Re: [Opendivx] Reusability

[prakash <prakash@cs.tut.fi>]

Looking through the encore code, dwt is not implemented for encoding the
texture. I think i did not phrase the question properly. The idea here is
to do a real time transcoding from MPEG-2 to MPEG-4 without complete
decoding. The idea is to resue the motion vectors and dct co-efficients as
much as possible. Since the implementation of encore works completely with
vops(foreground/background detection, scene change detection, ...etc), I
am still wondering how to go about this. Any suggestions would be quite
helpful.

with regards
Prakash













On Wed, 31 Jan 2001, Thomas Hargrove wrote:

> I was under the impression that MPEG4 uses DWT instead of DCT.  (The W
> stands for wavelet).
>
> Am I wrong?
>
> --Tom
>
> ----- Original Message -----
> From: "Nick Feamster" <feamster@lcs.mit.edu>
> To: "prakash" <prakash@cs.tut.fi>
> Cc: <Opendivx@lists.projectmayo.com>
> Sent: Wednesday, January 31, 2001 8:08 AM
> Subject: Re: [Opendivx] Reusability
>
>
> > The motion estimation done in MPEG-4 is similar to that done in MPEG-2.
> > Both use block matching and motion estimation on 16x16 blocks, with an
> > option to have 4 motion vectors per block.  I am not sure if the DCT
> > coefficients are the same though...
> >
> > Nick
> >
> > On Wed, 31 Jan 2001, prakash wrote:
> >
> > > Hello all,
> > > Is it possible to reuse the motion vectors/dct from other mpeg standards
> > > here? How different are the motion vectors here when compared to mpeg-2?
> > >
> > > with regards
> > > Prakash
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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