X-Git-Url: http://git.kpe.io/?p=ctsim.git;a=blobdiff_plain;f=include%2Fbackprojectors.h;h=297d8d156f36fce31c101415027716bf2e631cb3;hp=923cee1291e68dd59b0453b1ac74ce21d3015cda;hb=3fba6928127cd65870bdcd96c8114ad5894247ae;hpb=c481fbf2890e6e3a0a5479a9e53e685634ce411a

diff --git a/include/backprojectors.h b/include/backprojectors.h
index 923cee1..297d8d1 100644
--- a/include/backprojectors.h
+++ b/include/backprojectors.h
@@ -9,11 +9,7 @@
 **  This is part of the CTSim program
 **  Copyright (C) 1983-2000 Kevin Rosenberg
 **
-**  $Id: backprojectors.h,v 1.1 2000/06/10 23:00:17 kevin Exp $
-**  $Log: backprojectors.h,v $
-**  Revision 1.1  2000/06/10 23:00:17  kevin
-**  *** empty log message ***
-**
+**  $Id: backprojectors.h,v 1.9 2000/07/13 07:03:21 kevin Exp $
 **
 **  This program is free software; you can redistribute it and/or modify
 **  it under the terms of the GNU General Public License (version 2) as
@@ -29,32 +25,103 @@
 **  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 ******************************************************************************/
 
+
+#undef HAVE_BSPLINE_INTERP
+
+class Backproject;
+
+class Backprojector
+{
+ public:
+  typedef  enum {
+    BPROJ_INVALID,
+    BPROJ_TRIG,
+    BPROJ_TABLE,
+    BPROJ_DIFF,
+    BPROJ_DIFF2,
+    BPROJ_IDIFF2,
+    BPROJ_IDIFF3
+} BackprojectID;
+
+  typedef enum {
+    INTERP_INVALID,
+    INTERP_NEAREST,      // Nearest neighbor
+#if HAVE_BSPLINE_INTERP
+    I_BSPLINE,
+    I_1BSPLINE,      // 1st order B-Spline 
+    I_2BSPLINE,
+    I_3BSPLINE,
+#endif
+    INTERP_LINEAR,        // Linear interpolation 
+    INTERP_FREQ_PREINTERPOLATION,
+  } InterpolationID;
+
+  static const char BPROJ_TRIG_STR[]=     "trig";
+  static const char BPROJ_TABLE_STR[]=    "table";
+  static const char BPROJ_DIFF_STR[]=     "diff";
+  static const char BPROJ_DIFF2_STR[]=    "diff2";
+  static const char BPROJ_IDIFF2_STR[]=   "idiff2";
+  static const char BPROJ_IDIFF3_STR[]=   "idiff3";
+ 
+  static const char INTERP_NEAREST_STR[]=  "nearest";
+  static const char INTERP_LINEAR_STR[]=   "linear";
+  static const char INTERP_BSPLINE_STR[]=  "bspline";
+  static const char INTERP_FREQ_PREINTERPOLATION_STR[]= "freq_preinterpolation";
+
+  Backprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName, const int interpFactor);
+
+  ~Backprojector (void);
+		 
+  void BackprojectView (const double* const viewData, const double viewAngle);
+
+  bool fail(void) const {return m_fail;}
+  const string& failMessage(void) const {return m_failMessage;}
+
+ private:
+  string m_nameBackproject;
+  string m_nameInterpolation;
+  BackprojectID m_idBackproject;
+  InterpolationID m_idInterpolation;
+  Backproject* m_pBackprojectImplem;
+  bool m_fail;
+  string m_failMessage;
+
+  static const InterpolationID convertInterpolationNameToID (const char* const interpName);
+  static const char* convertInterpolationIDToName (const InterpolationID interpID);
+  static const BackprojectID convertBackprojectNameToID (const char* const bprojName);
+  static const char* convertBackprojectIDToName (const BackprojectID bprojID);
+
+  bool initBackprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName, const int interpFactor);
+};
+
+
 class Backproject
 {
  public:
-    Backproject (const RAYSUM* rs, ImageFile& im, InterpolationType interpType);
+    Backproject (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor);
 
     virtual ~Backproject ();
 
-    virtual void BackprojectView (const double* const t, const double view_angle) {};
+    virtual void BackprojectView (const double* const viewData, const double viewAngle) {};
 
  protected:
     void ScaleImageByRotIncrement (void);
     void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double r, double phi, double L, int ni);
     void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double L, int ni);
 
-    InterpolationType interpType;
-    const RAYSUM* rs;
+    const Projections& proj;
     ImageFile& im;
+    Backprojector::InterpolationID interpType;
     ImageFileArray v;
-    kuint32 nx;
-    kuint32 ny;
-    double det_inc;
-    double rot_inc;
-    int ncent;      	// index refering to L=0 projection 
-    int ndet;
-    double xmin, xmax, ymin, ymax;     // Retangular coords of phantom
-    double xinc, yinc;	// size of cells
+    kint32 nx;
+    kint32 ny;
+    double detInc;
+    double rotInc;
+    int iDetCenter;      	// index refering to L=0 projection 
+    int nDet;
+    double xMin, xMax, yMin, yMax;     // Retangular coords of phantom
+    double xInc, yInc;	// size of cells
+    int m_interpFactor;
 
  private:
     Backproject (const Backproject& rhs);
@@ -65,8 +132,8 @@ class Backproject
 class BackprojectTrig : public Backproject
 {
  public:
-  BackprojectTrig (const RAYSUM* rs, ImageFile& im, InterpolationType interpType)
-      : Backproject::Backproject (rs, im, interpType)
+  BackprojectTrig (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor)
+      : Backproject::Backproject (proj, im, interpType, interpFactor)
       {}
 
   void BackprojectView (const double* const t, double view_angle);
@@ -76,7 +143,7 @@ class BackprojectTrig : public Backproject
 class BackprojectTable : public Backproject
 {
  public:
-  BackprojectTable (const RAYSUM* rs, ImageFile& im, InterpolationType interpType);
+  BackprojectTable (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor);
   ~BackprojectTable ();
 
   void BackprojectView (const double* const t, double view_angle);
@@ -92,7 +159,7 @@ class BackprojectTable : public Backproject
 class BackprojectDiff : public Backproject
 {
  public:
-  BackprojectDiff (const RAYSUM* rs, ImageFile& im, InterpolationType interpType);
+  BackprojectDiff (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor);
   ~BackprojectDiff ();
 
   void BackprojectView (const double* const t, double view_angle);
@@ -106,8 +173,8 @@ class BackprojectDiff : public Backproject
 class BackprojectDiff2 : public BackprojectDiff
 {
  public:
-  BackprojectDiff2 (const RAYSUM* rs, ImageFile& im, InterpolationType interpType)
-    :  BackprojectDiff::BackprojectDiff (rs, im, interpType)
+  BackprojectDiff2 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor)
+    :  BackprojectDiff::BackprojectDiff (proj, im, interpType, interpFactor)
     {}
 
   void BackprojectView (const double* const t, double view_angle);
@@ -116,12 +183,22 @@ class BackprojectDiff2 : public BackprojectDiff
 class BackprojectIntDiff2 : public BackprojectDiff
 {
  public:
-  BackprojectIntDiff2 (const RAYSUM* rs, ImageFile& im, InterpolationType interpType)
-    :  BackprojectDiff::BackprojectDiff (rs, im, interpType)
+  BackprojectIntDiff2 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor)
+    :  BackprojectDiff::BackprojectDiff (proj, im, interpType, interpFactor)
+    {}
+  
+  void BackprojectView (const double* const t, double view_angle);
+};
+
+
+class BackprojectIntDiff3 : public BackprojectDiff
+{
+ public:
+  BackprojectIntDiff3 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor)
+    :  BackprojectDiff::BackprojectDiff (proj, im, interpType, interpFactor)
     {}
   
   void BackprojectView (const double* const t, double view_angle);
 };
 
 
-Backproject* selectBackprojector (BackprojType type, const RAYSUM*, ImageFile& im, InterpolationType interpType);