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fft1d_r2c.hh
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1 /* -*- mia-c++ -*-
2  *
3  * This file is part of MIA - a toolbox for medical image analysis
4  * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
5  *
6  * MIA is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with MIA; if not, see <http://www.gnu.org/licenses/>.
18  *
19  */
20 
21 #ifndef mia_core_fft1d_r2c_hh
22 #define mia_core_fft1d_r2c_hh
23 
24 #include <mia/core/defines.hh>
25 #include <vector>
26 #include <complex>
27 #include <fftw3.h>
28 
30 
42 {
43 public:
44  struct Complex : public std::complex<float> {
45  Complex(): std::complex<float>(0.0, 0.0) {}
46  Complex(const std::complex<float>& other): std::complex<float>(other) {}
47 #if !defined(FFTW_NO_Complex) && defined(_Complex_I) && defined(complex) && defined(I)
48  Complex(fftwf_complex& v):
49  std::complex<float>(v)
50  {
51  }
52 #else
53  Complex(fftwf_complex& v):
54  std::complex<float>(v[0], v[1])
55  {
56  }
57 #endif
58  };
59 
61  typedef float Real;
62 
68  CFFT1D_R2C(size_t n);
70 
76  std::vector<Complex> forward(const std::vector<Real>& data) const;
77 
83  std::vector<Real> backward(const std::vector<Complex>& data) const;
84 
93  void forward(std::vector<Real>::const_iterator in_begin,
94  std::vector<Real>::const_iterator in_end,
95  std::vector<Complex>::iterator out_begin) const;
96 
97 
107  void backward(std::vector<Complex>::const_iterator in_begin,
108  std::vector<Complex>::const_iterator in_end,
109  std::vector<Real>::iterator out_begin) const;
110 
112  size_t out_size() const;
113 
114 private:
115  struct CFFT1D_R2CImpl *impl;
116 
117 };
118 
120 
121 #endif
CFFT1D_R2C::Real
float Real
A typedef that makes switching between single precicion and double precicion easier.
Definition: fft1d_r2c.hh:61
CFFT1D_R2C::Complex
Definition: fft1d_r2c.hh:44
NS_MIA_BEGIN
#define NS_MIA_BEGIN
conveniance define to start the mia namespace
Definition: defines.hh:33
CFFT1D_R2C::backward
void backward(std::vector< Complex >::const_iterator in_begin, std::vector< Complex >::const_iterator in_end, std::vector< Real >::iterator out_begin) const
CFFT1D_R2C::forward
void forward(std::vector< Real >::const_iterator in_begin, std::vector< Real >::const_iterator in_end, std::vector< Complex >::iterator out_begin) const
CFFT1D_R2C::backward
std::vector< Real > backward(const std::vector< Complex > &data) const
NS_MIA_END
#define NS_MIA_END
conveniance define to end the mia namespace
Definition: defines.hh:36
CFFT1D_R2C
a class to real-to-complex 1D FFTs
Definition: fft1d_r2c.hh:42
CFFT1D_R2C::Complex::Complex
Complex(fftwf_complex &v)
Definition: fft1d_r2c.hh:53
CFFT1D_R2C::CFFT1D_R2C
CFFT1D_R2C(size_t n)
CFFT1D_R2C::forward
std::vector< Complex > forward(const std::vector< Real > &data) const
EXPORT_CORE
#define EXPORT_CORE
Macro to manage Visual C++ style dllimport/dllexport.
Definition: defines.hh:101
CFFT1D_R2C::Complex::Complex
Complex(const std::complex< float > &other)
Definition: fft1d_r2c.hh:46
CFFT1D_R2C::Complex::Complex
Complex()
Definition: fft1d_r2c.hh:45
std
Definition: gsl_iterator.hh:324
CFFT1D_R2C::out_size
size_t out_size() const
CFFT1D_R2C::~CFFT1D_R2C
~CFFT1D_R2C()
defines.hh