Re: Compression of very large images
- From: Thomas Richter <thor@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: 18 Aug 2005 16:39:00 GMT
Hi,
> I would like to specify that i need to decompress all the image
> completely every time. What I mean is that I am kinda familiar with
> PAQ code and that i'm not really a newbie in compression. I'm open to
> either lossless or lossy compression. I read about a lot of lossless
> image compressors (bmf,calic,etc) but these are old (it could be also
> that my sources aren't good). So I was wondering if it is possible to
> have a better compression than JPEG2000 using, I don't know, maybe a
> PAQ specific adaption algorithm. That can take time to compress but
> that is faster to decompress and I mean a lot faster. I know about the
> AnalogModel(for audio,bmp,etc) in PAQ but I'm not sure how it works.
If lossless is fine for you, and you really need to compress and decompress
all of the image, and it must be really, really fast, then my answer
would be JPEG-LS. It is a very simple algorithm, is stunningly fast, and,
for lossless, performs better than JPEG2000.
So long,
Thomas
.
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