Archives
David Scott’s Bijective Static Entropy Compression
This compressor is designed to operate on English text - it has a static probability table configured for written English.
http://bijective.dogma.net/compres1bse.htmread more from " David Scott’s Bijective Static Entropy Compression "
Peribit
These folks make a box that transparently compresses network traffic. Designed to work on any sort of WAN interface, including T1, E1, ATM, etc. The web site includes an ROI calcuator that will convince you this box will pay for itself!
http://www.peribit.com/Flatcompression
This open source project is working on an ISAPI compression filter, designed for use with IIS. The project is listed as being in beta status by the maintainer, with hopeful comments for the future in the SourceForge discussion forums.
http://sourceforge.net/projects/flatcompressionUniquE’s RAR File Library
The URARFileLib is a small library that allows you to read files from RAR archives created with RAR and WinRAR. Decompression and decryption with full RAR v2.0 compatibility is done directly in your application, thus there is no need for a DLL or any other external file. This file library is based on the free […]
http://www.unrarlib.org/PifPaf zip/unzip
PifPaf zip/unzip is a small and simple drag-and-drop ZIP compressor for MacOS and MacOS X.. PifPaf Mac/Win is a small and simple drag and drop LZW compressor (DiskDoubler type, file’s tree keeping) for MacOS AND Windows (.ssr extension) This is a French language site.
http://croggeo.free.fr/pifpaf/php-forge2/home.phpA Block-sorting Lossless Data Compression Algorithm
Burrows, M. and Wheeler, D.J., A Block-sorting Lossless Data Compression Algorithm, Digital Systems Research Center Research Report 124, May 1994. The original paper on BWT compression. This very effective compression technique was first described in this paper.
Michael Schindler reviewed it thus:Even through it is the first paper about blocksort it is still excellent literature for […]
http://citeseer.nj.nec.com/76182.htmlread more from " A Block-sorting Lossless Data Compression Algorithm "
lz.adb
Ada source for compression based on the LZH package.
http://www.mysunrise.ch/users/gdm/lz__adb.htmAG Information und Komplexität
A nice set of links to various resources related to info theory and data compression. German language.
http://www.mathematik.uni-bielefeld.de/ahlswede/itlinks_f.htmlAmiga compression formats
A good resource for anyone using compression or writing compression code for the Amiga platform. Includes tutorial and background information as well as links to code.
http://www.kyz.uklinux.net/packers.php3PPM FAQ
What appears to be a comprehensive FAQ on PPM programming. Russian language, and fairly slow loading, but no reason not to try Google or BabelFish for a translation.
http://www.arctest.narod.ru/descript/ppm-faq.htmGWIC - GNU Wavelet Image Codec
From the site: GWIC is a simple, fast and relatively efficient lossy image compression algorithm designed for compression of natural images. Currently both gray scale (8 12 and 16bpp) and RGB-images are supported, but in future support for alpha-channels is planned. GWIC is still in the middle of the designing phase, and thus should not […]
http://www.jole.fi/research/gwic/Entropy on the web
Describe as Some resources of information theory and entropy concepts on the Internet.
http://www.mdpi.org/entropy/entropyweb/entropyweb.htmVCEG ftp server
This is described as the ftp server for the Video Coding Experts Group, which is working on H.26L and other video projects. A ton of stuff here, no guideposts or indices, have at it.
ftp://standard.pictel.com/video-site/The Wavelet Tutorial
Supporting material for a Wavelet course at Rowan University. There’s quite a bit of detail here. I don’t know if it stands on its own or whether it only works in conjunction with the course. Please check it out and provide feedback!
http://engineering.rowan.edu/~polikar/WAVELETS/WTtutorial.htmlThe CWI Audio File Formats Guide
Useful links to information describing audio file formats.
http://cui.unige.ch/OSG/info/AudioFormats/Daniel Lemire
Daniel Lemire is a researcher at the National Research Council of Canada. Some of his recent research interest is on wavelet-based prefix sum methods for On-Line Analytic Processing (OLAP). Some of his publications are relevant to compression techniques including a white paper on image compression by wavelets.
http://www.ondelette.com/acadia/Ondolette.com
A forum dedicated to the discussion of Wavelets. This link takes you to the French language version of the board - click on the “English” link on the left side of the page for English language discussion.
http://www.ondelette.com/Fractal Image Compression
Online demos of Fractal compression and decompression. Available in English, French, and German.
http://www.eurecom.fr/~image/DEMOS/FRACTAL/LZW and GIF explained
A guy named Steve Blackstock takes a shot at making this all clear to you. Gives some details on the LZW variation used in GIF files.
http://www.cis.udel.edu/%7Eamer/CISC651/lzw.and.gif.explained.html
LZW Examples
Notes from an Information Theory course at MIT.
http://www-mtl.mit.edu/Courses/6.095/notes/LZW-examples.htmlExplanation of 2D DCT (Discrete Cosine Transform)
Notes for an Info Theory course at MIT.
http://www-mtl.mit.edu/Courses/6.095/notes/dct.htmlread more from " Explanation of 2D DCT (Discrete Cosine Transform) "
MPEG-4: The Standard for Digital Media
Apple has a page with info on MPEG-4. They use this page to explain how this all fits in with QuickTime.
http://www.apple.com/mpeg4/iVAST
This company labels itself as “The world leader in end-to-end MPEG-4 Solutions.” Looks like they sell a suite of authoring and encoding tools, and perhaps some server software. Follow the link to “About MPEG-4″ and you’ll get a little bit of text plus some more links.
http://www.ivast.com/MPEG Audio Layer-3
An overview and explanation about MP3 from the folks at Fraunhofer. If you want to get a good overview in a single web page, this might be the spot for you.
http://www.iis.fhg.de/amm/techinf/layer3/index.htmlDistance Coding post
A post by Edgar Binder discussing his distance coding algorithm. Distance coding is used in place of the MTF stage in BWT compression.
http://groups.google.com/groups?selm=390B6254.D5113AD2%40T-Online.deVcodex: A Discipline&Method Library for Transforming Data
Vcodex is a software collection for transforming data. Examples of data transformers include methods for compression/decompression, data differencing, encryption, etc. The source code distribution includes an implementation of Vcdiff using the framework.
http://www.research.att.com/sw/tools/vcodex/read more from " Vcodex: A Discipline&Method Library for Transforming Data "
Compression Codecs
This site has a nice collection of codecs, including DirectShow filters, MPG4, MJPEG, and other video codecs. A few audio codecs and AVI test sequences as well.
http://dshow.narod.ru/Nancy Codec Technology
Six more slides describing the Nancy codec.
http://datacompression.info/Miscellaneous/NancyTechnologynetwork.pdfNancy Technology
Nine slides that provide some description of the Nancy codec. You will have to ask Acrobat Reader to rotate the slides if you are trying to view them on the screen.
http://datacompression.info/Miscellaneous/NancyTechnologymobile.pdfOverview of the Nancy Codec
This PDF file provides a two page overview of the Nancy codec and the company that’s behind it, NOA, Inc.
http://datacompression.info/Miscellaneous/LightVideoCodecNancyME.pdf