RE: [AVT] Question bout motion vector

["Gary Sullivan" <garysull at windows.microsoft.com>]

Adam is completely correct.  The video coding format standard doesn't
tell anyone how to find good motion vectors.  That is up to encoder
designers to figure out on their own.  (But the method described by
Kelly is a pretty good method if you can stand the complexity, and it is
what we use in what we call the "Joint Model" reference encoding
algorithm.)

This discussion may not necessarily be totally on-topic for AVT, as it
has nothing to do with transport.  I hope no one minds.

Best Regards,

Gary Sullivan

+> -----Original Message-----
+> From: avt-bounces at ietf.org [mailto:avt-bounces at ietf.org] On 
+> Behalf Of Adam Li
+> Sent: Friday, November 04, 2005 12:03 PM
+> To: 'Tom-PT Taylor'; 'Kelly Huang'
+> Cc: avt at ietf.org
+> Subject: RE: [AVT] Question bout motion vector
+> 
+> As far as I know, video coding standards specify the syntax 
+> and code, and
+> usually do not specify how one comes up with the decisions 
+> (for example on
+> which motion vector to use).
+> 
+> Just my 2 cents.
+> 
+> Adam
+> 
+> > -----Original Message-----
+> > From: avt-bounces at ietf.org [mailto:avt-bounces at ietf.org] 
+> On Behalf Of Tom-
+> > PT Taylor
+> > Sent: Friday, November 04, 2005 7:23 AM
+> > To: Kelly Huang
+> > Cc: avt at ietf.org
+> > Subject: Re: [AVT] Question bout motion vector
+> > 
+> > I did some quick searching via Google.  As best I can see, the UVLC
+> > approach was part of the work on H.26L in Study Group 16.  
+> I was going
+> > to SG 16 while they were working on this, but it wasn't in 
+> my area of
+> > interest.  I think the work migrated into an annex to 
+> MPEG-4. Hoin the
+> > ITU-T counterpart H.264.
+> > 
+> > Gary Sullivan (garysull at microsoft.com) may be able to help you.
+> > 
+> > Kelly Huang wrote:
+> > > Dear experts,
+> > >
+> > > When finding the best motion vector, we
+> > > minimize the following equation
+> > > "J(m,\lambda) = SAD(s,c(m))+\lambda R(m-p), where the 
+> rate term R(m-p)
+> > is
+> > > estimated by UVLC table.
+> > >
+> > > I have searched for this table for a long long time.
+> > > I was wondering if anyone knows where could I find this
+> > > table.
+> > >
+> > > Best Regards
+> > > Kelly
+> > >
+> > >
+> > >
+> > > 
+> -------------------------------------------------------------
+> -----------
+> > >
+> > > _______________________________________________
+> > > Audio/Video Transport Working Group
+> > > avt at ietf.org
+> > > https://www1.ietf.org/mailman/listinfo/avt
+> > 
+> > 
+> > _______________________________________________
+> > Audio/Video Transport Working Group
+> > avt at ietf.org
+> > https://www1.ietf.org/mailman/listinfo/avt
+> 
+> 
+> 
+> _______________________________________________
+> Audio/Video Transport Working Group
+> avt at ietf.org
+> https://www1.ietf.org/mailman/listinfo/avt
+> 

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