PostsmoothingBackProjectorByBin.h

Go to the documentation of this file.

//
//
/*
    Copyright (C) 2002- 2007, Hammersmith Imanet
    Copyright (C) 2019, University College London

    This file is part of STIR.

    SPDX-License-Identifier: Apache-2.0


    See STIR/LICENSE.txt for details
*/
#ifndef __stir_recon_buildblock_PostsmoothingBackProjectorByBin__H__
#define __stir_recon_buildblock_PostsmoothingBackProjectorByBin__H__

#include "stir/RegisteredParsingObject.h"
#include "stir/recon_buildblock/BackProjectorByBin.h"
#include "stir/shared_ptr.h"

START_NAMESPACE_STIR

template <typename elemT>
class Viewgram;
template <typename DataT>
class DataProcessor;
class PostsmoothingBackProjectorByBin : public RegisteredParsingObject<PostsmoothingBackProjectorByBin, BackProjectorByBin>
{
#ifdef SWIG
  // work-around swig problem. It gets confused when using a private (or protected)
  // typedef in a definition of a public typedef/member
public:
#else
private:
#endif
  typedef BackProjectorByBin base_type;

public:
  static const char* const registered_name;

  PostsmoothingBackProjectorByBin();

  ~PostsmoothingBackProjectorByBin() override;


  void set_up(const shared_ptr<const ProjDataInfo>& proj_data_info_ptr,
              const shared_ptr<const DiscretisedDensity<3, float>>& density_info_ptr // TODO should be Info only
              ) override;

  PostsmoothingBackProjectorByBin(const shared_ptr<BackProjectorByBin>& original_back_projector_ptr,
                                  const shared_ptr<DataProcessor<DiscretisedDensity<3, float>>>&);

  // Informs on which symmetries the projector handles
  // It should get data related by at least those symmetries.
  // Otherwise, a run-time error will occur (unless the derived
  // class has other behaviour).
  const DataSymmetriesForViewSegmentNumbers* get_symmetries_used() const override;

  BackProjectorByBin* get_original_back_projector_ptr() const;

  PostsmoothingBackProjectorByBin* clone() const override;

private:
  shared_ptr<BackProjectorByBin> original_back_projector_ptr;

#ifdef STIR_PROJECTORS_AS_V3
  void actual_back_project(DiscretisedDensity<3, float>&,
                           const RelatedViewgrams<float>&,
                           const int min_axial_pos_num,
                           const int max_axial_pos_num,
                           const int min_tangential_pos_num,
                           const int max_tangential_pos_num);
#endif
  void actual_back_project(const RelatedViewgrams<float>&,
                           const int min_axial_pos_num,
                           const int max_axial_pos_num,
                           const int min_tangential_pos_num,
                           const int max_tangential_pos_num) override;

  void actual_back_project(DiscretisedDensity<3, float>& density, const Bin& bin);

  shared_ptr<DiscretisedDensity<3, float>> filtered_density_sptr;

  void set_defaults() override;
  void initialise_keymap() override;
  bool post_processing() override;
};

END_NAMESPACE_STIR

#endif