[XviD-devel] Full Image Interpolation (was: need sad8bi for direct mode)

[Michael Militzer]

----- Original Message -----
From: "Christoph Lampert" <chl@math.uni-bonn.de>
To: <xvid-devel@xvid.org>
Sent: Tuesday, July 23, 2002 12:28 PM
Subject: Re: [XviD-devel] Full Image Interpolation (was: need sad8bi for
direct mode)


> On Tue, 23 Jul 2002, Michael Militzer wrote:
> >
> > which functionality do you need exactly? bilinear interpolation between
two
> > images?
>
> Forget it! It was an idea based on that ffmpeg does for direct mode
> search, but I just noticed that it may be very bad (or rather very slow)
> and even impossible for INTER4V mode. I'll come up with something else...

ok then

> > I need something similar (but block based) for the qpel support, but
> > image based is no problem at all then. I have some time today and will
add
> > qpel decoding support, the functionality you need will come as a
by-product
> > then ;-)
>
> Fine ;-)
> But I thought Qpel did not use bilinear but some lowpass filtered method
> of interpolation?

yes and no. For the _halfpel_ positions lowpass filtered interpolation is
used but the quarter pixels are calculated by performing a bilinear
interpolation between the halfpel and the fullpel pixels...


Michael