/usr/include/ITK-4.5/itkConicShellInteriorExteriorSpatialFunction.hxx is in libinsighttoolkit4-dev 4.5.0-3.
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*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef __itkConicShellInteriorExteriorSpatialFunction_hxx
#define __itkConicShellInteriorExteriorSpatialFunction_hxx
#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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