Re: Advanced Motion Compensation for sub 500kbit DVD Video

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On Friday 19 July 2002 14:15, Dustin Stuart wrote:
> Lourens,
>
> <snip - triangle compression>
>
> <snip - texture streaming>
>
> <snip - motion extraction idea>
>
> Very brilliant indeed :). The multi-resolution analysis thing is
> pretty darn cool. A 'cumulative vector field' is like a sort of
> bezier curve approxomation or a spline or something right?
> Instead of gussain blurring, why not simply average neighboring
> pixels and rescale the image by a factor of 2?

Erm, nah, I'm not yet looking at more than 2 frames. What I mean by 
a vector field is simply a bitmap that has a 2D vector at each 
point rather than a scalar. So motion between two frames can be 
expressed as a vector field where each vector holds the 
displacement of the pixel at that point between the two frames.

The cumulative thing is there because each time a point is displaced 
while trying to distort frame 1 so that it will fit frame 2, this 
displacement is 'added' to the current motion vector field, and the 
final MVF for each blurring level is taken as a starting point for 
the next level. So in the end all the displacements are factored in 
and we have a correct map (well that's the idea. I hope it'll work 
better than the previous 100 brilliant ideas :-)).

> <snip>
>
> >I'm working on an implementation of that now, and I hope to have
> >some results still today, otherwise I'll probably finish it on
> >monday.
> >
> >Lourens
>
> I eagerly wait for you results :) hoping very much you will post
> them. Dust

Ofcourse, I'll post as soon as I have something.

Lourens
- -- 
GPG public key: http://home.student.utwente.nl/l.e.veen/lourens.key
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