Calls CopyFieldValues(fc, false).
(Inherited from SoFieldContainer.)
Public methodCopyFieldValues(SoFieldContainer, Boolean)

Copies the contents of fc's fields into this object's fields.

(Inherited from SoFieldContainer.)
Public methodDispose
Releases all resources used by SoDisposable.
(Inherited from SoDisposable.)
Public methodEnableNotify

Notification at this Field Container is enabled (if flag == true) or disabled (if flag == false).

(Inherited from SoFieldContainer.)
Public methodEquals
Determines whether the specified Object is equal to the current Object.
(Inherited from Object.)
Public methodFieldsAreEqual

Returns true if this object's fields are exactly equal to fc's fields.

(Inherited from SoFieldContainer.)
Public methodGet

Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.

(Inherited from SoFieldContainer.)
Public methodGetAllFields

Returns a list of fields, including the eventIn's and eventOut's.

(Inherited from SoFieldContainer.)
Public methodGetEventIn

Returns a the eventIn with the given name.

(Inherited from SoFieldContainer.)
Public methodGetEventOut

Returns the eventOut with the given name.

(Inherited from SoFieldContainer.)
Public methodGetField

Returns a the field of this object whose name is fieldName.

(Inherited from SoFieldContainer.)
Public methodGetFieldName

Returns the name of the given field in the fieldName argument.

(Inherited from SoFieldContainer.)
Public methodGetFields

Appends references to all of this object's fields to resultList, and returns the number of fields appended.

(Inherited from SoFieldContainer.)
Public methodGetHashCode
Overrides GetHashCode().
(Inherited from SoNetBase.)
Public methodGetName

Returns the name of an instance.

(Inherited from SoBase.)
Public methodGetOutput

Returns a reference to the engine output with the given name.

(Inherited from SoEngine.)
Public methodGetOutputName

Returns (in outputName) the name of the engine output (output).

(Inherited from SoEngine.)
Public methodGetOutputs

Returns a list of outputs in this engine.

(Inherited from SoEngine.)
Public methodGetStringName (Inherited from SoBase.)
Public methodGetType
Gets the Type of the current instance.
(Inherited from Object.)
Public methodHasDefaultValues

Returns true if all of the object's fields have their default values.

(Inherited from SoFieldContainer.)
Public methodIsEvaluating

Returns true if the engine evaluation is in progress.

(Inherited from SoImageVizEngine.)
Public methodIsNotifyEnabled

Notification is the process of telling interested objects that this object has changed.

(Inherited from SoFieldContainer.)
Public methodIsSynchronizable

Gets the ScaleViz synchronizable state of this object.

(Inherited from SoBase.)
Public methodSet

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.

(Inherited from SoFieldContainer.)
Public methodSetName (Inherited from SoBase.)
Public methodSetSynchronizable

Sets this to be a ScaleViz synchronizable object.

(Inherited from SoBase.)
Public methodSetToDefaults

Sets all fields in this object to their default values.

(Inherited from SoFieldContainer.)
Public methodStartEvaluate

Evaluate engine and dependencies in another thread without blocking the current one.

(Inherited from SoImageVizEngine.)
Public methodToString
Converts this SoBase structure to a human readable string.
(Inherited from SoBase.)
Public methodTouch

Marks an instance as modified, simulating a change to it.

(Inherited from SoBase.)
Public methodWaitEvaluate

Wait for the end of engine evaluation.

(Inherited from SoImageVizEngine.)
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Properties
  NameDescription
Public propertyelasticStandardDeviation

The standard deviation in pixel of the gaussian kernel used to smooth the displacement field at each iteration.

Public propertyfluidStandardDeviation

The standard deviation in pixel of the gaussian kernel used to smooth the forces field at each iteration.

Public propertyinFixedImage

The reference image on which the moving image has to be registered.

Public propertyinMovingImage

The input model image to be registered.

Public propertyIsDisposable
ISafeDisposable interface implementation.
(Inherited from SoDisposable.)
Public propertymetricType

Type of metric used to measure the similarity/dissimilarity between the fixed and the transformed image.

Public propertyoutDisplacementField

The displacement field that maps a pixel of the moving image onto the corresponding pixel in the fixed image.

Public propertyoutImage
Public propertypyramidLevels

A 2-dimensional vector: first coordinate is the coarsest resolution, second coordinate is the finest resolution.

Public propertytolerance

Maximum relative variation of the metric to stop the process.

Public propertyUserData
Gets or sets the user data to be contained by the field container.
(Inherited from SoFieldContainer.)
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Events
  NameDescription
Public eventOnBegin

Event raised when the processing begins.

(Inherited from SoImageVizEngine.)
Public eventOnEnd

Event raised when processing ends and the result is available.

(Inherited from SoImageVizEngine.)
Public eventOnProgress

Event raised while processing is running.

(Inherited from SoImageVizEngine.)
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Remarks

The 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