rtkParkerShortScanImageFilter.h

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/*=========================================================================
 *
 *  Copyright RTK 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
 *
 *         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 rtkParkerShortScanImageFilter_h
#define rtkParkerShortScanImageFilter_h

#include <itkInPlaceImageFilter.h>

#include "rtkThreeDCircularProjectionGeometry.h"
#include "rtkConfiguration.h"

namespace rtk
{

template <class TInputImage, class TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT ParkerShortScanImageFilter : public itk::InPlaceImageFilter<TInputImage, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(ParkerShortScanImageFilter);

  using Self = ParkerShortScanImageFilter;
  using Superclass = itk::ImageToImageFilter<TInputImage, TOutputImage>;
  using Pointer = itk::SmartPointer<Self>;
  using ConstPointer = itk::SmartPointer<const Self>;

  using InputImageType = TInputImage;
  using OutputImageType = TOutputImage;
  using OutputImageRegionType = typename OutputImageType::RegionType;
  using WeightImageType = itk::Image<typename TOutputImage::PixelType, 1>;

  using GeometryType = ThreeDCircularProjectionGeometry;
  using GeometryPointer = GeometryType::Pointer;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(ParkerShortScanImageFilter);

  itkGetModifiableObjectMacro(Geometry, GeometryType);
  itkSetObjectMacro(Geometry, GeometryType);

  itkGetMacro(AngularGapThreshold, double);
  itkSetMacro(AngularGapThreshold, double);

protected:
  ParkerShortScanImageFilter() = default;
  ~ParkerShortScanImageFilter() override = default;

  void
  VerifyPreconditions() const override;

  void
  GenerateInputRequestedRegion() override;

  void
  DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;

  double m_Delta;

  double m_FirstAngle;

  bool m_IsShortScan{ false };

private:
  GeometryPointer m_Geometry;

  double m_InferiorCorner;
  double m_SuperiorCorner;

  double m_AngularGapThreshold{ itk::Math::pi / 9 };
}; // end of class

} // end namespace rtk

#ifndef ITK_MANUAL_INSTANTIATION
#  include "rtkParkerShortScanImageFilter.hxx"
#endif

#endif