Main Page   Groups   Namespace List   Class Hierarchy   Alphabetical List   Compound List   File List   Namespace Members   Compound Members   File Members   Concepts

vnl_fft_2d.h

Go to the documentation of this file.
00001 #ifndef vnl_fft_2d_h_
00002 #define vnl_fft_2d_h_
00003 /*
00004   fsm@robots.ox.ac.uk
00005 */
00006 
00007 //: In-place 2D fast fourier transform.
00008 
00009 #include <vnl/vnl_matrix.h>
00010 #include <vnl/algo/vnl_fft_base.h>
00011 
00012 template <class T>
00013 struct vnl_fft_2d : vnl_fft_base<2, T>
00014 {
00015   typedef vnl_fft_base<2, T> base;
00016   
00017   //: constructor takes size of signal.
00018   vnl_fft_2d(int M, int N) {
00019     base::factors_[0].resize(M);
00020     base::factors_[1].resize(N);
00021   }
00022   
00023   //: dir = +1/-1 according to direction of transform.
00024   void transform(vnl_matrix<vcl_complex<T> > &signal, int dir)
00025   { base::transform(signal.data_block(), dir); }
00026   
00027   //: forward FFT
00028   void fwd_transform(vnl_matrix<vcl_complex<T> > &signal)
00029   { transform(signal, +1); }
00030   
00031   //: backward (inverse) FFT
00032   void bwd_transform(vnl_matrix<vcl_complex<T> > &signal)
00033   { transform(signal, -1); }
00034   
00035   //: return size of signal.
00036   unsigned rows() const { return base::factors_[0].number(); }
00037   unsigned cols() const { return base::factors_[1].number(); }
00038 };
00039 
00040 #endif

Generated at Fri May 21 01:15:47 2004 for ITK by doxygen 1.2.15 written by Dimitri van Heesch, © 1997-2000