[vorbis-dev] video compression using textured polygons?
Timothy J. Wood
tjw at omnigroup.com
Sun Jan 7 02:22:10 PST 2001
This seems like an intesting idea...
So, thinking about the problem it seems that to get edges that look
really good but still have lot data requirements, you're going to have
to do alpha blending.
Imagine a scene where you have a red triangle moving against a
textured background. If you just record the verticies of the triangle
each frame and the corner colors, then when you play back the recording,
you are going to get ugly pixel noise on the edges as pixels pop from
the background color to red (or the other way), or you're going to have
to transmit a bunch of extra data.
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
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.
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