1 /*****************************************************************************
5 ** Purpose: Backprojection classes
6 ** Programmer: Kevin Rosenberg
7 ** Date Started: June 2000
9 ** This is part of the CTSim program
10 ** Copyright (c) 1983-2001 Kevin Rosenberg
12 ** $Id: backprojectors.h,v 1.23 2001/02/23 02:06:01 kevin Exp $
14 ** This program is free software; you can redistribute it and/or modify
15 ** it under the terms of the GNU General Public License (version 2) as
16 ** published by the Free Software Foundation.
18 ** This program is distributed in the hope that it will be useful,
19 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ** GNU General Public License for more details.
23 ** You should have received a copy of the GNU General Public License
24 ** along with this program; if not, write to the Free Software
25 ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 ******************************************************************************/
29 #ifndef __BACKPROJECTORS_H
30 #define __BACKPROJECTORS_H
32 #undef HAVE_BSPLINE_INTERP
34 #include "imagefile.h"
44 static const int BPROJ_INVALID;
45 static const int BPROJ_TRIG;
46 static const int BPROJ_TABLE;
47 static const int BPROJ_DIFF;
48 static const int BPROJ_IDIFF;
50 static const int INTERP_INVALID;
51 static const int INTERP_NEAREST;
52 static const int INTERP_LINEAR;
53 static const int INTERP_CUBIC;
54 static const int INTERP_FREQ_PREINTERPOLATION;
55 #if HAVE_BSPLINE_INTERP
56 static const int INTERP_BSPLINE;
57 static const int INTERP_1BSPLINE;
58 static const int INTERP_2BSPLINE;
59 static const int INTERP_3BSPLINE;
62 Backprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName, const int interpFactor);
66 void BackprojectView (const double* const viewData, const double viewAngle);
67 void PostProcessing();
69 bool fail() const {return m_fail;}
70 const std::string& failMessage() const {return m_failMessage;}
72 static const int getBackprojectCount() {return s_iBackprojectCount;}
73 static const char* const* getBackprojectNameArray() {return s_aszBackprojectName;}
74 static const char* const* getBackprojectTitleArray() {return s_aszBackprojectTitle;}
75 static int convertBackprojectNameToID (const char* const bprojName);
76 static const char* convertBackprojectIDToName (const int bprojID);
77 static const char* convertBackprojectIDToTitle (const int bprojID);
79 static const int getInterpCount() {return s_iInterpCount;}
80 static const char* const * getInterpNameArray() {return s_aszInterpName;}
81 static const char* const * getInterpTitleArray() {return s_aszInterpTitle;}
82 static int convertInterpNameToID (const char* const interpName);
83 static const char* convertInterpIDToName (const int interpID);
84 static const char* convertInterpIDToTitle (const int interpID);
88 std::string m_nameBackproject;
89 std::string m_nameInterpolation;
91 int m_idInterpolation;
92 Backproject* m_pBackprojectImplem;
94 std::string m_failMessage;
96 static const char* const s_aszBackprojectName[];
97 static const char* const s_aszBackprojectTitle[];
98 static const int s_iBackprojectCount;
100 static const char* const s_aszInterpName[];
101 static const char* const s_aszInterpTitle[];
102 static const int s_iInterpCount;
104 bool initBackprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName, const int interpFactor);
111 Backproject (const Projections& proj, ImageFile& im, int interpID, const int interpFactor);
113 virtual ~Backproject ();
115 virtual void BackprojectView (const double* const viewData, const double viewAngle) = 0;
116 virtual void PostProcessing (); // call after backprojecting all views
119 void ScaleImageByRotIncrement ();
120 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double r, double phi, double L, int ni);
121 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double L, int ni);
122 const Projections& proj;
130 int iDetCenter; // index refering to L=0 projection
132 double xMin, xMax, yMin, yMax; // Retangular coords of phantom
133 double xInc, yInc; // size of cells
135 double m_dFocalLength;
136 bool m_bPostProcessingDone;
139 Backproject (const Backproject& rhs);
140 Backproject& operator= (const Backproject& rhs);
144 class BackprojectTrig : public Backproject
147 BackprojectTrig (const Projections& proj, ImageFile& im, int interpID, const int interpFactor)
148 : Backproject (proj, im, interpID, interpFactor)
151 void BackprojectView (const double* const t, const double view_angle);
155 class BackprojectTable : public Backproject
158 BackprojectTable (const Projections& proj, ImageFile& im, int interpID, const int interpFactor);
159 virtual ~BackprojectTable ();
161 virtual void BackprojectView (const double* const t, const double view_angle);
162 virtual void PostProcessing (); // call after backprojecting all views
165 Array2d<kfloat64> arrayR;
166 Array2d<kfloat64> arrayPhi;
172 class BackprojectDiff : public Backproject
175 BackprojectDiff (const Projections& proj, ImageFile& im, int interpID, const int interpFactor);
178 virtual void BackprojectView (const double* const t, const double view_angle);
179 virtual void PostProcessing (); // call after backprojecting all views
184 double im_xinc, im_yinc;
188 class BackprojectIntDiff : public BackprojectDiff
191 BackprojectIntDiff (const Projections& proj, ImageFile& im, int interpID, const int interpFactor)
192 : BackprojectDiff (proj, im, interpID, interpFactor)
195 void BackprojectView (const double* const t, const double view_angle);
198 class BackprojectEquilinear : public BackprojectTable
201 BackprojectEquilinear (const Projections& proj, ImageFile& im, int interpID, const int interpFactor)
202 : BackprojectTable (proj, im, interpID, interpFactor)
205 void BackprojectView (const double* const t, const double view_angle);
207 virtual ~BackprojectEquilinear()
211 class BackprojectEquiangular : public BackprojectTable
214 BackprojectEquiangular (const Projections& proj, ImageFile& im, int interpID, const int interpFactor)
215 : BackprojectTable (proj, im, interpID, interpFactor)
218 void BackprojectView (const double* const t, const double view_angle);
220 virtual ~BackprojectEquiangular()