otbRealImageToComplexImageFilter.h

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/*
 * Copyright (C) 2005-2024 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * 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
 *
 * 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 otbRealImageToComplexImageFilter_h
#define otbRealImageToComplexImageFilter_h
 
#include "itkUnaryFunctorImageFilter.h"
#include "vnl/vnl_math.h"
 
namespace otb
{
 
namespace Function
{
 
template <class TInputImageRealPart, class TOutput>
class RealToComplex
{
public:
  typedef typename TOutput::value_type OutputValueType;
 
  RealToComplex()
  {
  }
  ~RealToComplex()
  {
  }
  bool operator!=(const RealToComplex&) const
  {
    return false;
  }
  bool operator==(const RealToComplex& other) const
  {
    return !(*this != other);
  }
  inline TOutput operator()(const TInputImageRealPart& real) const
  {
    return TOutput(static_cast<OutputValueType>(real), static_cast<OutputValueType>(0.0));
  }
};
}
 
template <class TInputImageRealPart, class TOutputImage>
class ITK_EXPORT RealImageToComplexImageFilter
    : public itk::UnaryFunctorImageFilter<TInputImageRealPart, TOutputImage,
                                          Function::RealToComplex<typename TInputImageRealPart::PixelType, typename TOutputImage::PixelType>>
{
public:
  typedef RealImageToComplexImageFilter Self;
  typedef itk::UnaryFunctorImageFilter<TInputImageRealPart, TOutputImage,
                                       Function::RealToComplex<typename TInputImageRealPart::PixelType, typename TOutputImage::PixelType>>
                                        Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;
 
  itkNewMacro(Self);
 
  itkTypeMacro(RealImageToComplexImageFilter, UnaryFunctorImageFilter);
 
  typedef typename TInputImageRealPart::PixelType                 InputRealPartPixelType;
  typedef typename TOutputImage::PixelType                        OutputPixelType;
  typedef typename itk::NumericTraits<OutputPixelType>::ValueType OutputPixelValueType;
 
protected:
  RealImageToComplexImageFilter()
  {
  }
  ~RealImageToComplexImageFilter() override
  {
  }
 
private:
  RealImageToComplexImageFilter(const Self&) = delete;
  void operator=(const Self&) = delete;
};
 
} // end namespace otb
 
#endif