X-Git-Url: http://git.kpe.io/?p=ctsim.git;a=blobdiff_plain;f=libctsim%2Fprocsignal.cpp;fp=libctsim%2Fprocsignal.cpp;h=155d8944f0c0ac67ae03a31bd1113c83c58eebc4;hp=b717f8037e104bebc5a453e4571249e5f81173e3;hb=efc79bd4b7deba9df501fccd39bc342f1329e6e6;hpb=ed576a069b0ba9de2e9153707012eba620ac606e

diff --git a/libctsim/procsignal.cpp b/libctsim/procsignal.cpp
index b717f80..155d894 100644
--- a/libctsim/procsignal.cpp
+++ b/libctsim/procsignal.cpp
@@ -9,7 +9,7 @@
 **  This is part of the CTSim program
 **  Copyright (C) 1983-2000 Kevin Rosenberg
 **
-**  $Id: procsignal.cpp,v 1.20 2001/01/12 21:53:27 kevin Exp $
+**  $Id: procsignal.cpp,v 1.21 2001/01/13 02:55:14 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
@@ -297,10 +297,9 @@ ProcessSignal::init (const int idFilter, const int idFilterMethod, double dBandw
       }
 #endif
 
-      // This doesn't work: Need to add filtering for divergent geometries & Frequency/Direct filtering
-      // Jan 2001: Direct seems to work for equilinear and equiangular
-      // however, inverse_fourier doesn't work for equiangular on all versions of CTSim tested
-      // Scaling is done with data in frequency space, natural order
+      // This works fairly well. I'm not sure why since scaling for geometries is done on
+      // frequency filter rather than spatial filter as it should be.
+      // It gives values slightly off than freq/inverse filtering
       if (m_idGeometry == Scanner::GEOMETRY_EQUILINEAR) {
         for (i = 0; i < m_nFilterPoints; i++)
           m_adFilter[i] *= 0.5;
@@ -365,8 +364,6 @@ ProcessSignal::init (const int idFilter, const int idFilterMethod, double dBandw
       }
 #endif
       
-#define PRE_JAN_2001 1
-#ifdef PRE_JAN_2001
       if (m_idGeometry == Scanner::GEOMETRY_EQUILINEAR) {
         for (i = 0; i < nSpatialPoints; i++)
           adSpatialFilter[i] *= 0.5;
@@ -408,68 +405,6 @@ ProcessSignal::init (const int idFilter, const int idFilterMethod, double dBandw
         dlgEZPlot.ShowModal();
       }
 #endif
-
-#else
-      for (i = nSpatialPoints; i < m_nFilterPoints; i++)
-        adSpatialFilter[i] = 0;
-           
-      std::complex<double>* acInverseFilter = new std::complex<double> [m_nFilterPoints];
-      finiteFourierTransform (adSpatialFilter, acInverseFilter, m_nFilterPoints, FORWARD);
-      delete adSpatialFilter;
-      m_adFilter = new double [m_nFilterPoints];
-      for (i = 0; i < m_nFilterPoints; i++)
-        m_adFilter[i] = std::abs(acInverseFilter[i]);
-      delete acInverseFilter;
-      
-#if defined(HAVE_WXWINDOWS) && (defined(DEBUG) || defined(_DEBUG))
-      if (g_bRunningWXWindows && m_traceLevel > 0) {
-        EZPlotDialog dlgEZPlot;
-        dlgEZPlot.getEZPlot()->ezset ("title Inverse Spatial Filter: Fourier order");
-        dlgEZPlot.getEZPlot()->addCurve (m_adFilter, m_nFilterPoints);
-        dlgEZPlot.ShowModal();
-      }
-#endif
-      Fourier::shuffleFourierToNaturalOrder(m_adFilter, m_nFilterPoints);
-#if defined(HAVE_WXWINDOWS) && (defined(DEBUG) || defined(_DEBUG))
-      if (g_bRunningWXWindows && m_traceLevel > 0) {
-        EZPlotDialog dlgEZPlot;
-        dlgEZPlot.getEZPlot()->ezset ("title Inverse Spatial Filter: Natural order");
-        dlgEZPlot.getEZPlot()->addCurve (m_adFilter, m_nFilterPoints);
-        dlgEZPlot.ShowModal();
-      }
-#endif
-      if (m_idGeometry == Scanner::GEOMETRY_EQUILINEAR) {
-        for (i = 0; i < m_nFilterPoints; i++)
-          m_adFilter[i] *= 0.5;
-      } else if (m_idGeometry == Scanner::GEOMETRY_EQUIANGULAR) {
-        for (i = 0; i < m_nFilterPoints; i++) {
-          int iDetFromZero = i - ((m_nFilterPoints - 1) / 2);
-          if (abs(iDetFromZero) < m_nSignalPoints) {
-            double sinScale = 1 / SignalFilter::sinc (iDetFromZero * m_dSignalInc);
-            double dScale = 0.5 * sinScale * sinScale;
-            m_adFilter[i] *= dScale;
-          }
-        }
-      }
-#if defined(HAVE_WXWINDOWS) && (defined(DEBUG) || defined(_DEBUG))
-      if (g_bRunningWXWindows && m_traceLevel > 0) {
-        EZPlotDialog dlgEZPlot;
-        dlgEZPlot.getEZPlot()->ezset ("title Scaled Inverse Spatial Filter: Natural order");
-        dlgEZPlot.getEZPlot()->addCurve (m_adFilter, m_nFilterPoints);
-        dlgEZPlot.ShowModal();
-      }
-#endif
-      Fourier::shuffleNaturalToFourierOrder(m_adFilter, m_nFilterPoints);
-#endif
-
-#if defined(HAVE_WXWINDOWS) && (defined(DEBUG) || defined(_DEBUG))
-      if (g_bRunningWXWindows && m_traceLevel > 0) {
-        EZPlotDialog dlgEZPlot;
-        dlgEZPlot.getEZPlot()->ezset ("title Spatial Filter Inverse Post Geometry Filtering");
-        dlgEZPlot.getEZPlot()->addCurve (m_adFilter, m_nFilterPoints);
-        dlgEZPlot.ShowModal();
-      }
-#endif
     }
   }