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ifft2
Two-dimensional inverse fast Fourier transform.
Y = ifft2(X) Y = ifft2(X,m,n)
Y = ifft2(X)
returns the two-dimensional inverse fast Fourier transform (FFT) of the array X. If X is a vector, Y has the same orientation as X.
Y = ifft2(X,m,n)
truncates or zero pads X, if necessary, to create an m-by-n array before performing the inverse FFT. The result Y is also m-by-n.
For any X, ifft2(fft2(X)) equals X to within roundoff error. If X is real, ifft2(fft2(X)) may have small imaginary parts.
ifft is part of the standard MATLAB environment.
The algorithm for ifft2 is the same as that for fft2, 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 two and slowest when they are large primes.
ifft2 is part of the standard MATLAB environment.
N-dimensional fast Fourier transform (see MATLAB Function Reference). |
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N-dimensional inverse fast Fourier transform (see MATLAB Function Reference). |