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 1.5 2000/06/25 17:32:24 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 #undef HAVE_BSPLINE_INTERP
47 INTERP_NEAREST, // Nearest neighbor
48 #if HAVE_BSPLINE_INTERP
50 I_1BSPLINE, // 1st order B-Spline
54 INTERP_LINEAR // Linear interpolation
57 static const char BPROJ_TRIG_STR[]= "trig";
58 static const char BPROJ_TABLE_STR[]= "table";
59 static const char BPROJ_DIFF_STR[]= "diff";
60 static const char BPROJ_DIFF2_STR[]= "diff2";
61 static const char BPROJ_IDIFF2_STR[]= "idiff2";
63 static const char INTERP_NEAREST_STR[]= "nearest";
64 static const char INTERP_LINEAR_STR[]= "linear";
65 static const char INTERP_BSPLINE_STR[]= "bspline";
68 Backprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName);
70 ~Backprojector (void);
72 void BackprojectView (const double* const viewData, const double viewAngle);
74 bool fail(void) const {return m_fail;}
75 const string& failMessage(void) const {return m_failMessage;}
78 string m_nameBackproject;
79 string m_nameInterpolation;
80 BackprojectID m_idBackproject;
81 InterpolationID m_idInterpolation;
82 Backproject* m_pBackprojectImplem;
86 static const InterpolationID convertInterpolationNameToID (const char* const interpName);
87 static const char* convertInterpolationIDToName (const InterpolationID interpID);
88 static const BackprojectID convertBackprojectNameToID (const char* const bprojName);
89 static const char* convertBackprojectIDToName (const BackprojectID bprojID);
91 bool initBackprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName);
98 Backproject (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType);
100 virtual ~Backproject ();
102 virtual void BackprojectView (const double* const viewData, const double viewAngle) {};
105 void ScaleImageByRotIncrement (void);
106 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double r, double phi, double L, int ni);
107 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double L, int ni);
109 Backprojector::InterpolationID interpType;
110 const Projections& proj;
117 int iDetCenter; // index refering to L=0 projection
119 double xMin, xMax, yMin, yMax; // Retangular coords of phantom
120 double xInc, yInc; // size of cells
123 Backproject (const Backproject& rhs);
124 Backproject& operator= (const Backproject& rhs);
128 class BackprojectTrig : public Backproject
131 BackprojectTrig (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType)
132 : Backproject::Backproject (proj, im, interpType)
135 void BackprojectView (const double* const t, double view_angle);
139 class BackprojectTable : public Backproject
142 BackprojectTable (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType);
143 ~BackprojectTable ();
145 void BackprojectView (const double* const t, double view_angle);
148 Array2d<kfloat64> arrayR;
149 Array2d<kfloat64> arrayPhi;
155 class BackprojectDiff : public Backproject
158 BackprojectDiff (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType);
161 void BackprojectView (const double* const t, double view_angle);
166 double im_xinc, im_yinc;
169 class BackprojectDiff2 : public BackprojectDiff
172 BackprojectDiff2 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType)
173 : BackprojectDiff::BackprojectDiff (proj, im, interpType)
176 void BackprojectView (const double* const t, double view_angle);
179 class BackprojectIntDiff2 : public BackprojectDiff
182 BackprojectIntDiff2 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType)
183 : BackprojectDiff::BackprojectDiff (proj, im, interpType)
186 void BackprojectView (const double* const t, double view_angle);