[Mp4-tech] Unrestricted Motion Vectors

[Chaitanya Atluru]

Hi,
    Can someone explain if H.264 (mpeg 4  part 10) uses Unrestricted Motion
Vector (UMV). In H.263 there is an option to restrict MV's to stay inside a
frame. If H.264 restricts MV's does it mean that the extra pixels (eg: if a
4x4 partition is taken it actually requires 9x9 partition for interpolation
of half and quarter pels) needed for interpolation can fall outside the
reference frame or restrictions apply in such a fashion that all the pixels
needed for interpolation fall inside the reference frame.
Thank You
Chaitanya
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