[vorbis-dev] video codec

Marco Al marco at simplex.nl
Fri Feb 9 11:52:48 PST 2001



From: "Steve Underwood" <steveu at coppice.org>

> I have a Bugs Bunny cartoon. Its a bit old and noisy. I put it through a
> codec that tends to glide over the noise. Those big areas of noisy
> colour, which should be bland and textureless, have become smoother. The
> result might actually look better than the original. I am happy.
>
> Now I come to a natural history film. A close up of a cat with mottled
> fur. Its a moving, and the picture is a mass of rapidly changing detail
> - a lot like noise. The codec suppresses it. Now I'm not so happy.

Thats not the point, its the user's responsibility to present the image as he
would like them compressed. Suggesting using a noise polluted source to test is
doing things backwards... if it removes them its ok and if it doesnt remove them
its still ok, well that was a usefull test. Test with an image sequency which
naturally has high frequency components.

Marco

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