def butter2d_bp(size, cutin, cutoff, n):
 return (butter2d_lp(size, cutoff, n) - butter2d_lp(size, cutin, n))

def butter2d_bp ( size , cutin , cutoff , n ) : return ( butter2d_lp ( size , cutoff , n ) - butter2d_lp ( size , cutin , n ) )
bandpass butterworth filter in two dimensions .