[M4IF Technotes] Motion Estimation

[Arcin Bozkurt]

SAD(0,0) - (N_b / 2 +1)
formula is used in the VM18.0 to get the SAD(0,0) value.
It is counter-intuitive for N_b to be related to the VOP. I would espect it 
to be related to the number of elements being summed up in the SAD(x,y) 
calculation.
Can someone point me to any literature or web-sites, where this subtracted 
number, namely, N_b/2+1 is justified?
Thanks
Arcin