** This is part of the CTSim program
** Copyright (C) 1983-2000 Kevin Rosenberg
**
-** $Id: procsignal.cpp,v 1.14 2001/01/02 16:02:13 kevin Exp $
+** $Id: procsignal.cpp,v 1.19 2001/01/12 16:41:56 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
#include "ct.h"
+#ifdef HAVE_WXWINDOWS
+#include "../src/dlgezplot.h"
+#endif
+
// FilterMethod ID/Names
const int ProcessSignal::FILTER_METHOD_INVALID = -1;
const int ProcessSignal::FILTER_METHOD_CONVOLUTION = 0;
// CLASS IDENTIFICATION
// ProcessSignal
//
-ProcessSignal::ProcessSignal (const char* szFilterName, const char* szFilterMethodName, double dBandwidth, double dSignalIncrement, int nSignalPoints, double dFilterParam, const char* szDomainName, const char* szFilterGenerationName, int iZeropad, int iPreinterpolationFactor, int iTraceLevel, int iGeometry, double dFocalLength, SGP* pSGP)
+ProcessSignal::ProcessSignal (const char* szFilterName, const char* szFilterMethodName, double dBandwidth,
+ double dSignalIncrement, int nSignalPoints, double dFilterParam, const char* szDomainName,
+ const char* szFilterGenerationName, int iZeropad, int iPreinterpolationFactor, int iTraceLevel,
+ int iGeometry, double dFocalLength, SGP* pSGP)
: m_adFourierCosTable(NULL), m_adFourierSinTable(NULL), m_adFilter(NULL), m_fail(false)
{
m_idFilterMethod = convertFilterMethodNameToID (szFilterMethodName);
return;
}
- init (m_idFilter, m_idFilterMethod, dBandwidth, dSignalIncrement, nSignalPoints, dFilterParam, m_idDomain, m_idFilterGeneration, iZeropad, iPreinterpolationFactor, iTraceLevel, iGeometry, dFocalLength, pSGP);
+ init (m_idFilter, m_idFilterMethod, dBandwidth, dSignalIncrement, nSignalPoints, dFilterParam, m_idDomain,
+ m_idFilterGeneration, iZeropad, iPreinterpolationFactor, iTraceLevel, iGeometry, dFocalLength, pSGP);
}
void
-ProcessSignal::init (const int idFilter, const int idFilterMethod, double dBandwidth, double dSignalIncrement, int nSignalPoints, double dFilterParam, const int idDomain, const int idFilterGeneration, const int iZeropad, const int iPreinterpolationFactor, int iTraceLevel, int iGeometry, double dFocalLength, SGP* pSGP)
+ProcessSignal::init (const int idFilter, const int idFilterMethod, double dBandwidth, double dSignalIncrement,
+ int nSignalPoints, double dFilterParam, const int idDomain, const int idFilterGeneration,
+ const int iZeropad, const int iPreinterpolationFactor, int iTraceLevel, int iGeometry,
+ double dFocalLength, SGP* pSGP)
{
int i;
m_idFilter = idFilter;
m_iPreinterpolationFactor = iPreinterpolationFactor;
// scale signalInc/BW to signalInc/2 to adjust for imaginary detector
- // through origin of phantom, see Kak-Slaney Fig 3.22, for Collinear
+ // through origin of phantom rather than 2 times distance to detector,
+ // see Kak-Slaney Fig 3.22, for Collinear diagram
if (m_idGeometry == Scanner::GEOMETRY_EQUILINEAR) {
m_dSignalInc /= 2;
m_dBandwidth *= 2;
m_dFilterMax -= m_dFilterInc;
}
- SignalFilter filter (m_idFilter, m_dFilterMin, m_dFilterMax, m_nFilterPoints, m_dBandwidth, m_dFilterParam, SignalFilter::DOMAIN_FREQUENCY);
+ SignalFilter filter (m_idFilter, m_dFilterMin, m_dFilterMax, m_nFilterPoints, m_dBandwidth,
+ m_dFilterParam, SignalFilter::DOMAIN_FREQUENCY);
m_adFilter = new double [m_nFilterPoints];
filter.copyFilterData (m_adFilter, 0, m_nFilterPoints);
// 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
+
if (m_idGeometry == Scanner::GEOMETRY_EQUILINEAR) {
for (i = 0; i < m_nFilterPoints; i++)
m_adFilter[i] *= 0.5;
std::cout << "nFilterPoints = " << m_nFilterPoints << endl;
#endif
double* adSpatialFilter = new double [m_nFilterPoints];
- SignalFilter filter (m_idFilter, m_dFilterMin, m_dFilterMax, nSpatialPoints, m_dBandwidth, m_dFilterParam, SignalFilter::DOMAIN_SPATIAL);
+ SignalFilter filter (m_idFilter, m_dFilterMin, m_dFilterMax, nSpatialPoints, m_dBandwidth,
+ m_dFilterParam, SignalFilter::DOMAIN_SPATIAL);
filter.copyFilterData (adSpatialFilter, 0, nSpatialPoints);
-#ifdef HAVE_SGP
- EZPlot* pEZPlot = NULL;
- if (pSGP && m_traceLevel >= Trace::TRACE_PLOT) {
- pEZPlot = new EZPlot;
- pEZPlot->ezset ("title Spatial Filter: Natural Order");
- pEZPlot->ezset ("ylength 0.50");
- pEZPlot->ezset ("yporigin 0.00");
- pEZPlot->addCurve (adSpatialFilter, nSpatialPoints);
- pEZPlot->plot (pSGP);
- delete pEZPlot;
+#if defined(HAVE_WXWINDOWS) && defined(DEBUG)
+ EZPlotDialog pEZPlotDlg = NULL;
+ if (g_bRunningWXWindows && m_traceLevel > 0) {
+ pEZPlotDlg = new EZPlotDialog;
+ pEZPlot->getEZPlot()->ezset ("title Spatial Filter: Natural Order");
+ pEZPlot->getEZPlot()->ezset ("ylength 0.50");
+ pEZPlot->getEZPlot()->ezset ("yporigin 0.00");
+ pEZPlot->getEZPlot()->addCurve (adSpatialFilter, nSpatialPoints);
}
#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;
for (i = 0; i < m_nFilterPoints; i++)
m_adFilter[i] = std::abs (acInverseFilter[i]) * m_dSignalInc;
delete acInverseFilter;
-#ifdef HAVE_SGP
- if (pEZPlot && m_traceLevel >= Trace::TRACE_PLOT) {
- pEZPlot->ezset ("title Spatial Filter: Inverse");
- pEZPlot->ezset ("ylength 0.50");
- pEZPlot->ezset ("yporigin 0.50");
- pEZPlot->addCurve (m_adFilter, m_nFilterPoints);
- pEZPlot->plot (pSGP);
- delete pEZPlot;
+#else
+ for (i = nSpatialPoints; i < m_nFilterPoints; i++)
+ adSpatialFilter[i] = 0;
+
+// for (i = 0; i < m_nFilterPoints; i++)
+// adSpatialFilter[i] /= m_dSignalInc;
+
+ 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
+
+#if defined(HAVE_WXWINDOWS) && defined(DEBUG)
+ if (g_bRunningWXWindows && pEZPlotDlg && m_traceLevel > 0) {
+ pEZPlotDlg->getEZPlot()->ezset ("title Spatial Filter: Inverse");
+ pEZPlotDlg->getEZPlot()->ezset ("ylength 0.50");
+ pEZPlotDlg->getEZPlot()->ezset ("yporigin 0.50");
+ pEZPlotDlg->getEZPlot()->addCurve (m_adFilter, m_nFilterPoints);
+ pEZPlotDlg->ShowModal();
+ delete pEZPlotDlg;
}
#endif
}
projects / ctsim.git / blobdiff