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  • Bijective BWT (7 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 (116 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    So many of today’s files are already compressed (using old, outdated algorithms) that newer algorithms don’t even get a chance to touch them.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.

PPMII Updated, ppmdj

Posted by Sachin Garg on 16th February 2006 | Permanent Link

Dmitry Shkarin announced ppmdj, the next revision of ppmdi1. Dmitry Shkarin’s PPMII is the fastest known PPM implementation. Its last revision, ppmdi1 was recently included as an additional algorithm in ZIP format (by WinZip makers).

His comp.compression post is as modest as always:

Hello, All!

Fast implementation of PPMII scheme is placed at
http://www.compression.ru/ds/ppmdj.rar

Apart from the ppmsi (a version with reduced memory requirements) which was released in 2004, this update to ppmd comes after almost 4 years. It features speed and compression ratios slightly better than previous version. It surely would have been difficult to improve perfection. This version also adds support for 64-bit processors and multi-threading.

Its commercial counterpart PPMonstr has also been improved. PPMD is as usual free.

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This entry was posted on Thursday, February 16th, 2006 at 1:02 pm by Sachin Garg. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.