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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkConicShellInteriorExteriorSpatialFunction.txx,v $
Language: C++
Date: $Date: 2006-03-19 23:22:57 $
Version: $Revision: 1.17 $
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 __itkConicShellInteriorExteriorSpatialFunction_txx
#define __itkConicShellInteriorExteriorSpatialFunction_txx
#include "itkConicShellInteriorExteriorSpatialFunction.h"
namespace itk
{
template <unsigned int VDimension, typename TInput>
ConicShellInteriorExteriorSpatialFunction<VDimension, TInput>
::ConicShellInteriorExteriorSpatialFunction()
{
m_Origin.Fill(0.0);
m_OriginGradient.Fill(0.0);
m_DistanceMin = 0;
m_DistanceMax = 0;
m_Polarity = 0;
m_Epsilon = 0;
}
template <unsigned int VDimension, typename TInput>
ConicShellInteriorExteriorSpatialFunction<VDimension, TInput>
::~ConicShellInteriorExteriorSpatialFunction()
{
}
template <unsigned int VDimension, typename TInput>
void
ConicShellInteriorExteriorSpatialFunction<VDimension, TInput>
::SetOriginGradient(GradientType grad)
{
m_OriginGradient = grad;
// Normalize the origin gradient
m_OriginGradient.GetVnlVector().normalize();
}
template <unsigned int VDimension, typename TInput>
typename ConicShellInteriorExteriorSpatialFunction<VDimension, TInput>
::OutputType
ConicShellInteriorExteriorSpatialFunction<VDimension, TInput>
::Evaluate(const InputType& position) const
{
// As from the header...
/**
* We are creating search areas from BoundaryPoint1 in which to look for
* candidate BoundaryPoint2's with which to form core atoms. Assume the
* "worst case" that BoundaryPoint2 is somewhere in that search area pointing
* directly at BoundaryPoint1.
*
* The search area (ConicShell?) from each BoundaryPoint1 has the following
* parameters:
*
* DistanceMax and DistanceMin from the location of the BoundaryPoint
*
* AngleMax from the line along the gradient at the boundary point.
* This is determined in n dimensions by taking the dot product of
* two vectors,
* (1) the normalized gradient at BoundaryPoint1 and
* (2) the normalized vector from BoundaryPoint1 to BoundaryPoint2.
*
* If the absolute value of that dot product is greater than (1 - epsilon)
* then you are in the ConicShell. This epsilon is the same one determining
* face-to-faceness in the IEEE TMI paper.
*/
// Set the direction of the gradient
// O means the direction that the gradient is pointing,
// 1 means the opposite direction
typedef Vector<double, VDimension> VectorType;
// Compute the vector from the origin to the point we're testing
VectorType vecOriginToTest = position - m_Origin;
// Compute the length of this vector
// double vecDistance = vecOriginToTest.GetVnlVector().magnitude();
double vecDistance = vecOriginToTest.GetNorm();
// Check to see if this an allowed distance
if( !( (vecDistance > m_DistanceMin)&&(vecDistance < m_DistanceMax) ) )
return 0; // not inside the conic shell
// Normalize it
// vecOriginToTest.GetVnlVector().normalize();
vecOriginToTest.Normalize();
// Create a temp vector to get around const problems
GradientType originGradient = m_OriginGradient;
// Now compute the dot product
double dotprod = originGradient * vecOriginToTest;
if(m_Polarity==1)
{
dotprod = dotprod * -1;
}
// Check to see if it meet's the angle criterior
OutputType result;
if( dotprod > (1 - m_Epsilon) )
{
result = 1; // it's inside the shell
}
else
{
result = 0; // it's not inside the shell
}
return result;
}
template <unsigned int VDimension, typename TInput>
void
ConicShellInteriorExteriorSpatialFunction<VDimension, TInput>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
unsigned int i;
os << indent << "Origin: [";
for (i=0; i < VDimension - 1; i++)
{
os << m_Origin[i] << ", ";
}
os << "]" << std::endl;
os << indent << "Gradient at origin: [";
for (i=0; i < VDimension - 1; i++)
{
os << m_OriginGradient[i] << ", ";
}
os << "]" << std::endl;
os << indent << "DistanceMin: " << m_DistanceMin << std::endl;
os << indent << "DistanceMax: " << m_DistanceMax << std::endl;
os << indent << "Epsilon: " << m_Epsilon << std::endl;
os << indent << "Polarity: " << m_Polarity << std::endl;
}
} // end namespace itk
#endif
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