numpy.fft.
rfft2
Compute the 2-dimensional FFT of a real array.
Input array, taken to be real.
Shape of the FFT.
Axes over which to compute the FFT.
New in version 1.10.0.
Normalization mode (see numpy.fft). Default is None.
numpy.fft
The result of the real 2-D FFT.
See also
rfftn
Compute the N-dimensional discrete Fourier Transform for real input.
Notes
This is really just rfftn with different default behavior. For more details see rfftn.