40 cpl_imagelist * omega_fftw(cpl_imagelist *,
int);
cpl_image * omega_gen_lowpass(int, int, double, double)
Generate a low pass filter for FFT convolution .
cpl_image * omega_mirror_edges(cpl_image *, int, int)
expand image by mirroring edges
cpl_image * omega_get_spatial_freq(cpl_image *, cpl_mask *, double, int, int)
Get low spatial frequency componenets from the flat field using the FFTW.