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how to use the vlib-----VLIB_mixtureOfGaussiansS16

Hello,everyone

   When  use the function VLIB_mixtureOfGaussiansS16,I have some questions.It's description as follow

 VLIB_mixtureOfGaussiansS16(
const unsigned char* restrict Im,
short* restrict wt,
short* restrict mu,
short* restrict var,
unsigned char* restrict compNum,
unsigned char* restrict updateMask8,
unsigned int* restrict Im_mask,
const int im_size,
const short alpha,
const short rho,
const short delta,
const short T,
const short ini_wt,
const short ini_var
);

I found that the elements in Im_mask  all equal zero when run  ti's test project. I don't  know the reason, and also how can I get the alpha,delta,T ,ini_wt,int_var  ?Hope for everyone's help sincerely.Also the Im_mask is packed, what 's mean?