Line data    Source code

       1             : #pragma once
       2             : 
       3             : #include "LinearOperator.h"
       4             : #include "Geometry.h"
       5             : #include "BoundingBox.h"
       6             : 
       7             : #include "VolumeDescriptor.h"
       8             : #include "DetectorDescriptor.h"
       9             : 
      10             : #include <vector>
      11             : #include <utility>
      12             : 
      13             : #include <Eigen/Geometry>
      14             : 
      15             : namespace elsa
      16             : {
      17             :     /**
      18             :      * @brief Operator representing the discretized X-ray transform in 2d/3d using a simplistic
      19             :      * binary hit/miss method.
      20             :      *
      21             :      * @author Tobias Lasser - initial code, modernization
      22             :      * @author David Frank - rewrite and fixes
      23             :      * @author Maximilian Hornung - modularization
      24             :      * @author Nikola Dinev - fixes
      25             :      *
      26             :      * @tparam data_t data type for the domain and range of the operator, defaulting to real_t
      27             :      *
      28             :      * The volume is traversed along the rays as specified by the Geometry. Each ray is traversed in
      29             :      * a continguous fashion (i.e. along long voxel borders, not diagonally) and each traversed
      30             :      * voxel is counted as a hit with weight 1.
      31             :      *
      32             :      * The geometry is represented as a list of projection matrices (see class Geometry), one for
      33             :      * each acquisition pose.
      34             :      *
      35             :      * Forward projection is accomplished using apply(), backward projection using applyAdjoint().
      36             :      * This projector is matched.
      37             :      *
      38             :      * Warning: This method is not particularly accurate!
      39             :      */
      40             :     template <typename data_t = real_t>
      41             :     class BinaryMethod : public LinearOperator<data_t>
      42             :     {
      43             :     public:
      44             :         /**
      45             :          * @brief Constructor for the binary voxel traversal method.
      46             :          *
      47             :          * @param[in] domainDescriptor describing the domain of the operator (the volume)
      48             :          * @param[in] rangeDescriptor describing the range of the operator (the sinogram)
      49             :          *
      50             :          * The domain is expected to be 2 or 3 dimensional (volSizeX, volSizeY, [volSizeZ]),
      51             :          * the range is expected to be matching the domain (detSizeX, [detSizeY], acqPoses).
      52             :          */
      53             :         // BinaryMethod(const DataDescriptor& domainDescriptor, const DataDescriptor&
      54             :         // rangeDescriptor, const std::vector<Geometry>& geometryList);
      55             : 
      56             :         BinaryMethod(const VolumeDescriptor& domainDescriptor,
      57             :                      const DetectorDescriptor& rangeDescriptor);
      58             : 
      59             :         /// default destructor
      60           0 :         ~BinaryMethod() override = default;
      61             : 
      62             :     protected:
      63             :         /// default copy constructor, hidden from non-derived classes to prevent potential slicing
      64             :         BinaryMethod(const BinaryMethod<data_t>&) = default;
      65             : 
      66             :         /// apply the binary method (i.e. forward projection)
      67             :         void applyImpl(const DataContainer<data_t>& x, DataContainer<data_t>& Ax) const override;
      68             : 
      69             :         /// apply the adjoint of the  binary method (i.e. backward projection)
      70             :         void applyAdjointImpl(const DataContainer<data_t>& y,
      71             :                               DataContainer<data_t>& Aty) const override;
      72             : 
      73             :         /// implement the polymorphic clone operation
      74             :         BinaryMethod<data_t>* cloneImpl() const override;
      75             : 
      76             :         /// implement the polymorphic comparison operation
      77             :         bool isEqual(const LinearOperator<data_t>& other) const override;
      78             : 
      79             :     private:
      80             :         /// the bounding box of the volume
      81             :         BoundingBox _boundingBox;
      82             : 
      83             :         /// Reference to DetectorDescriptor stored in LinearOperator
      84             :         DetectorDescriptor& _detectorDescriptor;
      85             : 
      86             :         /// Reference to VolumeDescriptor stored in LinearOperator
      87             :         VolumeDescriptor& _volumeDescriptor;
      88             : 
      89             :         /// the traversal routine (for both apply/applyAdjoint)
      90             :         template <bool adjoint>
      91             :         void traverseVolume(const DataContainer<data_t>& vector,
      92             :                             DataContainer<data_t>& result) const;
      93             : 
      94             :         /// lift from base class
      95             :         using LinearOperator<data_t>::_domainDescriptor;
      96             :         using LinearOperator<data_t>::_rangeDescriptor;
      97             :     };
      98             : 
      99             : } // namespace elsa