Re: Advanced Motion Compensation for sub 500kbit DVD Video

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.

Oh, now I know exactly what you mean. Wouldn't that take up a lot of space 
with redundant vectors (a string of neighboring pixels all moving exactly 
the same direction). I imagine that would be pretty easy to compress though.

>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 :-)).

Seems pretty darn brilliant to me :).

> > <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

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