Re[2]: [XviD-devel] Global Motion Compensation

Michael Niedermayer xvid-devel@xvid.org
Fri, 25 Oct 2002 14:55:30 +0200


Hi

On Friday 25 October 2002 14:34, Radek 'sysKin' Czyz wrote:
[...]
> > the 1-3 reference points are in 1/2 pel resolution
> > btw, these referenece points specify the corners of the new image in the
> > reference image
>
> Hmm OK. So if there is only one point (translation), I have a halfpel
> resolution? 
yes for luma

> Is the GMC referece picture made by interpolation (so it
> would just be a copy of REf, REfH, RefV, RefHV in halfpel mode - and
> we have to re-compute halfpel reference in qpel mode?)) or there is
> some special filter (well I guess not).
it might by identical if the precission is set to 1/2 othererwise chroma will 
be in 1/4 pel bilinear (if i understand the mpeg4 standart correctly)

[...]

Michael