RICAZip.com has proprietary lossless image compression technology called RICA (Reversible Image Compression Algorithm). RICA retains original file formats (e.g. TIFF, DICOM, BMP, TGA, PGM etc.). RICACom says We have yet to find any method that provides better compression ratios (for truly lossless), including wavelet. On a PII 450MHz RICA compresses @ 6MB per second and decompresses at 12MB per second.
Available as a standalone image archive app, Adobe Photoshop Plugin, Browser Plugin, and RICA SDK.

DCL reader Karen H. says: Evaluation of this product demonstates excellent compression ratios and it is also very fast compared to other methods I have used.

http://www.ricazip.com/

Mohamed Qasem’s page dealing with VQ. A nice overview of what it’s all about, plus links to other sites and people in the VQ world.

http://www.geocities.com/mohamedqasem/vectorquantization/vq.html

32bit pmode compression library based on the algorithm used in aPACK. Both the library and some samples are included on this page.

http://home19.inet.tele.dk/jibz/apack/products_aPLib.html

The definition from Paul E. Black’s dictionary.

http://www.nist.gov/dads/HTML/huffmanEncoding.html

The very long title of this PDF format paper pretty much obviates the need for any more description on my part.

http://www.dclunie.com/papers/spie_mi_2000_compression.pdf

The Open Mash Consortium supports the Mash streaming media toolkit and distributed collaboration applications based on the Internet Mbone tools and protocols. The consortium is funded by a grant from the National Science Foundation Internet Technologies Program (Grant ANI-9907994) and by contributions from consortium members.

http://www.openmash.org/

This link takes you to Malcom’s RKAU program, a lossless audio compressor. Malcom’s page says it often beats WA in max mode, at double the speed.

http://rksoft.virtualave.net/rkau.html

A survey paper by Julia Abrahams.

http://www.ims.cuhk.edu.hk/~cis/2001.2/Abrahams.pdf

ZFilter is the ZIP indexing filter for SharePoint, Internet Information Server, Site Server and Microsoft Exchange server. ZFilter is a library that handles .zip archives and returns indexable text and value properties in a similar way to the MS Office filter and the PDF filter supplied by Adobe. The library handles all zip archives created with WinZip, PKWare and DynaZip, indeed any archive created using the compression format based on PKWare.

Satisfied DataCompression.info user Jim R. had this to say:I’ve been searching high and low for exactly this thing for years, and now I’ve found it, and it works.

http://www.4-share.com/content/products.htm

This product creates Zip files with long filenames under MS-DOS. It supports FAT32 and NTFS, and is designed to give you an easy way to back up your data when your Win32 machines decides not to boot. It’s Free!

http://ldzip.freeservers.com/

A paper describing a compression scheme for bitonal images. Complete text of paper in compressed postscript.

http://www.cs.utu.fi/tko/reports/R-92-6.html

Geoff Davis’s home page. Geoff has published several of his wavelet papers on the web, including an interesting analysys of Fractal compression in terms of wavelets. At one time Geoff Davis was responsible for a Wavelet toolkit, but it isn’t on his new site. Please forward pointers is you find it.

http://www.geoffdavis.net/

A set of links from Softpanorama, the Open Source Software Educational Society. A lot of information on the entire site. The compression links are not as complete, but some interesting stuff here.

http://www.softpanorama.org/Algorithms/compression.shtml

These pages will test the various features available for GIF89a animation. Each feature is tested as independently as possible, allowing you to identify what features your browser supports and how well. The pages isolate features to prevent combination collisions (one error causing another feature to fail). Each test is composed of an animation that tests the most basic quality of the function.

http://members.aol.com/royalef/browtest.htm

This is a copy of the original GIF specification from CompuServe. It was expanded significantly by the 1989 specification.

http://members.aol.com/royalef/gif87a.txt

Another copy.

http://members.aol.com/royalef/gif89a.txt

Royal Frazier’s All About GIF89a, a bountiful page of documentation on the file format.

http://members.aol.com/royalef/gifabout.htm

Technical report CUED/F-INFENG/TR.156 , Cambridge University Engineering Department, by Tony Robinson. A somewhat terse technical report describing some of the theory behind the design of the Shorten program.

http://citeseer.nj.nec.com/robinson94shorten.html

A study at the University of Florida showed that even mildly compressing coronary angiograms led to an increase in diagnostic errors.

http://www.eurekalert.org/pub_releases/2000-05/UoF-Itda-3105100.php

Jim Mischel’s article from Visual Developer discussing the use of Microsoft’s CABINET.DLL to work with CAB files.

http://www.mischel.com/pubs/grab_a_cab.htm

An LZW variant that has been adopted as a standard by the ECMA.

http://www.ecma.ch/ecma1/STAND/ECMA-151.HTM

The ECMA has a standard defintion for Arithmetic Coding.

http://www.ecma.ch/ecma1/STAND/ECMA-159.HTM

A standard.

http://www.ecma.ch/ecma1/STAND/ecma-321.htm

This page has the standard publication that defines ECMA-222, which is also apparently known as ALDC. I don’t know where this standard is used.

http://www.ecma.ch/ecma1/STAND/ECMA-222.HTM

Les Atlas at the University of Washington has developed a new method for coding speech and music for transmission over slow lines. The technique, called fine-grain scalable audio encoding, prioritizes the most important part of the signal, allowing reconstruction at the remote end even if the face of lost packets.

http://www.eurekalert.org/pub_releases/2001-05/UoW-Ntfs-1305101.php

Jules Gilbert has made a number of interesting and provocative posts to comp.compression. His claims have been met with vocal objections, but lack of public resolution will hamper the interested researcher.

http://groups.google.com/groups?as_ugroup=*compression*&as_uauthors=Jules%20Gilbert&hl=en

Advanced Zip Repairer(AZR) is a powerful tool to repair corrupted Zip files and Self Extracting files(SFX). It can recover your data in zip archives as much as possible, so to minimize the loss in file corruption. Currently AZR can fix all sub-types of zip files and all kinds of self-extracting files, also it will provide a tiny exe stub when repairing SFX files. Moreover, it has integrated with windows shell and supported drag & drop operations, which will make you repair files easily and quickly.

http://www.qwerks.com/product.asp?ProductID=3509

Nancy is the name of a lightweight video codec being used to send video email in the J-Phone design in Japan. The proprietary algorithm uses something called the Structured Meta Scale Polygon to compress data with fewer MIPS than its competition. Nancy can compress and decompress 30 fps at QCIF resolution with as little as 50 MIPS, using on ly 30-49Kbytes of memory.

http://www.eet.com/story/OEG20011130S0080

The University of Central Florida Data Compression Lab has a lot of interesting stuff here. More than just academic papers, for example the M5 online compression utility!.

http://vlsi.cs.ucf.edu/

The University of Central Florida has this web page which allows you to upload a file and then compress it using a wide variety of algorithms.

http://vlsi.cs.ucf.edu/upload.html