1 /*****************************************************************************
5 ** Purpose: Signal filter header file
6 ** Programmer: Kevin Rosenberg
7 ** Date Started: June 2000
9 ** This is part of the CTSim program
10 ** Copyright (c) 1983-2001 Kevin Rosenberg
12 ** $Id: procsignal.h,v 1.16 2001/03/13 14:53:43 kevin Exp $
14 ** This program is free software; you can redistribute it and/or modify
15 ** it under the terms of the GNU General Public License (version 2) as
16 ** published by the Free Software Foundation.
18 ** This program is distributed in the hope that it will be useful,
19 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ** GNU General Public License for more details.
23 ** You should have received a copy of the GNU General Public License
24 ** along with this program; if not, write to the Free Software
25 ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 ******************************************************************************/
45 typedef std::complex<double> CTSimComplex;
50 static const int FILTER_METHOD_INVALID;
51 static const int FILTER_METHOD_CONVOLUTION;
52 static const int FILTER_METHOD_FOURIER;
53 static const int FILTER_METHOD_FOURIER_TABLE;
54 static const int FILTER_METHOD_FFT;
56 static const int FILTER_METHOD_FFTW;
57 static const int FILTER_METHOD_RFFTW;
60 static const int FILTER_GENERATION_INVALID;
61 static const int FILTER_GENERATION_DIRECT;
62 static const int FILTER_GENERATION_INVERSE_FOURIER;
69 ProcessSignal (const char* szFilterName, const char* szFilterMethodName,double bw, double signalIncrement,
70 int n, double param, const char* szDomainName, const char* szFilterGenerationName,
71 const int zeropad, const int preinterpolationFactor, const int iTraceLevel, int iGeometry,
72 double dFocalLength, double dSourceDetectorLength, SGP* pSGP = NULL);
76 void filterSignal (const float input[], double output[]) const;
78 bool fail(void) const {return m_fail;}
79 const std::string& failMessage(void) const {return m_failMessage;}
81 void setTraceLevel (int traceLevel) {m_traceLevel = traceLevel; }
83 int getNFilterPoints (void) const { return m_nFilterPoints; }
84 const double getFilterMin(void) const {return m_dFilterMin;}
85 const double getFilterMax(void) const {return m_dFilterMax;}
86 const double getFilterIncrement(void) const {return m_dFilterInc;}
87 double* getFilter(void) {return m_adFilter;}
88 const double* getFilter(void) const {return m_adFilter;}
90 const int idFilterGeneration() const { return m_idFilterGeneration;}
92 static const int getFilterGenerationCount() {return s_iFilterGenerationCount;}
93 static const char* const* getFilterGenerationNameArray() {return s_aszFilterGenerationName;}
94 static const char* const* getFilterGenerationTitleArray() {return s_aszFilterGenerationTitle;}
95 static int convertFilterGenerationNameToID (const char* const fgName);
96 static const char* convertFilterGenerationIDToName (const int idFG);
97 static const char* convertFilterGenerationIDToTitle (const int idFG);
99 static const int getFilterMethodCount() {return s_iFilterMethodCount;}
100 static const char* const* getFilterMethodNameArray() {return s_aszFilterMethodName;}
101 static const char* const* getFilterMethodTitleArray() {return s_aszFilterMethodTitle;}
102 static int convertFilterMethodNameToID (const char* const filterMethodName);
103 static const char* convertFilterMethodIDToName (const int idFilterMethod);
104 static const char* convertFilterMethodIDToTitle (const int idFilterMethod);
106 // transforms using direct trigometric calculation
107 static void finiteFourierTransform (const double input[], double output[], const int n, const int direction);
108 static void finiteFourierTransform (const double input[], std::complex<double> output[], const int n, const int direction);
109 static void finiteFourierTransform (const std::complex<double> input[], std::complex<double> output[], const int n, const int direction);
110 static void finiteFourierTransform (const std::complex<double> input[], double output[], const int n, const int direction);
112 static int addZeropadFactor (int n, int iZeropad);
115 std::string m_nameFilterMethod;
116 std::string m_nameFilterGeneration;
117 int m_idFilterMethod;
118 int m_idFilterGeneration;
120 double* m_adFourierCosTable;
121 double* m_adFourierSinTable;
128 bool m_bFrequencyFiltering;
130 // Variables also kept in SignalFilter class
136 double m_dFilterParam;
139 int m_iPreinterpolationFactor;
141 double m_dFocalLength;
142 double m_dSourceDetectorLength;
145 std::string m_failMessage;
147 static const char* const s_aszFilterMethodName[];
148 static const char* const s_aszFilterMethodTitle[];
149 static const int s_iFilterMethodCount;
150 static const char* const s_aszFilterGenerationName[];
151 static const char* const s_aszFilterGenerationTitle[];
152 static const int s_iFilterGenerationCount;
155 fftw_real* m_adRealFftInput, *m_adRealFftSignal;
156 rfftw_plan m_realPlanForward, m_realPlanBackward;
157 fftw_complex* m_adComplexFftInput, *m_adComplexFftSignal;
158 fftw_plan m_complexPlanForward, m_complexPlanBackward;
161 void init (const int idFilter, int idFilterMethod, double dBandwidth, double dSignalIncrement,
162 int nSignalPoints, double dFilterParam, const int idDomain, int idFilterGeneration, const int iZeropad,
163 const int iPreinterpolationFactor, const int iTraceLevel, const int iGeometry, double dFocalLength,
164 double dSourceDetectorLength, SGP* pSGP);
166 // transforms that use precalculated trig tables, therefore don't
167 // require number of data points (n) as an argument
168 void finiteFourierTransform (const double input[], std::complex<double> output[], const int direction) const;
169 void finiteFourierTransform (const std::complex<double> input[], std::complex<double> output[], const int direction) const;
170 void finiteFourierTransform (const std::complex<double> input[], double output[], const int direction) const;
172 double convolve (const double func[], const double filter[], const double dx, const int n, const int np) const;
173 double convolve (const double f[], const double dx, const int n, const int np) const;
174 double convolve (const float f[], const double dx, const int n, const int np) const;