SoCooccurrenceQuantification2d engine provides texture indicators based on the co-occurrence matrix computation. More...

#include <ImageViz/Engines/ImageAnalysis/Statistics/SoCooccurrenceQuantification2d.h>

Inheritance diagram for SoCooccurrenceQuantification2d:

Classes
class	SbCoocurrrenceDetail
	Results details of cooccurrence global measure. More...

Public Member Functions
	SoCooccurrenceQuantification2d ()
	Constructor.

Public Member Functions inherited from SoImageVizEngine
virtual SoType	getTypeId () const
	Returns the type identifier for this specific instance.

virtual void	startEvaluate ()
	Evaluate engine and dependencies in another thread without blocking the current one.

virtual void	waitEvaluate ()
	Wait for the end of engine evaluation.

virtual void	abortEvaluate ()
	Abort current processing as soon as possible.

virtual bool	isEvaluating ()
	Returns true if the engine evaluation is in progress.

Public Member Functions inherited from SoEngine
virtual int	getOutputs (SoEngineOutputList &list) const
	Returns a list of outputs in this engine.

SoEngineOutput *	getOutput (const SbName &outputName) const
	Returns a reference to the engine output with the given name.

SbBool	getOutputName (const SoEngineOutput *output, SbName &outputName) const
	Returns (in outputName) the name of the engine output (output).

SoEngine *	copy () const
	Creates and returns an exact copy of the engine.

Public Member Functions inherited from SoFieldContainer
void	setToDefaults ()
	Sets all fields in this object to their default values.

SbBool	hasDefaultValues () const
	Returns TRUE if all of the object's fields have their default values.

SbBool	fieldsAreEqual (const SoFieldContainer *fc) const
	Returns TRUE if this object's fields are exactly equal to fc's fields.

void	copyFieldValues (const SoFieldContainer *fc, SbBool copyConnections=FALSE)
	Copies the contents of fc's fields into this object's fields.

SoNONUNICODE SbBool	set (const char *fieldDataString)
	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.

SbBool	set (const SbString &fieldDataString)
	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.

void	get (SbString &fieldDataString)
	Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.

virtual int	getFields (SoFieldList &list) const
	Appends references to all of this object's fields to resultList, and returns the number of fields appended.

virtual int	getAllFields (SoFieldList &list) const
	Returns a list of fields, including the eventIn's and eventOut's.

virtual SoField *	getField (const SbName &fieldName) const
	Returns a the field of this object whose name is fieldName.

virtual SoField *	getEventIn (const SbName &fieldName) const
	Returns a the eventIn with the given name.

virtual SoField *	getEventOut (const SbName &fieldName) const
	Returns the eventOut with the given name.

SbBool	getFieldName (const SoField *field, SbName &fieldName) const
	Returns the name of the given field in the fieldName argument.

SbBool	enableNotify (SbBool flag)
	Notification at this Field Container is enabled (if flag == TRUE) or disabled (if flag == FALSE).

SbBool	isNotifyEnabled () const
	Notification is the process of telling interested objects that this object has changed.

virtual void	setUserData (void *data)
	Sets application data.

void *	getUserData (void) const
	Gets user application data.

Public Member Functions inherited from SoBase
virtual void	touch ()
	Marks an instance as modified, simulating a change to it.

virtual SbName	getName () const
	Returns the name of an instance.

virtual void	setName (const SbName &name)
	Sets the name of an instance.

void	setSynchronizable (const bool b)
	Sets this to be a ScaleViz synchronizable object.

bool	isSynchronizable () const
	Gets the ScaleViz synchronizable state of this object.

Public Member Functions inherited from SoRefCounter
void	ref () const
	Adds a reference to an instance.

void	unref () const
	Removes a reference from an instance.

void	unrefNoDelete () const
	unrefNoDelete() should be called when it is desired to decrement the reference count, but not delete the instance if this brings the reference count to zero.

int	getRefCount () const
	Returns current reference count.

void	lock () const
	lock this instance.

void	unlock () const
	unlock this instance.

Public Member Functions inherited from SoTypedObject
SbBool	isOfType (const SoType &type) const
	Returns TRUE if this object is of the type specified in type or is derived from that type.

template<typename TypedObjectClass >
SbBool	isOfType () const
	Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.

Public Attributes
SoSFImageDataAdapter	inImage
	The input image.

SoSFImageDataAdapter	inMaskImage
	The binary image for the mask or empty (command looks for only inside).

SoSFInt32	offsetX
	The X Offset.

SoSFInt32	offsetY
	The Y Offset.

SoImageVizEngineAnalysisOutput< SbCoocurrrenceDetail >	outResult
	The output measure result.

Public Attributes inherited from SoImageVizEngine
SbEventHandler< EventArg & >	onBegin
	Event raised when the processing begins.

SbEventHandler< EventArg & >	onEnd
	Event raised when processing ends and the result is available.

SbEventHandler< EventArg & >	onProgress
	Event raised while processing is running.

Additional Inherited Members
Public Types inherited from SoImageVizEngine
enum	ComputeMode { MODE_2D = 0 , MODE_3D = 1 , MODE_AUTO = 2 }
	Compute Mode This enum specifies whether the main input will be interpreted as a 3D volume or a stack of 2D images for processing. More...

enum	Neighborhood3d { CONNECTIVITY_6 = 0 , CONNECTIVITY_18 = 1 , CONNECTIVITY_26 = 2 }
	Neighborhood Connectivity 3D. More...

Static Public Member Functions inherited from SoImageVizEngine
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Static Public Member Functions inherited from SoEngine
static SoType	getClassTypeId ()
	Returns the type identifier for the SoEngine class.

static SoEngine *	getByName (const SbName &name)
	Looks up engine(s) by name.

static int	getByName (const SbName &name, SoEngineList &list)
	Looks up engine(s) by name.

Static Public Member Functions inherited from SoFieldContainer
static SoType	getClassTypeId ()
	Returns the type of this class.

Static Public Member Functions inherited from SoBase
static SoType	getClassTypeId ()
	Returns type identifier for this class.

Static Public Member Functions inherited from SoTypedObject
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Detailed Description

SoCooccurrenceQuantification2d engine provides texture indicators based on the co-occurrence matrix computation.

The 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 $(dx,dy)$ , pairs of pixels by their gray level. The co-occurrence matrix components are given by :

$M(i,j)=number\left(\{x,y\}/(I(x,y)=i)\cap(I(x+dx,y+dy)=j)\right)$

Where $I(x,y)$ is the image graylevel for $(x,y)$ coordinates.
This formulation means that for a given pair $(i,j)$ , $M(i,j)$ contains the number of pixels verifying $I(x,y)=i$ and $I(x+dx,y+dy)=j$ .

This matrix is made symmetric and normalized such as :

$\forall(i,j),M(i,j)=M(j,i) ~\mbox{and} \sum_{i,j=1}^{N}M(i,j)=1$

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.
$ASM= \sum_{i,j=1}^{N}{M(i,j)}^2$
a contrast indicator (Con). This indicator takes high values for great gray level variations.
$Con= \sum_{i,j=1}^{N}M(i,j)\times(i-j)^2$
a correlation indicator (Cor) which measures the dependency between gray levels and those of neighbouring pixels.
$Cor= \sum_{i,j=1}^{N}M(i,j)\times\frac{(i-\mu_i)(i-\mu_j)}{\sqrt{\sigma_i^2\sigma_j^2}}$
where :
$\mu_i=\mu_j=\sum_{i,j=1}^{N}i\times M(i,j) ~\mbox{and}~ \sigma_i^2=\sigma_j^2=\sum_{i,j=1}^{N}M(i,j)\times(i-\mu_i)^2$
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.
$SSV=\sigma_i^2=\sigma_j^2=\sum_{i,j=1}^{N}M(i,j)\times(i-\mu_i)^2$
an inverse difference moment (IDM) also called homogeneity.
$IDM= \sum_{i,j=1}^{N}\frac{M(i,j)}{1+(i-j)^2}$
a sum average indicator (SAv).
$SAv=\sum_{i,j=1}^{N}M(i,j)\times(i+j)$
a sum variance indicator (SVa).
$SVa=\sum_{i,j=1}^{N}M(i,j)\times(i+j-SAv)^2$
a sum entropy indicator (SEn).
$SEn=-\sum_{k=2}^{2N}p_{x+y}(k)\times log(p_{x+y}(k)) ~\mbox{where}~ p_{x+y}(k)=\sum_{i+j=k}M(i,j)$
an entropy indicator (Ent).
$Ent=-\sum_{i,j=1}^{N}M(i,j)\times log(M(i,j))$
a difference variance indicator (DVa).
$DVa=variance(p_{x-y}) ~\mbox{where}~ p_{x-y}(k)=\sum_{|i-j|=k}M(i,j)$
a difference entropy indicator (DEn).
$DEn=-\sum_{k=0}^{N-1}p_{x-y}(k)\times log(p_{x-y}(k))$
two information measures of correlation (IC1 and IC2).
$IC1=\frac{HXY-HXY1}{max(HX,HY)} ~\mbox{where}~ IC2=\sqrt{1-e^{-2\times|HXY2-HXY|}}$
where HX and HY are entropies of px and py such as :
$p_x(i)=\sum_{j=1}^{N}M(i,j) ~\mbox{and}~ p_y(j)=\sum_{i=1}^{N}M(i,j)$
and
$HXY=-\sum_{i,j=1}^{N}M(i,j)\times log(M(i,j))$

$HXY1=-\sum_{i,j=1}^{N}M(i,j)\times log(p_x(i)\times p_y(j))$

$HXY2=-\sum_{i,j=1}^{N}p_x(i)\times p_y(j)\times log(p_x(i)\times p_y(j))$