Vertex Class Reference

a vertex in a graph More...

#include <Vertex.h>

List of all members.

Public Member Functions
	Vertex (VertexLabel l, SamplePos *sposs, SampleValue **svalues, EmbValue t)
	~Vertex (void)
SamplePos	getSamplePos (unsigned short i) const
SampleValue *	getSampleValue (unsigned short i) const
UWORD32	getDegree (void) const
Edge *	getShortestEdge (void) const
void	updateShortestEdge (void)
void	markDeleted (void)
void	unmarkDeleted (void)
VertexLabel	getLabel (void) const
void	setLabel (VertexLabel l)
void	setSampleOccurenceIt (unsigned short i, std::list< SampleOccurence >::iterator it)
EmbValue	getEmbeddedValue (void) const
EmbValue	getTargetValue (unsigned short i) const
void	print (unsigned short spc=0) const
void	printEdges (void) const
Private Attributes
VertexLabel	Label
	the vertex label of this vertex
SamplePos *	SamplePositions
	the sample positions of the samples described by this vertex in the CvrStgFile
SampleValue **	SampleValues
	the sample values at the SamplePositions
EmbValue *	TargetValues
	the target values for the sample values (exactly one of them has to be reached (and the other left unchanged) to embed this vertex)
std::list< SampleOccurence >::iterator *	SampleOccurenceIts
	point to entries in std::lists of sample occurences in the graph
Edge *	ShortestEdge
	the shortest edge of this vertex (as calculated by updateShortestEdge)
bool	valid
	true iff this vertex is not deleted
unsigned short	SelfDegree
	the number of loop edges (loop edges are not valid edges)

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Detailed Description

A vertex represents a bit that will cause a change to the cover-stego-file to be embedded. A vertex consists of k samples (that is k sample values at k (different) positions in the cover-stego-file), where k is TheCvrStgFile->getNumSamplesPerVertex(). One of these k samples must be changed to an opposite sample to embed the bit that corresponds to this vertex.

NOTE: Vertex relies on the Globals object pointed to by the Globs pointer. This means that it must be set correctly before using any method of a Vertex object.

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Constructor & Destructor Documentation

Vertex::Vertex	(	VertexLabel	l,
		SamplePos *	sposs,
		SampleValue **	svalues,
		EmbValue	t
	)

construct a new vertex object

Parameters:

	l	the vertex label for this vertex
	sposs	the array (with length g->getSamplesPerVertex()) of the positions of the samples
	svalues	the array (with length g->getSamplesPerVertex()) of (unique (!)) pointers to the sample values
	t	the target value for the whole vertex - the value that should be returned by getEmbeddedValue() after the embedding

Vertex::~Vertex

(

void

)

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Member Function Documentation

SamplePos Vertex::getSamplePos

(

unsigned short

i

)

const [inline]

get the i-th sample position

Parameters:

i

an index of a sample in this vertex (must be < TheCvrStgFile->getNumSamplesPerVertex())

Returns:

the position of the sample in the associated cvrstgfile

SampleValue* Vertex::getSampleValue

(

unsigned short

i

)

const [inline]

get the i-th sample value

Parameters:

i

an index of a sample in this vertex (must be < TheCvrStgFile->getNumSamplesPerVertex())

Returns:

the value of the sample in the associated cvrstgfile

UWORD32 Vertex::getDegree

(

void

)

const

get the degree of this vertex

Edge* Vertex::getShortestEdge

(

void

)

const [inline]

get the shortest edge of this vertex

void Vertex::updateShortestEdge

(

void

)

find shortest edge of this vertex and save result to ShortestEdge

void Vertex::markDeleted

(

void

)

if this vertex is valid, mark it as deleted

void Vertex::unmarkDeleted

(

void

)

if this vertex is marked as deleted, undo this

VertexLabel Vertex::getLabel

(

void

)

const [inline]

void Vertex::setLabel

(

VertexLabel

l

)

[inline]

void Vertex::setSampleOccurenceIt	(	unsigned short	i,
		std::list< SampleOccurence >::iterator	it
	)			[inline]

EmbValue Vertex::getEmbeddedValue

(

void

)

const

EmbValue Vertex::getTargetValue

(

unsigned short

i

)

const [inline]

void Vertex::print

(

unsigned short

spc = 0

)

const

void Vertex::printEdges

(

void

)

const

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Member Data Documentation

VertexLabel Vertex::Label [private]

SamplePos* Vertex::SamplePositions [private]

SampleValue** Vertex::SampleValues [private]

EmbValue* Vertex::TargetValues [private]

std::list<SampleOccurence>::iterator* Vertex::SampleOccurenceIts [private]

Edge* Vertex::ShortestEdge [private]

bool Vertex::valid [private]

unsigned short Vertex::SelfDegree [private]

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The documentation for this class was generated from the following files:

• Vertex.h
• Vertex.cc

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