Program sfbilstack | Bilateral stacking. 
[SYNOPSIS]
sfbilstack < in.rsf > out.rsf weight=weight.rsf verb=n niter=20 bilat=n ax= bx=
[PARAMETERS]
float   | ax | = |   | 	Gaussian weight for the range distance 
bool    | bilat | =n |  [y/n] | 	if y, bilateral smoothing 
float   | bx | = |   | 	Exponential weight for the domain distance 
int     | niter | =20 |   | 	number of iterations 
bool    | verb | =n |  [y/n] | 	verbosity 
file    | weight | = |   | 	auxiliary output file name
[DIRECTORY]
user/yliu
