** This is part of the CTSim program
** Copyright (c) 1983-2001 Kevin Rosenberg
**
-** $Id: projections.h,v 1.27 2001/03/02 02:08:14 kevin Exp $
+** $Id: projections.h,v 1.36 2001/09/24 09:40:42 kevin Exp $
**
**
** This program is free software; you can redistribute it and/or modify
#include "array2dfile.h"
#include "imagefile.h"
#include <complex>
+#include <vector>
+
+
+//used for rebinning divergent beam projections to parallel
+class ParallelRaysumCoordinate {
+public:
+ double m_dT; // Distance from center of origin
+ double m_dTheta; // perpendicular angle to origin
+ double m_dRaysum;
+
+ static bool compareByTheta (ParallelRaysumCoordinate* a, ParallelRaysumCoordinate* b)
+ { return a->m_dTheta == b->m_dTheta ? b->m_dT > a->m_dT : b->m_dTheta > a->m_dTheta; }
+
+ // sort first by T, then Theta
+ static bool compareByT (ParallelRaysumCoordinate* a, ParallelRaysumCoordinate* b)
+ { return a->m_dT == b->m_dT ? b->m_dTheta > a->m_dTheta : b->m_dT > a->m_dT; }
+
+};
+
+class ParallelRaysums {
+public:
+
+ enum {
+ THETA_RANGE_UNCONSTRAINED = 0,
+ THETA_RANGE_NORMALIZE_TO_TWOPI,
+ THETA_RANGE_FOLD_TO_PI,
+ };
+
+ ParallelRaysums (const Projections* pProjections, int iThetaRange);
+ ~ParallelRaysums ();
+
+ typedef std::vector<ParallelRaysumCoordinate*> CoordinateContainer;
+ typedef CoordinateContainer::iterator CoordinateIterator;
+
+ CoordinateContainer& getCoordinates() {return m_vecpCoordinates;}
+ int getNumCoordinates() const {return m_iNumCoordinates;}
+ void getLimits (double* dMinT, double* dMaxT, double* dMinTheta, double* dMaxTheta) const;
+ CoordinateContainer& getSortedByT();
+ CoordinateContainer& getSortedByTheta();
+ double interpolate (double* pdX, double* pdY, int n, double dXValue, int* iLastFloor = NULL);
+ void getThetaAndRaysumsForT (int iT, double* pdTheta, double* pdRaysum);
+ void getDetPositions (double* pdDetPos);
+
+private:
+ CoordinateContainer m_vecpCoordinates;
+ CoordinateContainer m_vecpSortedByT;
+ CoordinateContainer m_vecpSortedByTheta;
+ ParallelRaysumCoordinate* m_pCoordinates;
+ int m_iNumCoordinates;
+ int m_iNumView;
+ int m_iNumDet;
+ int m_iThetaRange;
+};
+
+
// Projections
class Projections
void printProjectionData ();
void printScanInfo (std::ostringstream& os) const;
+ int Helical180LI(int interpView);
+ int Helical180LI_Equiangular(int interpView);
+ int HalfScanFeather(void);
+
bool read (const std::string& fname);
bool read (const char* fname);
bool write (const char* fname);
bool detarrayRead (fnetorderstream& fs, DetectorArray& darray, const int view_num);
bool detarrayWrite (fnetorderstream& fs, const DetectorArray& darray, const int view_num);
+ Projections* interpolateToParallel() const;
+
bool convertPolar (ImageFile& rIF, int iInterpolation);
bool convertFFTPolar (ImageFile& rIF, int iInterpolation, int iZeropad);
- bool calcArrayPolarCoordinates (unsigned int nx, unsigned int ny, double** ppdView, double** ppdDet);
+ void calcArrayPolarCoordinates (unsigned int nx, unsigned int ny, double** ppdView, double** ppdDet,
+ int iNumDetWithZeros, double dZeropadRatio, double dDetInc);
void interpolatePolar (ImageFileArray& v, ImageFileArray& vImag, unsigned int nx, unsigned int ny, std::complex<double>** ppcDetValue,
- double** ppdDet, double** ppdView, unsigned int nView, unsigned int nDet, int iInterpolate);
+ double** ppdDet, double** ppdView, unsigned int nView, unsigned int nDet, unsigned int nDetWithZeros,
+ int iInterpolate);
bool reconstruct (ImageFile& im, const char* const filterName, double filt_param, const char* const filterMethodName, const int zeropad, const char* frequencyFilterName, const char* const interpName, int interp_param, const char* const backprojName, const int trace) const;
int geometry() const {return m_geometry;}
double focalLength() const {return m_dFocalLength;}
double sourceDetectorLength() const { return m_dSourceDetectorLength;}
-
+ double viewDiameter() const {return m_dViewDiameter; }
double phmLen() const { return m_dViewDiameter / SQRT2; }
void setPhmLen(double phmLen) { m_dViewDiameter = phmLen * SQRT2; }