Re: 20:1 lossless RGB image compression
- From: Jani Huhtanen <jani.huhtanen@xxxxxxxxxxx>
- Date: Sat, 31 Dec 2005 18:08:38 +0200
Tom St Denis wrote:
>
> Anchor wrote:
>> Rhysome delivers 20:1 lossless image compression for
>> sequences of video or film frames.
> But even that, note that things like MPEG-4 hit more than 150:1 ratios
> for lossy compression. So 20:1 isn't that special.
For lossless comrpession it _is_ special (even just in some special cases).
If you think about it, white noise in lsb would restrict lossless
compression to 8:1. So I'm little sceptic about 20:1.
> Heck, it could even be a lossless wavelet [e.g. bin-lifted].
Probably not. Wavelet based lossless compressions show modest performance
when compared to conventional linear prediction schemes. Just compare
JPEG-LS to JPEG2000 (in lossless mode). On the other hand wavelet-transform
gives other nice properties, which aren't found in linear prediction.
--
Jani Huhtanen
Tampere University of Technology, Pori
.
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