X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=include%2Fbackprojectors.h;h=f0cc19a1d0147ce6da2dab7169f44735418cc2df;hb=6850134e4711a842cc7c0a306a9e4243df06b952;hp=6b8b9c4635b76c183161167f14ec2f60e3f2b9b9;hpb=08f34bf3ba14d4f436f4d2ef0ee5af1d6eb266ac;p=ctsim.git

diff --git a/include/backprojectors.h b/include/backprojectors.h
index 6b8b9c4..f0cc19a 100644
--- a/include/backprojectors.h
+++ b/include/backprojectors.h
@@ -9,7 +9,7 @@
 **  This is part of the CTSim program
 **  Copyright (C) 1983-2000 Kevin Rosenberg
 **
-**  $Id: backprojectors.h,v 1.5 2000/06/25 17:32:24 kevin Exp $
+**  $Id: backprojectors.h,v 1.7 2000/07/09 08:16:17 kevin Exp $
 **
 **  This program is free software; you can redistribute it and/or modify
 **  it under the terms of the GNU General Public License (version 2) as
@@ -39,7 +39,8 @@ class Backprojector
     BPROJ_TABLE,
     BPROJ_DIFF,
     BPROJ_DIFF2,
-    BPROJ_IDIFF2
+    BPROJ_IDIFF2,
+    BPROJ_IDIFF3
 } BackprojectID;
 
   typedef enum {
@@ -51,7 +52,8 @@ class Backprojector
     I_2BSPLINE,
     I_3BSPLINE,
 #endif
-    INTERP_LINEAR        // Linear interpolation 
+    INTERP_LINEAR,        // Linear interpolation 
+    INTERP_FREQ_PREINTERPOLATE,
   } InterpolationID;
 
   static const char BPROJ_TRIG_STR[]=     "trig";
@@ -59,11 +61,12 @@ class Backprojector
   static const char BPROJ_DIFF_STR[]=     "diff";
   static const char BPROJ_DIFF2_STR[]=    "diff2";
   static const char BPROJ_IDIFF2_STR[]=   "idiff2";
+  static const char BPROJ_IDIFF3_STR[]=   "idiff3";
  
   static const char INTERP_NEAREST_STR[]=  "nearest";
   static const char INTERP_LINEAR_STR[]=   "linear";
   static const char INTERP_BSPLINE_STR[]=  "bspline";
-
+  static const char INTERP_FREQ_PREINTERPOLATE_STR[]= "freq_preinterpolate";
 
   Backprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName);
 
@@ -187,3 +190,14 @@ class BackprojectIntDiff2 : public BackprojectDiff
 };
 
 
+class BackprojectIntDiff3 : public BackprojectDiff
+{
+ public:
+  BackprojectIntDiff3 (const Projections& proj, ImageFile& im, Backprojector::InterpolationID interpType)
+    :  BackprojectDiff::BackprojectDiff (proj, im, interpType)
+    {}
+  
+  void BackprojectView (const double* const t, double view_angle);
+};
+
+