[vorbis-dev] video compression using textured polygons?

[Jelle Foks]

Lourens Veen wrote:

> "Timothy J. Wood" wrote:
> >
> [snip]
> >    If you have previous frame, however, you could look at how the pixel
> > values change as the edge moves over them.  This could lead you to
> > determine that the edge is solid and as the edge moves over background
> > pixels, they quickly take on the color of the surface attached to that
> > edge.
>
> It would seem that having the triangles to be non-overlapping is
> actually rather restrictive. Allowing overlapping triangles as well
> would improve compression I think, but it would also make the encoder a
> lot more complicated. Then again, if we follow the standard way of
> defining a bitstream/decoder format only then encoders can improve with
> time.
>
> >    Or, they might take on a function of the color of the surface attached
> > to that edge (if you have a translucent surface), for example.  In
> > either case, by exploiting frame coherence, you might be able to
> > eliminate noise on the edges (or having to transmit extra cleanup data)
> > by figuring out whether you can compute the data using alpha blending.
>
> Ouch, I hadn't thought about translucent objects yet. Actually that will
> probably severely hamper compression, since the encoder will see it as
> an ever changing texture, unable to get any meaningful edge information
> from it.
>
> This is going to be very tricky methinks. Imagine 3 translucent layers
> on top of each other. How is the encoder ever going to figure out what
> is what? Needs heavy thought...
>

And imagine clouds or flames. Or reflection (both diffuse and non diffuse). How
about the number of objects to track when there is rain or snow?

Suggestion for 'test' movie: Rotating, folding, crumbling and burning partly
translucent and partly reflecting objects in the rain and throw in the good-old
basketball game in the background... ;-))

Cya

Jelle.

>
> Lourens
>
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