fftw                 package:rimage                 R Documentation

_A_p_p_l_y _F_F_T _t_o _2-_D_i_m_e_n_s_i_o_n_a_l _D_a_t_a

_D_e_s_c_r_i_p_t_i_o_n:

     This function applies FFT to 2-dimensional data (i.e. image) using
     fftw library.

_U_s_a_g_e:

     fftw(img, dir = -1, debug=FALSE)

_A_r_g_u_m_e_n_t_s:

     img: target image

     dir: set -1 for normal transformation and  1 for inverse
          transformation

   debug: set TRUE if you want to output debug message

_V_a_l_u_e:

     a matrix of complex number

_R_e_f_e_r_e_n_c_e_s:

     FFTW (Fastest Fourier Transform in the West) <URL:
     http://www.fftw.org>

_S_e_e _A_l_s_o:

     'fftw'

