IM_FFT

Fixed mapping for 2D FFT

   F = IM_FFT(A,POST1,POST2,...)
  F = A*IM_FFT([],POST1,POST2,...) F = A*IM_FFT(POST1,POST2,...)

Input
A	Dataset with object images (possibly multi-band)

Output
F	Dataset with FFT images
POST1	Characterstring defining postprocessing by FILTIM
POST2	Characterstring defining more postprocessing by FILTIM

Description

This routine applies the 2D FFT2 routine to all images in A. The result  is complex. See the below example for post processing by FILTIM. It shows  how it can be integrated in the call to IM_FFT.

Example(s)

 delfigs
 prdatafiles;        % make sure PRDATAFILES is in the path
 a = delft_idb;      % load the Delft Image DataBase
 x = a*gendat(4);    % load a subset of 4 images
 % show the centralized log of the powerspectra of the gray images
 show(x*im_gray*im_fft*filtim('abs')*filtim('fftshift')*filtim('log'));
 % post-processing can be included in im_fft
 figure; show(x*im_gray*im_fft('abs','fftshift','log'));
 figure; show(x);    % show the originals
 showfigs

See also

datasets, datafiles, fft2, filtim,