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) 1983-2000 Kevin Rosenberg
12 ** $Id: backprojectors.h,v 1.11 2000/07/20 11:17:31 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"
54 INTERP_NEAREST, // Nearest neighbor
55 #if HAVE_BSPLINE_INTERP
57 I_1BSPLINE, // 1st order B-Spline
61 INTERP_LINEAR, // Linear interpolation
62 INTERP_FREQ_PREINTERPOLATION,
65 static const char BPROJ_TRIG_STR[];
66 static const char BPROJ_TABLE_STR[];
67 static const char BPROJ_DIFF_STR[];
68 static const char BPROJ_DIFF2_STR[];
69 static const char BPROJ_IDIFF2_STR[];
70 static const char BPROJ_IDIFF3_STR[];
72 static const char BPROJ_TRIG_TITLE_STR[];
73 static const char BPROJ_TABLE_TITLE_STR[];
74 static const char BPROJ_DIFF_TITLE_STR[];
75 static const char BPROJ_DIFF2_TITLE_STR[];
76 static const char BPROJ_IDIFF2_TITLE_STR[];
77 static const char BPROJ_IDIFF3_TITLE_STR[];
79 static const char INTERP_NEAREST_STR[];
80 static const char INTERP_LINEAR_STR[];
81 static const char INTERP_BSPLINE_STR[];
82 static const char INTERP_FREQ_PREINTERPOLATION_STR[];
84 static const char INTERP_NEAREST_TITLE_STR[];
85 static const char INTERP_LINEAR_TITLE_STR[];
86 static const char INTERP_BSPLINE_TITLE_STR[];
87 static const char INTERP_FREQ_PREINTERPOLATION_TITLE_STR[];
89 Backprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName, const int interpFactor);
91 ~Backprojector (void);
93 void BackprojectView (const double* const viewData, const double viewAngle);
95 bool fail(void) const {return m_fail;}
96 const string& failMessage(void) const {return m_failMessage;}
99 string m_nameBackproject;
100 string m_nameInterpolation;
101 BackprojectID m_idBackproject;
102 InterpolationID m_idInterpolation;
103 Backproject* m_pBackprojectImplem;
105 string m_failMessage;
107 static const InterpolationID convertInterpolationNameToID (const char* const interpName);
108 static const char* convertInterpolationIDToName (const InterpolationID interpID);
109 static const BackprojectID convertBackprojectNameToID (const char* const bprojName);
110 static const char* convertBackprojectIDToName (const BackprojectID bprojID);
112 bool initBackprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName, const int interpFactor);
119 Backproject (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor);
121 virtual ~Backproject ();
123 virtual void BackprojectView (const double* const viewData, const double viewAngle) {};
126 void ScaleImageByRotIncrement (void);
127 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double r, double phi, double L, int ni);
128 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double L, int ni);
130 const Projections& proj;
132 Backprojector::InterpolationID interpType;
138 int iDetCenter; // index refering to L=0 projection
140 double xMin, xMax, yMin, yMax; // Retangular coords of phantom
141 double xInc, yInc; // size of cells
145 Backproject (const Backproject& rhs);
146 Backproject& operator= (const Backproject& rhs);
150 class BackprojectTrig : public Backproject
153 BackprojectTrig (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor)
154 : Backproject::Backproject (proj, im, interpType, interpFactor)
157 void BackprojectView (const double* const t, double view_angle);
161 class BackprojectTable : public Backproject
164 BackprojectTable (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor);
165 ~BackprojectTable ();
167 void BackprojectView (const double* const t, double view_angle);
170 Array2d<kfloat64> arrayR;
171 Array2d<kfloat64> arrayPhi;
177 class BackprojectDiff : public Backproject
180 BackprojectDiff (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor);
183 void BackprojectView (const double* const t, double view_angle);
188 double im_xinc, im_yinc;
191 class BackprojectDiff2 : public BackprojectDiff
194 BackprojectDiff2 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor)
195 : BackprojectDiff::BackprojectDiff (proj, im, interpType, interpFactor)
198 void BackprojectView (const double* const t, double view_angle);
201 class BackprojectIntDiff2 : public BackprojectDiff
204 BackprojectIntDiff2 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor)
205 : BackprojectDiff::BackprojectDiff (proj, im, interpType, interpFactor)
208 void BackprojectView (const double* const t, double view_angle);
212 class BackprojectIntDiff3 : public BackprojectDiff
215 BackprojectIntDiff3 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType, const int interpFactor)
216 : BackprojectDiff::BackprojectDiff (proj, im, interpType, interpFactor)
219 void BackprojectView (const double* const t, double view_angle);