Y = ifft2(X)
Y = ifft2(X,m,n)
ifft2(X)
returns the two-dimensional inverse fast Fourier transform of matrix X
.
ifft(X,m,n)
returns the m-
by-n
inverse transform.
X
, ifft2(fft2(X))
equals X
to within roundoff error. If X
is real,
ifft2(fft2(X))
may have small imaginary parts.
ifft2(X)
is the same as the algorithm for fft2(X)
, except for a sign change and scale factors of [m,n] = size(X)
. The execution time is fastest when m
and n
are powers of 2 and slowest when they are large primes.
fft
,fft2
,fftshift
,filter
,ifft
dftmtx
, freqz
,specplot
, andspectrum
in the Signal Processing Toolbox
(c) Copyright 1994 by The MathWorks, Inc.