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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkChainCodeToFourierSeriesPathFilter.h
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 __itkChainCodeToFourierSeriesPathFilter_h
#define __itkChainCodeToFourierSeriesPathFilter_h
#include "itkPathToPathFilter.h"
#include "itkOffset.h"
//Templates require interfaces conforming to itkPath.h and itkChainCodePath.h
namespace itk
{
/** \class ChainCodeToFourierSeriesPathFilter
* \brief Filter that produces a Fourier series version of a chain code path
*
* ChainCodeToFourierSeriesPathFilter produces a Fourier series representation
* of a chain code path. By default, the first 8 harmonics (frequency
* coefficients, which include the "DC" term) are computed.
* SetNumberOfHarmonics() can be used to override this value.
* Because the requested number of harmonics may not be able to be computed,
* it is advisable to check the number of harmonics in the actual output.
*
* \ingroup PathFilters
*/
template <class TInputChainCodePath, class TOutputFourierSeriesPath>
class ITK_EXPORT ChainCodeToFourierSeriesPathFilter : public
PathToPathFilter< TInputChainCodePath, TOutputFourierSeriesPath >
{
public:
/** Standard class typedefs. */
typedef ChainCodeToFourierSeriesPathFilter Self;
typedef PathToPathFilter< TInputChainCodePath,
TOutputFourierSeriesPath > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(ChainCodeToFourierSeriesPathFilter, PathToPathFilter);
/** Some convenient typedefs. */
typedef TInputChainCodePath InputPathType;
typedef typename InputPathType::Pointer InputPathPointer;
typedef typename InputPathType::InputType InputPathInputType;
typedef TOutputFourierSeriesPath OutputPathType;
typedef typename OutputPathType::Pointer OutputPathPointer;
typedef typename OutputPathType::InputType OutputPathInputType;
typedef typename InputPathType::IndexType IndexType;
typedef typename InputPathType::OffsetType OffsetType;
typedef typename OutputPathType::VectorType VectorType;
/** Set the number of harmonics to try to compute. By default, the first 8
* harmonics (frequency coefficients, which include the "DC" term) are
* computed. SetNumberOfHarmonics() can be used to override this value. If
* the chain code has too few steps to calculate the desired number of
* harmonics (due to the Nyquist criterion), then as many harmonics as are
* possible (input->NumberOfSteps()/2) will be calculated, but at least 2
* harmonics will always be calculated.*/
itkSetMacro( NumberOfHarmonics, unsigned int )
protected:
ChainCodeToFourierSeriesPathFilter();
virtual ~ChainCodeToFourierSeriesPathFilter() {};
void PrintSelf(std::ostream& os, Indent indent) const;
void GenerateData(void);
private:
ChainCodeToFourierSeriesPathFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
unsigned int m_NumberOfHarmonics;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkChainCodeToFourierSeriesPathFilter.txx"
#endif
#endif
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