+/*****************************************************************************
+** FILE IDENTIFICATION
+**
+** Name: filter.h
+** Purpose: Signal filter header file
+** Programmer: Kevin Rosenberg
+** Date Started: June 2000
+**
+** This is part of the CTSim program
+** Copyright (C) 1983-2000 Kevin Rosenberg
+**
+** $Id: filter.h,v 1.14 2000/07/19 04:33:27 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
+** published by the Free Software Foundation.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+** GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+******************************************************************************/
+
+#ifndef FILTER_H
+#define FILTER_H
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#ifdef HAVE_FFTW
+#include <fftw.h>
+#include <rfftw.h>
+#endif
+
+#include <complex>
+
+
class SignalFilter {
public:
- SignalFilter (const FilterType filt_type, double bw, double xmin, double xmax, int n, double param, const DomainType domain, const int numInt);
+ typedef enum {
+ FILTER_INVALID,
+ FILTER_BANDLIMIT,
+ FILTER_SINC,
+ FILTER_G_HAMMING,
+ FILTER_COSINE,
+ FILTER_TRIANGLE,
+ FILTER_ABS_BANDLIMIT, // filter times |x|
+ FILTER_ABS_SINC,
+ FILTER_ABS_G_HAMMING,
+ FILTER_ABS_COSINE,
+ FILTER_SHEPP
+ } FilterID;
+
+ typedef enum {
+ FILTER_METHOD_INVALID,
+ FILTER_METHOD_CONVOLUTION,
+ FILTER_METHOD_FOURIER,
+ FILTER_METHOD_FOURIER_TABLE,
+ FILTER_METHOD_FFT,
+#if HAVE_FFTW
+ FILTER_METHOD_FFTW,
+ FILTER_METHOD_RFFTW,
+#endif
+ } FilterMethodID;
+
+ typedef enum {
+ DOMAIN_INVALID,
+ DOMAIN_FREQUENCY,
+ DOMAIN_SPATIAL
+ } DomainID;
+
+ static const char FILTER_ABS_BANDLIMIT_STR[]= "abs_bandlimit";
+ static const char FILTER_ABS_SINC_STR[]= "abs_sinc";
+ static const char FILTER_ABS_COS_STR[]= "abs_cos";
+ static const char FILTER_ABS_HAMMING_STR[]= "abs_hamming";
+ static const char FILTER_SHEPP_STR[]= "shepp";
+ static const char FILTER_BANDLIMIT_STR[]= "bandlimit";
+ static const char FILTER_SINC_STR[]= "sinc";
+ static const char FILTER_COS_STR[]= "cos";
+ static const char FILTER_HAMMING_STR[]= "hamming";
+ static const char FILTER_TRIANGLE_STR[]= "triangle";
+
+ static const char FILTER_METHOD_CONVOLUTION_STR[]= "convolution";
+ static const char FILTER_METHOD_FOURIER_STR[]= "fourier";
+ static const char FILTER_METHOD_FOURIER_TABLE_STR[]="fourier_table";
+ static const char FILTER_METHOD_FFT_STR[]= "fft";
+#if HAVE_FFTW
+ static const char FILTER_METHOD_FFTW_STR[]= "fftw";
+ static const char FILTER_METHOD_RFFTW_STR[]= "rfftw";
+#endif
+
+ static const char DOMAIN_FREQUENCY_STR[]="frequency";
+ static const char DOMAIN_SPATIAL_STR[]="spatial";
+
+
+ SignalFilter (const char* filterName, const char* filterMethodName,double bw, double signalIncrement, int n, double param, const char* domainName, const int zeropad = 0, const int preinterpolationFactor = 1);
+
+ SignalFilter (const FilterID filt_type, FilterMethodID filterMethodID, double bw, double signalIncrement, int n, double param, const DomainID domain, const int zeropad = 0, const int preinterpolationFactor = 1);
+
+ SignalFilter (const char* filterName, const char* domainName, double bw, double param);
~SignalFilter (void);
double* getFilter (void) const
{ return m_vecFilter; }
- double convolve (const double f[], const double dx, const int n, const int np, const FunctionSymmetry func_type) const;
+ int getNFilterPoints (void) const
+ { return m_nFilterPoints; }
+
+ double convolve (const double f[], const double dx, const int n, const int np) const;
+
+ double convolve (const float f[], const double dx, const int n, const int np) const;
+
+ void filterSignal (const double input[], double output[]) const;
+ void filterSignal (const float input[], double output[]) const;
+
+ static void finiteFourierTransform (const double input[], complex<double> output[], const int n, const int direction);
+ static void finiteFourierTransform (const complex<double> input[], complex<double> output[], const int n, const int direction);
+ static void finiteFourierTransform (const complex<double> input[], double output[], const int n, const int direction);
+
+ void finiteFourierTransform (const double input[], complex<double> output[], const int direction) const;
+ void finiteFourierTransform (const complex<double> input[], complex<double> output[], const int direction) const;
+ void finiteFourierTransform (const complex<double> input[], double output[], const int direction) const;
- double convolve (const float f[], const double dx, const int n, const int np, const FunctionSymmetry func_type) const;
+ void setTraceLevel (int traceLevel) {m_traceLevel = traceLevel; }
- static double spatialResponseCalc (FilterType fType, double bw, double x, double param, int n);
+ bool fail(void) const {return m_fail;}
+ const string& failMessage(void) const {return m_failMessage;}
- static double spatialResponseAnalytic (FilterType fType, double bw, double x, double param);
+ const string& nameFilter(void) const { return m_nameFilter;}
+ const string& nameDomain(void) const { return m_nameDomain;}
+ const FilterID idFilter(void) const { return m_idFilter;}
+ const DomainID idDomain(void) const { return m_idDomain;}
+ const double getFilterMin(void) const {return m_filterMin;}
+ const double getFilterMax(void) const {return m_filterMax;}
+ const double getFilterIncrement(void) const {return m_filterInc;}
- static double frequencyResponse (FilterType fType, double bw, double u, double param);
+ double response (double x);
+
+ static double spatialResponse (FilterID fType, double bw, double x, double param);
+
+ static double frequencyResponse (FilterID fType, double bw, double u, double param);
+
+ static double spatialResponseAnalytic (FilterID fType, double bw, double x, double param);
+
+ static double spatialResponseCalc (FilterID fType, double bw, double x, double param, int nIntegral);
+
+ static void setNumIntegral(int nIntegral) {N_INTEGRAL = nIntegral;}
private:
- double *m_vecFilter;
double m_bw;
- FilterType m_filterType;
-
- double spatialResponseCalc (double x, double param, int n) const;
+ int m_nFilterPoints;
+ int m_nSignalPoints;
+ double m_signalInc;
+ double m_filterMin;
+ double m_filterMax;
+ double m_filterInc;
+ double* m_vecFilter;
+ double* m_vecFourierCosTable;
+ double* m_vecFourierSinTable;
+ complex<double>* m_complexVecFilter;
+#ifdef HAVE_FFTW
+ fftw_real* m_vecRealFftInput, *m_vecRealFftSignal;
+ rfftw_plan m_realPlanForward, m_realPlanBackward;
+ fftw_complex* m_vecComplexFftInput, *m_vecComplexFftSignal;
+ fftw_plan m_complexPlanForward, m_complexPlanBackward;
+#endif
+
+ bool m_fail;
+ string m_failMessage;
+ string m_nameFilter;
+ string m_nameFilterMethod;
+ string m_nameDomain;
+ FilterID m_idFilter;
+ FilterMethodID m_idFilterMethod;
+ DomainID m_idDomain;
+ double m_filterParam;
+ int m_traceLevel;
+ int m_zeropad;
+ int m_nOutputPoints;
+ int m_preinterpolationFactor;
+
+ static int N_INTEGRAL;
+
+ static const bool haveAnalyticSpatial (const FilterID filterID);
+ static const FilterID convertFilterNameToID (const char* filterName);
+ static const char* convertFilterIDToName (const FilterID filterID);
+ static const FilterMethodID convertFilterMethodNameToID (const char* filterMethodName);
+ static const char* convertFilterMethodIDToName (const FilterMethodID filterMethodID);
+ static const DomainID convertDomainNameToID (const char* domainName);
+ static const char* convertDomainIDToName (const DomainID domainID);
+
+ void init (const FilterID filt_type, const FilterMethodID filterMethod, double bw, double signalIncrement, int n, double param, const DomainID domain, const int zeropad, const int preInterpScale);
+
+ double spatialResponseCalc (double x, double param) const;
double spatialResponseAnalytic (double x, double param) const;
};
+#endif
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