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 1.21 2001/02/11 04:56:37 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);
68 bool fail() const {return m_fail;}
69 const std::string& failMessage() const {return m_failMessage;}
71 static const int getBackprojectCount() {return s_iBackprojectCount;}
72 static const char** getBackprojectNameArray() {return s_aszBackprojectName;}
73 static const char** getBackprojectTitleArray() {return s_aszBackprojectTitle;}
74 static int convertBackprojectNameToID (const char* const bprojName);
75 static const char* convertBackprojectIDToName (const int bprojID);
76 static const char* convertBackprojectIDToTitle (const int bprojID);
78 static const int getInterpCount() {return s_iInterpCount;}
79 static const char** getInterpNameArray() {return s_aszInterpName;}
80 static const char** getInterpTitleArray() {return s_aszInterpTitle;}
81 static int convertInterpNameToID (const char* const interpName);
82 static const char* convertInterpIDToName (const int interpID);
83 static const char* convertInterpIDToTitle (const int interpID);
87 std::string m_nameBackproject;
88 std::string m_nameInterpolation;
90 int m_idInterpolation;
91 Backproject* m_pBackprojectImplem;
93 std::string m_failMessage;
95 static const char* s_aszBackprojectName[];
96 static const char* s_aszBackprojectTitle[];
97 static const int s_iBackprojectCount;
99 static const char* s_aszInterpName[];
100 static const char* s_aszInterpTitle[];
101 static const int s_iInterpCount;
103 bool initBackprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName, const int interpFactor);
110 Backproject (const Projections& proj, ImageFile& im, int interpID, const int interpFactor);
112 virtual ~Backproject ();
114 virtual void BackprojectView (const double* const viewData, const double viewAngle) {};
117 void ScaleImageByRotIncrement ();
118 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double r, double phi, double L, int ni);
119 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double L, int ni);
121 const Projections& proj;
129 int iDetCenter; // index refering to L=0 projection
131 double xMin, xMax, yMin, yMax; // Retangular coords of phantom
132 double xInc, yInc; // size of cells
134 double m_dFocalLength;
137 Backproject (const Backproject& rhs);
138 Backproject& operator= (const Backproject& rhs);
142 class BackprojectTrig : public Backproject
145 BackprojectTrig (const Projections& proj, ImageFile& im, int interpID, const int interpFactor)
146 : Backproject (proj, im, interpID, interpFactor)
149 void BackprojectView (const double* const t, const double view_angle);
153 class BackprojectTable : public Backproject
156 BackprojectTable (const Projections& proj, ImageFile& im, int interpID, const int interpFactor);
157 virtual ~BackprojectTable ();
159 void BackprojectView (const double* const t, const double view_angle);
162 Array2d<kfloat64> arrayR;
163 Array2d<kfloat64> arrayPhi;
169 class BackprojectDiff : public Backproject
172 BackprojectDiff (const Projections& proj, ImageFile& im, int interpID, const int interpFactor);
175 void BackprojectView (const double* const t, const double view_angle);
180 double im_xinc, im_yinc;
184 class BackprojectIntDiff : public BackprojectDiff
187 BackprojectIntDiff (const Projections& proj, ImageFile& im, int interpID, const int interpFactor)
188 : BackprojectDiff (proj, im, interpID, interpFactor)
191 void BackprojectView (const double* const t, const double view_angle);
194 class BackprojectEquilinear : public BackprojectTable
197 BackprojectEquilinear (const Projections& proj, ImageFile& im, int interpID, const int interpFactor)
198 : BackprojectTable (proj, im, interpID, interpFactor)
201 void BackprojectView (const double* const t, const double view_angle);
203 virtual ~BackprojectEquilinear()
207 class BackprojectEquiangular : public BackprojectTable
210 BackprojectEquiangular (const Projections& proj, ImageFile& im, int interpID, const int interpFactor)
211 : BackprojectTable (proj, im, interpID, interpFactor)
214 void BackprojectView (const double* const t, const double view_angle);
216 virtual ~BackprojectEquiangular()