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 1.4 2000/06/22 10:17:28 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 Backprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName);
59 ~Backprojector (void);
61 void BackprojectView (const double* const viewData, const double viewAngle);
63 bool fail(void) const {return m_fail;}
66 string m_nameBackproject;
67 string m_nameInterpolation;
68 BackprojectID m_idBackproject;
69 InterpolationID m_idInterpolation;
71 Backproject* m_pBackprojectImplem;
73 static const char BPROJ_TRIG_STR[]= "trig";
74 static const char BPROJ_TABLE_STR[]= "table";
75 static const char BPROJ_DIFF_STR[]= "diff";
76 static const char BPROJ_DIFF2_STR[]= "diff2";
77 static const char BPROJ_IDIFF2_STR[]= "idiff2";
79 static const char INTERP_NEAREST_STR[]= "nearest";
80 static const char INTERP_LINEAR_STR[]= "linear";
81 static const char INTERP_BSPLINE_STR[]= "bspline";
83 static const InterpolationID convertInterpolationNameToID (const char* const interpName);
84 static const char* convertInterpolationIDToName (const InterpolationID interpID);
85 static const BackprojectID convertBackprojectNameToID (const char* const bprojName);
86 static const char* convertBackprojectIDToName (const BackprojectID bprojID);
88 bool initBackprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName);
95 Backproject (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType);
97 virtual ~Backproject ();
99 virtual void BackprojectView (const double* const viewData, const double viewAngle) {};
102 void ScaleImageByRotIncrement (void);
103 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double r, double phi, double L, int ni);
104 void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double L, int ni);
106 Backprojector::InterpolationID interpType;
107 const Projections& proj;
114 int iDetCenter; // index refering to L=0 projection
116 double xMin, xMax, yMin, yMax; // Retangular coords of phantom
117 double xInc, yInc; // size of cells
120 Backproject (const Backproject& rhs);
121 Backproject& operator= (const Backproject& rhs);
125 class BackprojectTrig : public Backproject
128 BackprojectTrig (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType)
129 : Backproject::Backproject (proj, im, interpType)
132 void BackprojectView (const double* const t, double view_angle);
136 class BackprojectTable : public Backproject
139 BackprojectTable (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType);
140 ~BackprojectTable ();
142 void BackprojectView (const double* const t, double view_angle);
145 Array2d<kfloat64> arrayR;
146 Array2d<kfloat64> arrayPhi;
152 class BackprojectDiff : public Backproject
155 BackprojectDiff (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType);
158 void BackprojectView (const double* const t, double view_angle);
163 double im_xinc, im_yinc;
166 class BackprojectDiff2 : public BackprojectDiff
169 BackprojectDiff2 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType)
170 : BackprojectDiff::BackprojectDiff (proj, im, interpType)
173 void BackprojectView (const double* const t, double view_angle);
176 class BackprojectIntDiff2 : public BackprojectDiff
179 BackprojectIntDiff2 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType)
180 : BackprojectDiff::BackprojectDiff (proj, im, interpType)
183 void BackprojectView (const double* const t, double view_angle);