int im_disp_ps(in, out)
IMAGE *in, *out;
The function finds the fourier transform of the input (if in is not complex) and then the amplitude power spectrum is created (im_c2ps(3) ). The power spectrum is passed through a non-linear transformation (im_scaleps(3) ). The final image has the four quadrants rotated in such a way that the coordinate (0,0) is near the centre of the image (im_rotquad(3) ).
Input should be a square image with size power of 2. The maximum size of the input image is dictated by the available RAM.