2-D fast Fourier transform
Y = fft2(
returns
the two-dimensional
Fourier transform of a matrix using a fast Fourier transform
algorithm, which is equivalent to computing X
)fft(fft(X).').'
.
If X
is a multidimensional array, then fft2
takes
the 2-D transform of each dimension higher than 2. The output Y
is
the same size as X
.