[x264-devel] Re: 1/4 pixel resolution

[Sven Dueking]

. In this Recommendation | International Standard the inter prediction
process can form segmentations for motion representation as small as 4x4
luma samples in size, using motion vector accuracy of one-quarter of the
luma sample grid spacing displacement.  
(ITU-T Rec. H.264 | ISO/IEC 14496-10 AVC)
 
Regards
Sven

  _____  

From: x264-devel-bounce at videolan.org [mailto:x264-devel-bounce at videolan.org]
On Behalf Of leon jorgunsen
Sent: Freitag, 12. August 2005 10:26
To: x264-devel at videolan.org
Subject: [x264-devel] Re: 1/4 pixel resolution



You can even perform 1/8-pel motion compensation...
       
--Leon

> De: Tuukka Toivonen <tuukkat at ee.oulu.fi>
> A: x264-devel at videolan.org
> Objet: [x264-devel] Re: 1/4 pixel resolution
> Date: Thu, 11 Aug 2005 12:43:52 +0300 (EEST)

> On Thu, 11 Aug 2005, Radek Czyz wrote:
>
> > Yes it does have 1/4 pixel resolution, but it's not a feature. It's the
only
> > possible vector resolution in AVC.
>
> Well, one could do motion estimation at 1/2 pixel accuracy,
> and never write 1/4 accurate motion vectors into the bitstream.
> But this makes little sense as the step from integer pixel
> to 1/2 pixel accuracy is much more difficult than 1/2
> to 1/4 (longer interpolation filter).
>
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