[M4IF Technotes] information regarding halfpel interpolation in the quartersample mode

[Vinod Kumar]

Hello
	i have a confusion regarding halfpel interpolation in the quartersample
mode. The standard says "a reference block of size (M+1)x(N+1) biased in
the direction of the half or quarter sample position is read from the
reconstructed and padded reference VOP." what does biased hear mean? Do
I have to calculate the half pel values 8 times for the eight adjacent
positions around the Integerpel mv? If anybody have any web reference
regarding the principle of quarterpel interpolation please do let me
know.
-- 
Vinod