| SoCooccurrenceQuantification2d Class |
OIV.ImageViz.Engines.ImageAnalysis.Statistics.SoCooccurrenceQuantification2d engine provides texture indicators based on the co-occurrence matrix computation.
Inheritance HierarchyOIV.InventorSoNetBase
OIV.InventorSoDisposable
OIV.Inventor.MiscSoBase
OIV.Inventor.FieldsSoFieldContainer
OIV.Inventor.EnginesSoEngine
OIV.ImageViz.EnginesSoImageVizEngine
OIV.ImageViz.Engines.ImageAnalysis.StatisticsSoCooccurrenceQuantification2d
Namespace: OIV.ImageViz.Engines.ImageAnalysis.Statistics
Assembly: OIV.ImageViz (in OIV.ImageViz.dll) Version: 2023.1.3.0 (2023.1.3)
SyntaxThe SoCooccurrenceQuantification2d type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | SoCooccurrenceQuantification2d | 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 | |
|---|---|---|
 | inImage | The input image. |
| inMaskImage | The binary image for the mask or empty (command looks for only inside). |
| IsDisposable | ISafeDisposable interface implementation.
(Inherited from SoDisposable.) |
| offsetX | The X Offset. |
| offsetY | The Y Offset. |
| outResult | The output measure result. |
| 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.ImageAnalysis.Statistics.SoCooccurrenceQuantification2d engine provides some information concerning the texture thanks to the computation of a co-occurrence matrix. This command allow s to classify, given a direction 
, pairs of pixels by their gray level. The co-occurrence matrix components are given by : 
Where 
is the image graylevel for 
coordinates.
This formulation means that for a given pair 
, 
contains the number of pixels verifying 
and 
.
This matrix is made symmetric and normalized such as :
These operations allow to be independent to the image size and to hold properties on a direction and its symmetric. Thirteen indicators are computed from this matrix :
an angular second moment indicator (ASM), also called uniformity. This indicator takes high values when image pixels present strong local uniformity.
a contrast indicator (Con). This indicator takes high values for great gray level variations.
a correlation indicator (Cor) which measures the dependency between gray levels and those of neighbouring pixels.
where : 
a variance indicator (SSV) also called sum of squares. This indicator measures the dispersion of the combination of gray levels and their neighbour pixels around the mean.
an inverse difference moment (IDM) also called homogeneity.
a sum average indicator (SAv).
a sum variance indicator (SVa).
a sum entropy indicator (SEn).
an entropy indicator (Ent).
a difference variance indicator (DVa).
a difference entropy indicator (DEn).
two information measures of correlation (IC1 and IC2).
where HX and HY are entropies of px and py such as : 
and 
In addition this engine returns one more information in the result object which is the number of image pixels used for computation.
References
Haralick R., Shanmugam K. & Dinstein I. "Textural features for image classification." IEEE Transactions on Systems, Man, and Cybernetics. Vol 3, No 6, pp 610-621, October 1973.
FILE FORMAT/DEFAULT
CooccurrenceQuantification2d {
| inImage | NULL |
| inMaskImage | NULL |
| offsetX | 1 |
| offsetY | 0 |
Library references: cooccurrence
See Also