Re: Advanced Motion Compensation for sub 500kbit DVD Video

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On Friday 19 July 2002 14:44, Dustin Stuart wrote:
>
> >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.

Yeah, it's just an intermediate step. Once we have the motion vector 
field for a whole sequence of frames we can do all sorts of fancy 
things with it. Use it to separate objects in the frame, 3D wavelet 
compress it, use predictive encoding, turn it inside-out and upside 
down, paint it in psychedelic colours, erm, well, whatever.

By the way, resampling to a lower resolution may also work well, and 
save a lot of processing. I'll give that a shot too.

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