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  • Bijective BWT (6 Comments)

    David Scott has written a bijective BWT transform, which brings all the advantages of bijectiveness to BWT based compressors. Among other things, making BWT more suitable for compression-before-encryption and also give (slightly) better compression.

  • Asymmetric Binary System (113 Comments)

    Jarek Duda’s “Asymmetric Binary System” promises to be an alternate to arithmetic coding, having all the advantages, but being much simpler. Matt has coded a PAQ based compressor using ABS for back-end encoding. Update: Andrew Polar has written an alternate implementation of ABS.

  • Precomp: More Compression for your Compressed Files (3 Comments)

    So many of today’s files are already compressed (using old, outdated algorithms) that newer algorithms don’t even get a chance to touch them. Christian Schneider’s Precomp comes to rescue by undoing the harm.

  • On2 Technologies is Hiring

    There aren’t too many companies working on cutting edge codecs, and of those few this one is hiring. Best of luck.

  • China’s AVS Specifications Available (2 Comments)

    Its old news that China has developed their own Advanced Video Standard to avoid high licensing fees. English translation of the standard is now available, along with the IPR policy. Finally something technical that you can get your hands on to feed your appetite.

Wavelet Image Compression Library 3.0

Posted by Mark Nelson on 18th January 2006 | Permanent Link

So I don’t know anything about Dan Volmer’s wavelet library, but since he’s up to release 3.0, I guess I ought to at least look into it a bit. Here’s what he has to say about it:


It is a fairly simple but thus compact (executable with compression and decompressing is 30kb uncompressed) and relatively speedy image compression library, that provides up to 16 channels per file and combines lossless with lossy compression in a single algorithm, that can even be changed from channel to channel. As it’s based on the wavelet transform, it allows for progressive decoding (which means that if you only have the beginning of the file, you get a lower quality version of the whole file) and can also extract smaller “thumbnails” of the original image.

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