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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 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
* \ingroup ITKPath
*/
template <typename TInputChainCodePath, typename TOutputFourierSeriesPath>
class ITK_TEMPLATE_EXPORT ChainCodeToFourierSeriesPathFilter
: public PathToPathFilter<TInputChainCodePath, TOutputFourierSeriesPath>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ChainCodeToFourierSeriesPathFilter);
/** Standard class type aliases. */
using Self = ChainCodeToFourierSeriesPathFilter;
using Superclass = PathToPathFilter<TInputChainCodePath, TOutputFourierSeriesPath>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(ChainCodeToFourierSeriesPathFilter);
/** Some convenient type alias. */
using InputPathType = TInputChainCodePath;
using InputPathPointer = typename InputPathType::Pointer;
using InputPathInputType = typename InputPathType::InputType;
using OutputPathType = TOutputFourierSeriesPath;
using OutputPathPointer = typename OutputPathType::Pointer;
using OutputPathInputType = typename OutputPathType::InputType;
using IndexType = typename InputPathType::IndexType;
using OffsetType = typename InputPathType::OffsetType;
using VectorType = typename OutputPathType::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();
~ChainCodeToFourierSeriesPathFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
void
GenerateData() override;
private:
unsigned int m_NumberOfHarmonics{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkChainCodeToFourierSeriesPathFilter.hxx"
#endif
#endif
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