/usr/include/ITK-4.5/itkDerivativeOperator.h 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 __itkDerivativeOperator_h
#define __itkDerivativeOperator_h
#include "itkNeighborhoodOperator.h"
namespace itk
{
/**
* \class DerivativeOperator
* \brief A NeighborhoodOperator for taking an n-th order derivative
* at a pixel
*
* DerivativeOperator's coefficients are a tightest-fitting convolution
* kernel for calculating the n-th order directional derivative at a pixel.
* DerivativeOperator is a directional NeighborhoodOperator that should be
* applied to a Neighborhood or NeighborhoodPointer using the inner product
* method.
*
* An example operator to compute X derivatives of a 2D image can be
* created with:
* \code
* typedef itk::DerivativeOperator<float, 2> DerivativeOperatorType;
* DerivativeOperatorType derivativeOperator;
* derivativeOperator.SetDirection(0); // X dimension
* itk::Size<2> radius;
* radius.Fill(1); // A radius of 1 in both dimensions is a 3x3 operator
* derivativeOperator.CreateToRadius(radius);
* \endcode
* and creates a kernel that looks like:
* \code
* 0 0 0
* 0.5 0 -0.5
* 0 0 0
* \endcode
*
* \sa NeighborhoodOperator
* \sa Neighborhood
* \sa ForwardDifferenceOperator
* \sa BackwardDifferenceOperator
*
* \ingroup Operators
* \ingroup ITKCommon
*
* \wiki
* \wikiexample{Operators/DerivativeOperator,Create a derivative kernel}
* \endwiki
*/
template< typename TPixel, unsigned int VDimension = 2,
typename TAllocator = NeighborhoodAllocator< TPixel > >
class DerivativeOperator:
public NeighborhoodOperator< TPixel, VDimension, TAllocator >
{
public:
/** Standard class typedefs. */
typedef DerivativeOperator Self;
typedef NeighborhoodOperator<
TPixel, VDimension, TAllocator > Superclass;
typedef typename Superclass::PixelType PixelType;
typedef typename Superclass::PixelRealType PixelRealType;
/** Constructor. */
DerivativeOperator():m_Order(1) {}
/** Copy constructor. */
DerivativeOperator(const Self & other):
NeighborhoodOperator< TPixel, VDimension, TAllocator >(other)
{ m_Order = other.m_Order; }
/** Assignment operator */
Self & operator=(const Self & other)
{
if(this != &other)
{
Superclass::operator=(other);
m_Order = other.m_Order;
}
return *this;
}
/** Sets the order of the derivative. */
void SetOrder(const unsigned int & order)
{
this->m_Order = order;
}
/** Returns the order of the derivative. */
unsigned int GetOrder() const { return m_Order; }
/** Prints some debugging information */
virtual void PrintSelf(std::ostream & os, Indent i) const
{
os << i << "DerivativeOperator { this=" << this
<< ", m_Order = " << m_Order << "}" << std::endl;
Superclass::PrintSelf( os, i.GetNextIndent() );
}
protected:
/** Typedef support for coefficient vector type. Necessary to
* work around compiler bug on VC++. */
typedef typename Superclass::CoefficientVector CoefficientVector;
/** Calculates operator coefficients. */
CoefficientVector GenerateCoefficients();
/** Arranges coefficients spatially in the memory buffer. */
void Fill(const CoefficientVector & coeff)
{ Superclass::FillCenteredDirectional(coeff); }
private:
/** Order of the derivative. */
unsigned int m_Order;
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkDerivativeOperator.hxx"
#endif
#endif
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