二维离散傅里叶变换的实用
二维离散傅里叶变换如何用function f = fft2(x, mrows, ncols)
%FFT2 Two-dimensional discrete Fourier Transform.
% FFT2(X) returns the two-dimensional Fourier transform of matrix X.
% If X is a vector, the result will have the same orientation.
%
% FFT2(X,MROWS,NCOLS) pads matrix X with zeros to size MROWS-by-NCOLS
% before transforming.
%
% See also IFFT2, FFT, FFTSHIFT.
% J.N. Little 12-18-85
% Revised 4-15-87 JNL
% Revised 5-3-90 CRD
% Copyright 1984-2002 The MathWorks, Inc.
% $Revision: 5.13 $$Date: 2002/06/05 17:06:40 $
if ndims(x)==2
if nargin==1
f = fftn(x);
else
f = fftn(x,);
end
else
if nargin==1
f = fft(fft(x,[],2),[],1);
else
f = fft(fft(x,ncols,2),mrows,1);
end
end
请教mrows和ncols是具体数还是一个数组？我使用行数和列数不对，请指教
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