[Ffmpeg-devel] [Fwd: [CinCVS] New anti-patented algorithm for better Y'CbCr]

Rich Felker dalias
Sun Mar 18 19:29:20 CET 2007

On Sun, Mar 18, 2007 at 05:46:57PM +0100, Stefan de Konink wrote:
> Hash: SHA512
> This message was on the Cinelerra mailinglist, maybe some devs are
> interested in the methods used.
> Stefan
> - -------- Original Message --------
> I think I have already sent you an e-mail about Twibright Hyperluma. I
> have developed two even better algorithms that reach amazing SNR
> concerning colour detail distortion when encoding into 4:2:0 or 4:2:2
> Y'CbCr.
> The are called Hyperluma 2 and Luminaplex. See
> http://ronja.twibright.com/hyperluma.php

Just from a casual reading of the page, it sounds stupid. The author
somehow things a 12.96 megabyte lookup table in his implementation
"improves performance", which signals incompetence right away.

Also, it sounds like what he's trying to compensate for his crappy
devices that use nearest-neighbor for chroma resampling. Obviously
this is idiotic to begin with. If you want high quality output, use a
proper resampler..

All of this is based on a very casual reading; the page was long and
ill-organized so that I couldn't quickly figure out what problem the
author claims to be solving. If you have a better idea what it's about
please fill me and others in on it.


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