** This is part of the CTSim program
** Copyright (C) 1983-2000 Kevin Rosenberg
**
-** $Id: procsignal.cpp,v 1.12 2001/01/01 10:14:34 kevin Exp $
+** $Id: procsignal.cpp,v 1.18 2001/01/12 14:21:06 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
// 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)
-{\r
+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_idDomain = idDomain;
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;
pEZPlot->plot (pSGP);
}
#endif
- shuffleNaturalToFourierOrder (adFrequencyFilter, m_nFilterPoints);
+ Fourier::shuffleNaturalToFourierOrder (adFrequencyFilter, m_nFilterPoints);
#ifdef HAVE_SGP
if (pEZPlot && m_traceLevel >= Trace::TRACE_PLOT) {
pEZPlot->ezset ("title Filter Response: Fourier Order");
}
#endif
ProcessSignal::finiteFourierTransform (adFrequencyFilter, m_adFilter, m_nFilterPoints, FORWARD);
- delete adFrequencyFilter;\r
+ delete adFrequencyFilter;
#ifdef HAVE_SGP
if (pEZPlot && m_traceLevel >= Trace::TRACE_PLOT) {
pEZPlot->ezset ("title Inverse Fourier Frequency: Fourier Order");
pEZPlot->plot (pSGP);
}
#endif
- shuffleFourierToNaturalOrder (m_adFilter, m_nFilterPoints);
+ Fourier::shuffleFourierToNaturalOrder (m_adFilter, m_nFilterPoints);
#ifdef HAVE_SGP
if (pEZPlot && m_traceLevel >= Trace::TRACE_PLOT) {
pEZPlot->ezset ("title Inverse Fourier Frequency: Natural Order");
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;
pEZPlot->plot (pSGP);
}
#endif
- shuffleNaturalToFourierOrder (m_adFilter, m_nFilterPoints);
+ Fourier::shuffleNaturalToFourierOrder (m_adFilter, m_nFilterPoints);
#ifdef HAVE_SGP
if (pEZPlot && m_traceLevel >= Trace::TRACE_PLOT) {
pEZPlot->ezset ("title Filter Filter: Fourier Order");
if (m_traceLevel >= Trace::TRACE_CONSOLE)
std::cout << "nFilterPoints = " << m_nFilterPoints << endl;
#endif
- double* adSpatialFilter = new double [m_nFilterPoints];\r
- SignalFilter filter (m_idFilter, m_dFilterMin, m_dFilterMax, nSpatialPoints, m_dBandwidth, m_dFilterParam, SignalFilter::DOMAIN_SPATIAL);
+ double* adSpatialFilter = new double [m_nFilterPoints];
+ 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;
delete pEZPlot;
}
#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;
double dScale = 0.5 * sinScale * sinScale;
adSpatialFilter[i] *= dScale;
}
- }\r
+ }
for (i = nSpatialPoints; i < m_nFilterPoints; i++)
adSpatialFilter[i] = 0;
m_adFilter = new double [m_nFilterPoints];
- std::complex<double>* acInverseFilter = new std::complex<double> [m_nFilterPoints];\r
+ std::complex<double>* acInverseFilter = new std::complex<double> [m_nFilterPoints];
finiteFourierTransform (adSpatialFilter, acInverseFilter, m_nFilterPoints, BACKWARD);
- delete adSpatialFilter;\r
+ delete adSpatialFilter;
for (i = 0; i < m_nFilterPoints; i++)
m_adFilter[i] = std::abs (acInverseFilter[i]) * m_dSignalInc;
- delete acInverseFilter;\r
+ delete acInverseFilter;
+#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
+
#ifdef HAVE_SGP
if (pEZPlot && m_traceLevel >= Trace::TRACE_PLOT) {
pEZPlot->ezset ("title Spatial Filter: Inverse");
pEZPlot->ezset ("yporigin 0.50");
pEZPlot->addCurve (m_adFilter, m_nFilterPoints);
pEZPlot->plot (pSGP);
- delete pEZPlot;\r
+ delete pEZPlot;
}
#endif
}
ProcessSignal::filterSignal (const float constInput[], double output[]) const
{
double* input = new double [m_nSignalPoints];
- int i;\r
+ int i;
for (i = 0; i < m_nSignalPoints; i++)
input[i] = constInput[i];
int iDetFromCenter = i - (m_nSignalPoints / 2);
input[i] *= m_dFocalLength * cos (iDetFromCenter * m_dSignalInc);
}
- }\r
+ }
if (m_idFilterMethod == FILTER_METHOD_CONVOLUTION) {
for (i = 0; i < m_nSignalPoints; i++)
output[i] = convolve (input, m_dSignalInc, i, m_nSignalPoints);
for (i = m_nSignalPoints; i < m_nFilterPoints; i++)
inputSignal[i] = 0; // zeropad
std::complex<double>* fftSignal = new std::complex<double> [m_nFilterPoints];
- finiteFourierTransform (inputSignal, fftSignal, m_nFilterPoints, FORWARD);\r
+ finiteFourierTransform (inputSignal, fftSignal, m_nFilterPoints, FORWARD);
delete inputSignal;
for (i = 0; i < m_nFilterPoints; i++)
fftSignal[i] *= m_adFilter[i];
double* inverseFourier = new double [m_nFilterPoints];
- finiteFourierTransform (fftSignal, inverseFourier, m_nFilterPoints, BACKWARD);\r
+ finiteFourierTransform (fftSignal, inverseFourier, m_nFilterPoints, BACKWARD);
delete fftSignal;
for (i = 0; i < m_nSignalPoints; i++)
- output[i] = inverseFourier[i];\r
+ output[i] = inverseFourier[i];
delete inverseFourier;
} else if (m_idFilterMethod == FILTER_METHOD_FOURIER_TABLE) {
double* inputSignal = new double [m_nFilterPoints];
for (i = m_nSignalPoints; i < m_nFilterPoints; i++)
inputSignal[i] = 0; // zeropad
std::complex<double>* fftSignal = new std::complex<double> [m_nFilterPoints];
- finiteFourierTransform (inputSignal, fftSignal, FORWARD);\r
+ finiteFourierTransform (inputSignal, fftSignal, FORWARD);
delete inputSignal;
for (i = 0; i < m_nFilterPoints; i++)
fftSignal[i] *= m_adFilter[i];
double* inverseFourier = new double [m_nFilterPoints];
- finiteFourierTransform (fftSignal, inverseFourier, BACKWARD);\r
+ finiteFourierTransform (fftSignal, inverseFourier, BACKWARD);
delete fftSignal;
for (i = 0; i < m_nSignalPoints; i++)
- output[i] = inverseFourier[i];\r
+ output[i] = inverseFourier[i];
delete inverseFourier;
}
#if HAVE_FFTW
fftw_real* fftOutput = new fftw_real [ m_nFilterPoints ];
rfftw_one (m_realPlanForward, m_adRealFftInput, fftOutput);
for (i = 0; i < m_nFilterPoints; i++)
- m_adRealFftSignal[i] = m_adFilter[i] * fftOutput[i];\r
+ m_adRealFftSignal[i] = m_adFilter[i] * fftOutput[i];
delete [] fftOutput;
for (i = m_nFilterPoints; i < m_nOutputPoints; i++)
m_adRealFftSignal[i] = 0;
fftw_real* ifftOutput = new fftw_real [ m_nOutputPoints ];
rfftw_one (m_realPlanBackward, m_adRealFftSignal, ifftOutput);
for (i = 0; i < m_nSignalPoints * m_iPreinterpolationFactor; i++)
- output[i] = ifftOutput[i];\r
+ output[i] = ifftOutput[i];
delete [] ifftOutput;
} else if (m_idFilterMethod == FILTER_METHOD_FFTW) {
for (i = 0; i < m_nSignalPoints; i++)
for (i = 0; i < m_nFilterPoints; i++) {
m_adComplexFftSignal[i].re = m_adFilter[i] * fftOutput[i].re;
m_adComplexFftSignal[i].im = m_adFilter[i] * fftOutput[i].im;
- }\r
+ }
delete [] fftOutput;
fftw_complex* ifftOutput = new fftw_complex [ m_nOutputPoints ];
fftw_one (m_complexPlanBackward, m_adComplexFftSignal, ifftOutput);
for (i = 0; i < m_nSignalPoints * m_iPreinterpolationFactor; i++)
- output[i] = ifftOutput[i].re;\r
+ output[i] = ifftOutput[i].re;
delete [] ifftOutput;
}
-#endif\r
+#endif
delete input;
}
finiteFourierTransform (input, complexOutput, n, direction);
for (int i = 0; i < n; i++)
- output[i] = complexOutput[i].real();\r
+ output[i] = complexOutput[i].real();
delete [] complexOutput;
}
std::complex<double> sum (0,0);
for (int j = 0; j < n; j++) {
double angle = i * j * angleIncrement;
- std::complex<double> exponentTerm (cos(angle), sin(angle));\r
- sum += input[j] * exponentTerm;\r
+ std::complex<double> exponentTerm (cos(angle), sin(angle));
+ sum += input[j] * exponentTerm;
}
if (direction < 0) {
sum /= n;
}
}
-// Odd Number of Points
-// Natural Frequency Order: -(n-1)/2...-1,0,1...(n-1)/2
-// Fourier Frequency Order: 0, 1..(n-1)/2,-(n-1)/2...-1
-// Even Number of Points
-// Natural Frequency Order: -n/2...-1,0,1...((n/2)-1)
-// Fourier Frequency Order: 0,1...((n/2)-1),-n/2...-1
-
-void\r
-ProcessSignal::shuffleNaturalToFourierOrder (double* pdVector, const int n)\r
-{\r
- double* pdTemp = new double [n];\r
- int i;\r
- if (n % 2) { // Odd\r
- int iHalfN = (n - 1) / 2;\r
- \r
- pdTemp[0] = pdVector[iHalfN];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + 1] = pdVector[i + 1 + iHalfN];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + iHalfN + 1] = pdVector[i];\r
- } else { // Even\r
- int iHalfN = n / 2;\r
- pdTemp[0] = pdVector[iHalfN];\r
-#if USE_BROKEN_SHUFFLE\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + 1] = pdVector[i + iHalfN];\r
- for (i = 0; i < iHalfN - 1; i++)\r
- pdTemp[i + iHalfN + 1] = pdVector[i];\r
-#else\r
- for (i = 0; i < iHalfN - 1; i++)\r
- pdTemp[i + 1] = pdVector[i + iHalfN + 1];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + iHalfN] = pdVector[i];\r
-#endif\r
- }\r
- \r
- for (i = 0; i < n; i++)\r
- pdVector[i] = pdTemp[i];\r
- delete pdTemp;\r
-}\r
-\r
-void\r
-ProcessSignal::shuffleNaturalToFourierOrder (std::complex<double>* pdVector, const int n)\r
-{\r
- std::complex<double>* pdTemp = new std::complex<double> [n];\r
- int i;\r
- if (n % 2) { // Odd\r
- int iHalfN = (n - 1) / 2;\r
- \r
- pdTemp[0] = pdVector[iHalfN];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + 1] = pdVector[i + 1 + iHalfN];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + iHalfN + 1] = pdVector[i];\r
- } else { // Even\r
- int iHalfN = n / 2;\r
- pdTemp[0] = pdVector[iHalfN];\r
-#if USE_BROKEN_SHUFFLE\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + 1] = pdVector[i + iHalfN];\r
- for (i = 0; i < iHalfN - 1; i++)\r
- pdTemp[i + iHalfN + 1] = pdVector[i];\r
-#else\r
- for (i = 0; i < iHalfN - 1; i++)\r
- pdTemp[i + 1] = pdVector[i + iHalfN + 1];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + iHalfN] = pdVector[i];\r
-#endif\r
- }\r
- \r
- for (i = 0; i < n; i++)\r
- pdVector[i] = pdTemp[i];\r
- delete [] pdTemp;\r
-}\r
-\r
-\r
-void\r
-ProcessSignal::shuffleNaturalToFourierOrder (float* pdVector, const int n)\r
-{\r
- float* pdTemp = new float [n];\r
- int i;\r
- if (n % 2) { // Odd\r
- int iHalfN = (n - 1) / 2;\r
- \r
- pdTemp[0] = pdVector[iHalfN];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + 1] = pdVector[i + 1 + iHalfN];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + iHalfN + 1] = pdVector[i];\r
- } else { // Even\r
- int iHalfN = n / 2;\r
- pdTemp[0] = pdVector[iHalfN];\r
-#if USE_BROKEN_SHUFFLE\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + 1] = pdVector[i + iHalfN];\r
- for (i = 0; i < iHalfN - 1; i++)\r
- pdTemp[i + iHalfN + 1] = pdVector[i];\r
-#else\r
- for (i = 0; i < iHalfN - 1; i++)\r
- pdTemp[i + 1] = pdVector[i + iHalfN + 1];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + iHalfN] = pdVector[i];\r
-#endif\r
- }\r
- \r
- for (i = 0; i < n; i++)\r
- pdVector[i] = pdTemp[i];\r
- delete pdTemp;\r
-}\r
-\r
-\r
-\r
-void\r
-ProcessSignal::shuffleFourierToNaturalOrder (double* pdVector, const int n)\r
-{\r
- double* pdTemp = new double [n];\r
- int i;\r
- if (n % 2) { // Odd\r
- int iHalfN = (n - 1) / 2;\r
- \r
- pdTemp[iHalfN] = pdVector[0];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + 1 + iHalfN] = pdVector[i + 1];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i] = pdVector[i + iHalfN + 1];\r
- } else { // Even\r
- int iHalfN = n / 2;\r
- pdTemp[iHalfN] = pdVector[0];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i] = pdVector[i + iHalfN];\r
- for (i = 0; i < iHalfN - 1; i++)\r
- pdTemp[i + iHalfN + 1] = pdVector[i+1];\r
- }\r
- \r
- for (i = 0; i < n; i++)\r
- pdVector[i] = pdTemp[i];\r
- delete pdTemp;\r
-}\r
-\r
-\r
-void\r
-ProcessSignal::shuffleFourierToNaturalOrder (std::complex<double>* pdVector, const int n)\r
-{\r
- std::complex<double>* pdTemp = new std::complex<double> [n];\r
- int i;\r
- if (n % 2) { // Odd\r
- int iHalfN = (n - 1) / 2;\r
- \r
- pdTemp[iHalfN] = pdVector[0];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i + 1 + iHalfN] = pdVector[i + 1];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i] = pdVector[i + iHalfN + 1];\r
- } else { // Even\r
- int iHalfN = n / 2;\r
- pdTemp[iHalfN] = pdVector[0];\r
- for (i = 0; i < iHalfN; i++)\r
- pdTemp[i] = pdVector[i + iHalfN];\r
- for (i = 0; i < iHalfN - 1; i++)\r
- pdTemp[i + iHalfN + 1] = pdVector[i+1];\r
- }\r
- \r
- for (i = 0; i < n; i++)\r
- pdVector[i] = pdTemp[i];\r
- delete [] pdTemp;\r
-}\r
-\r
-\r
-\r
-\r
-void\r
-ProcessSignal::shuffleFourierToNaturalOrder (float* pVector, const int n)\r
-{\r
- float* pTemp = new float [n];\r
- int i;\r
- if (n % 2) { // Odd\r
- int iHalfN = (n - 1) / 2;\r
- \r
- pTemp[iHalfN] = pVector[0];\r
- for (i = 0; i < iHalfN; i++)\r
- pTemp[i + 1 + iHalfN] = pVector[i + 1];\r
- for (i = 0; i < iHalfN; i++)\r
- pTemp[i] = pVector[i + iHalfN + 1];\r
- } else { // Even\r
- int iHalfN = n / 2;\r
- pTemp[iHalfN] = pVector[0];\r
- for (i = 0; i < iHalfN; i++)\r
- pTemp[i] = pVector[i + iHalfN];\r
- for (i = 0; i < iHalfN - 1; i++)\r
- pTemp[i + iHalfN + 1] = pVector[i+1];\r
- }\r
- \r
- for (i = 0; i < n; i++)\r
- pVector[i] = pTemp[i];\r
- delete [] pTemp;\r
-}\r
-\r
projects / ctsim.git / blobdiff