Author Page
A 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 […]
lz.adb
Ada source for compression based on the LZH package.
VCEG 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.
Entropy on the web
Describe as Some resources of information theory and entropy concepts on the Internet.
GWIC - 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 […]
PPM 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.
Amiga 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.
AG 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.html
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.
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.
The CWI Audio File Formats Guide
Useful links to information describing audio file formats.
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.html
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.
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.
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.
Explanation of 2D DCT (Discrete Cosine Transform)
Notes for an Info Theory course at MIT.
LZW Examples
Notes from an Information Theory course at MIT.
http://www-mtl.mit.edu/Courses/6.095/notes/LZW-examples.html
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
Fractal Image Compression
Online demos of Fractal compression and decompression. Available in English, French, and German.
Distance 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.de
Overview 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
Archive Comparsion Test 2.0
ACT - by Jeff Gilchrist. ACT is the Archive Comparison Test, a long running benchmark on well known archiving programs. Lots of good updates in May of 2002.
PPMD var I1
From the archive: PPMd program is file-to-file compressor, it is written for embedding in user programs mainly and it is not intended for immediate use. I was interested in speed and performance improvements of abstract PPM model [1-5] only, without […]
Nancy 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.pdf
Nancy Codec Technology
Six more slides describing the Nancy codec.
http://datacompression.info/Miscellaneous/NancyTechnologynetwork.pdf
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.
Vcodex: 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.
Bit oriented input and output in Java
DevX published this nice piece describing bit oriented I/O in Java. This might not be directly related to Data Compression, but it is a requirement in nearly all data compression software. This site may require registration, I’m not sure.
http://archive.devx.com/java/free/articles/gt052002/gt052002-1.asp
Cal Tech improves on 3D compression
CNN reports on a research team at Cal Tech that has created a new algorithm for compressing 3D object representations. If you can figure out how it works from this article, send me an email!
http://www.cnn.com/2002/TECH/internet/05/24/3d.graphics.idg/index.html
Toshiba licensing MPEG-2 Codec
EETimes has an article about this new single-chip MEPG-2 codec built around Toshiba’s Media Embedded Processor architecture.
