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itkGaussianSpatialObject.txx
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itkGaussianSpatialObject.txx
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkGaussianSpatialObject.txx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __GaussianSpatialObject_txx
#define __GaussianSpatialObject_txx
#include <math.h>
#include "itkGaussianSpatialObject.h"
namespace itk
{
/** Constructor */
template< unsigned int TDimension >
GaussianSpatialObject< TDimension >
::GaussianSpatialObject()
{
this->SetTypeName("GaussianSpatialObject");
this->SetDimension(TDimension);
m_Radius = 1.0;
m_Maximum = 1.0;
}
/** Destructor */
template< unsigned int TDimension >
GaussianSpatialObject< TDimension >
::~GaussianSpatialObject()
{
}
/** The z-score is the root mean square of the z-scores along
* each principal axis. */
template< unsigned int TDimension >
typename GaussianSpatialObject< TDimension >::ScalarType
GaussianSpatialObject< TDimension >
::SquaredZScore( const PointType& point ) const
{
typename TransformType::Pointer inverse = TransformType::New();
if(!this->GetIndexToWorldTransform()->GetInverse(inverse))
{
return false;
}
PointType transformedPoint = inverse->TransformPoint(point);
ScalarType r = 0;
for( unsigned int i=0; i<TDimension; i++ )
{
r += transformedPoint[i] * transformedPoint[i];
}
return r;
}
/** Test whether a point is inside or outside the object
* For computational speed purposes, it is faster if the method does not
* check the name of the class and the current depth */
template< unsigned int TDimension >
bool
GaussianSpatialObject< TDimension >
::IsInside( const PointType & point) const
{
if ( SquaredZScore( point ) < m_Radius * m_Radius )
{
return true;
}
return false;
}
/** Test if the given point is inside the boundary of the spatial
* object */
template< unsigned int TDimension >
bool
GaussianSpatialObject< TDimension >
::IsInside( const PointType & point, unsigned int depth, char * name ) const
{
itkDebugMacro( "Checking whether the point ["
<< point << "] is inside the Gaussian" );
if(name == NULL)
{
if(IsInside(point))
{
return true;
}
}
else if(strstr(typeid(Self).name(), name))
{
if(IsInside(point))
{
return true;
}
}
return Superclass::IsInside(point, depth, name);
}
/** Compute the bounds of the Gaussian (as determined by the
* specified radius). */
template< unsigned int TDimension >
bool
GaussianSpatialObject< TDimension >
::ComputeLocalBoundingBox() const
{
if( this->GetBoundingBoxChildrenName().empty()
|| strstr(typeid(Self).name(), this->GetBoundingBoxChildrenName().c_str()) )
{
PointType pnt;
PointType pnt2;
for( unsigned int i=0; i<TDimension; i++ )
{
pnt[i] = -m_Radius;
pnt2[i] = m_Radius;
}
pnt = this->GetIndexToWorldTransform()->TransformPoint(pnt);
pnt2 = this->GetIndexToWorldTransform()->TransformPoint(pnt2);
const_cast<BoundingBoxType *>(this->GetBounds())->SetMinimum(pnt);
const_cast<BoundingBoxType *>(this->GetBounds())->SetMaximum(pnt2);
}
return true;
}
/** Returns the value at one point */
template< unsigned int TDimension >
bool
GaussianSpatialObject< TDimension >
::ValueAt( const PointType & point, ScalarType & value, unsigned int depth,
char * name ) const
{
itkDebugMacro( "Getting the value of a Gaussian at " << point );
if(name == NULL || strstr(typeid(Self).name(), name) )
{
double zsq = this->SquaredZScore(point);
value = m_Maximum * (ScalarType)exp( -zsq / 2.0 );
return true;
}
return Superclass::ValueAt( point, value, depth, name );
}
/** Returns the sigma=m_Radius level set of the Gaussian function, as an
* EllipseSpatialObject. */
template< unsigned int TDimension >
typename EllipseSpatialObject< TDimension >::Pointer
GaussianSpatialObject< TDimension >
::GetEllipsoid() const
{
typedef itk::EllipseSpatialObject< TDimension > EllipseType;
typename EllipseType::Pointer ellipse = EllipseType::New();
ellipse->SetRadius( m_Radius );
ellipse->GetIndexToObjectTransform()->SetCenter(
this->GetIndexToObjectTransform()->GetCenter() );
ellipse->GetIndexToObjectTransform()->SetMatrix(
this->GetIndexToObjectTransform()->GetMatrix() );
ellipse->GetIndexToObjectTransform()->SetOffset(
this->GetIndexToObjectTransform()->GetOffset() );
ellipse->GetObjectToWorldTransform()->SetCenter(
this->GetObjectToWorldTransform()->GetCenter() );
ellipse->GetObjectToWorldTransform()->SetMatrix(
this->GetObjectToWorldTransform()->GetMatrix() );
ellipse->GetObjectToWorldTransform()->SetOffset(
this->GetObjectToWorldTransform()->GetOffset() );
ellipse->GetIndexToWorldTransform()->SetCenter(
this->GetIndexToWorldTransform()->GetCenter() );
ellipse->GetIndexToWorldTransform()->SetMatrix(
this->GetIndexToWorldTransform()->GetMatrix() );
ellipse->GetIndexToWorldTransform()->SetOffset(
this->GetIndexToWorldTransform()->GetOffset() );
// ellipse->GetWorldToIndexTransform()->SetParameters(
// this->GetWorldToIndexTransform()->GetParameters() );
return ellipse;
}
/** Print Self function */
template< unsigned int TDimension >
void
GaussianSpatialObject< TDimension >
::PrintSelf( std::ostream& os, Indent indent ) const
{
Superclass::PrintSelf(os, indent);
os << "Maximum: " << m_Maximum << std::endl;
os << "Radius: " << m_Radius << std::endl;
}
} // end namespace itk
#endif