%IM_FFT 2D FFT of all images in dataset%%	F = IM_FFT(A)%% INPUT%   A        Dataset with object images (possibly multi-band)%% OUTPUT%   F        Dataset with FFT images%% SEE ALSO% DATASETS, DATAFILES, FFT2% Copyright: R.P.W. Duin, r.p.w.duin@prtools.org% Faculty EWI, Delft University of Technology% P.O. Box 5031, 2600 GA Delft, The Netherlandsfunction b = im_fft(a,varargin)	prtrace(mfilename);		if nargin < 1 | isempty(a)		b = mapping(mfilename,'fixed',varargin);		b = setname(b,'Image FFT');	elseif isa(a,'dataset') % allows datafiles too		isobjim(a);		b = filtim(a,mfilename,varargin);		b = setfeatsize(b,getfeatsize(a));	elseif isa(a,'double') | isa(a,'dip_image') % here we have a single image		a = double(a);		b = fft2(a);		if nargin > 1			for j=1:nargin-1				b = filtim(b,varargin{j});			end		end				endreturn