[Mp4-tech] question about 4 mv

[Wang]

Dear all:
Now I am engaged in the motion estimation algorithms.
In the VM18.0, about the 4 mv, 
"The (x,y) pair resulting in the lowest SAD16 is chosen as the 16x16 integer pixel motion vector, V0, .....likewise, the (x,y) pair resulting in the lowest SAD8(x,y) are chosen to give the 4 8x8 vectors V1, V2, V3, V4."
"8x8 search is centered around 16x16 vector, with a search window of +/-2 pixels"
I want to know that for every block, the (0,0) vector is located at 16x16 vector? Or the (0,0) point of  each bock is the corresponding block of the Macroblock dedicated by 16x16 vector?
thanks
Yours
Wang
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