/usr/include/ITK-4.5/itkVectorCentralDifferenceImageFunction.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 __itkVectorCentralDifferenceImageFunction_h
#define __itkVectorCentralDifferenceImageFunction_h
#include "itkImageFunction.h"
#include "itkMatrix.h"
namespace itk
{
/**
* \class VectorCentralDifferenceImageFunction
* \brief Calculate the derivative by central differencing.
*
* This class is templated over the input image type and
* the coordinate representation type (e.g. float or double).
*
* Possible improvements:
* - the use of Neighborhood operators may improve efficiency.
*
* \author Tom Vercauteren, INRIA & Mauna Kea Technologies
*
* This implementation was taken from the Insight Journal paper:
* http://hdl.handle.net/1926/510
*
* \ingroup ImageFunctions
* \ingroup ITKReview
*/
template<
typename TInputImage,
typename TCoordRep = float >
class VectorCentralDifferenceImageFunction:
public ImageFunction< TInputImage,
Matrix< double,
TInputImage::PixelType::Dimension,
TInputImage::ImageDimension >,
TCoordRep >
{
public:
typedef typename TInputImage::PixelType InputPixelType;
/** Extract the vector dimension from the pixel template parameter. */
itkStaticConstMacro(Dimension, unsigned int,
InputPixelType::Dimension);
/** Dimension underlying input image. */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage::ImageDimension);
/** Standard class typedefs. */
typedef VectorCentralDifferenceImageFunction Self;
typedef ImageFunction< TInputImage,
Matrix< double, itkGetStaticConstMacro(Dimension),
itkGetStaticConstMacro(ImageDimension) >,
TCoordRep > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Run-time type information (and related methods). */
itkTypeMacro(VectorCentralDifferenceImageFunction, ImageFunction);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** InputImageType typedef support. */
typedef TInputImage InputImageType;
/** OutputType typdef support. */
typedef typename Superclass::OutputType OutputType;
/** Index typedef support. */
typedef typename Superclass::IndexType IndexType;
/** ContinuousIndex typedef support. */
typedef typename Superclass::ContinuousIndexType ContinuousIndexType;
/** Point typedef support. */
typedef typename Superclass::PointType PointType;
/** Evalulate the image derivative by central differencing at specified index.
*
* No bounds checking is done.
* The point is assume to lie within the image buffer.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
virtual OutputType EvaluateAtIndex(const IndexType & index) const;
/** Evalulate the image derivative by central differencing at non-integer
* positions.
*
* No bounds checking is done.
* The point is assume to lie within the image buffer.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
virtual OutputType Evaluate(const PointType & point) const
{
IndexType index;
this->ConvertPointToNearestIndex(point, index);
return this->EvaluateAtIndex(index);
}
virtual OutputType EvaluateAtContinuousIndex(
const ContinuousIndexType & cindex) const
{
IndexType index;
this->ConvertContinuousIndexToNearestIndex(cindex, index);
return this->EvaluateAtIndex(index);
}
/** The UseImageDirection flag determines whether image derivatives are
* computed with respect to the image grid or with respect to the physical
* space. When this flag is ON the derivatives are computed with respect to
* the coordinate system of physical space. The difference is whether we take
* into account the image Direction or not. The flag ON will take into
* account the image direction and will result in an extra matrix
* multiplication compared to the amount of computation performed when the
* flag is OFF.
* The default value of this flag is On.
*/
itkSetMacro(UseImageDirection, bool);
itkGetConstMacro(UseImageDirection, bool);
itkBooleanMacro(UseImageDirection);
protected:
VectorCentralDifferenceImageFunction();
~VectorCentralDifferenceImageFunction(){}
void PrintSelf(std::ostream & os, Indent indent) const;
private:
VectorCentralDifferenceImageFunction(const Self &); //purposely not
// implemented
void operator=(const Self &); //purposely not
// implemented
// flag to take or not the image direction into account
// when computing the derivatives.
bool m_UseImageDirection;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkVectorCentralDifferenceImageFunction.hxx"
#endif
#endif
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