r382: no message

[ctsim.git] / libctsim / procsignal.cpp

diff --git a/libctsim/procsignal.cpp b/libctsim/procsignal.cpp
index 86501abc043b5571d8f87b81afd8aeb52aa7bd59..4fdefe6679e9fd16346259c8566ce8ebea0f510d 100644 (file)
--- 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 1.16 2001/01/12 04:28:37 kevin Exp $
+**  $Id: procsignal.cpp,v 1.17 2001/01/12 14:14:58 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
@@ -364,6 +364,8 @@ 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 < m_nFilterPoints; i++)
           adSpatialFilter[i] *= 0.5;
@@ -384,19 +386,38 @@ ProcessSignal::init (const int idFilter, const int idFilterMethod, double dBandw
       
       m_adFilter = new double [m_nFilterPoints];
       std::complex<double>* acInverseFilter = new std::complex<double> [m_nFilterPoints];
-#define PRE_JAN_2001 1
-#ifdef PRE_JAN_2001
       finiteFourierTransform (adSpatialFilter, acInverseFilter, m_nFilterPoints, BACKWARD);
       delete adSpatialFilter;
       for (i = 0; i < m_nFilterPoints; i++)
         m_adFilter[i] = std::abs (acInverseFilter[i]) * m_dSignalInc;
       delete acInverseFilter;
 #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 (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);
+          double sinScale = sin (iDetFromZero * m_dSignalInc);
+          if (fabs(sinScale) < 1E-7)
+            sinScale = 1;
+          else
+            sinScale = (iDetFromZero * m_dSignalInc) / sinScale;
+          double dScale = 0.5 * sinScale * sinScale;
+          m_adFilter[i] *= dScale;
+        }
+      }
 #endif
 
 #ifdef HAVE_SGP