This category covers lossless compression methods that can't be pinned down to one of the more refined topics, such as LZW or Zip. In some cases, the items here are esoteric algorithms that don’t' merit their own topics. In other cases, they span one or more existing topics. The unifying theme is of course that they are lossless. This means that after compressing and then decompressing, the data set in quesition will be bit-for-bit identical.
Lzip is a lossless data compressor based on the LZMA algorithm, with very safe integrity checking and a user interface almost identical to the one of bzip2. Lzip is only a data compressor, not an archiver. It has no facilities for multiple files, encryption, or archive-splitting, but, in the Unix tradition, relies instead on separate external utilities such as GNU Tar for these tasks.
Created: 11/09/2008
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XWRT (XML-WRT) is a high-performance XML compressor (it also works with textual files). It transforms XML to a more compressible form and uses zlib (default), LZMA, PPMVC, or lpaq6 as a back-end compressor. It is similar to XMill, but has many improvements. Takes fourth and third places in LTCB text compression benchmark as for January 2008. The author is Przemyslaw Skibinski.
Created: 29/01/2008
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PeaZip is an archiver tool that supports its native Pea archive format (featuring compression, split volumes, and flexible authenticated encryption and integrity check schemes) and other mainstream formats, with special focus on handling open formats.
Create and extract 7Z, 7-Zip sfx, Bzip2, Gzip, PEA, split, TAR, and ZIP.
Browse and extract CAB, JAR, LZH, RAR and many more archive formats.
Created: 02/02/2007
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Benchmark of over 200 archivers on the world's largest testsets; also features benchmarks on .jpg, .mpg, .pdf, .mp3, .mp4, .mov, .wmv, .rm, Installer packages and other hard-to-compress files; includes the "Ten Commandments of Compression", reports best performances by year and by file format, etc.
Created: 31/01/2007
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The main goal of the performed comparison is getting answers on the following questions regarding lossless video codecs:
What codec or codecs are best for video capture and video editing applications?
What codec or codecs achieve the best compression ratio?
What advantages multithreading gives to modern codecs supporting it?
Only absolutely lossless codecs were studied in this comparison. Only progressive test video sequences were used.
Was tested folowing codecs:
Paper and source code of an efficient binary adaptive encoder of iid sequences.
Outperforms several existing arithmetic-codes-based implementations (JBIG's Q-coder, H.264's CABAC) on short sequences.
Created: 22/01/2007
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The contest is about compressing the human world knowledge as well as possible. The intention of this prize is to encourage development of intelligent compressors/programs. The goal is to compress the first 100MB of Wikipedia better than your predecessors. The total prize is about 50'000€.
Created: 23/12/2006
by Maxim SmirnovMore...
ZipForge.NET is a fast .NET framework zip component. With this toolkit you can easily add zip archive functionality to your projects. Free for personal use. Royalty-free for commercial use. ZipForge.NET is 100% managed .NET component written in pure C#.
Key features:
Creates and handles ZIP files
100% managed native .NET code
Adds, moves, extracts, deletes, updates, tests, refreshes a group of files by a single operation
SFX archives support
Extensive help
A lot of demos (C#, VB.NET and Delphi.NET demos are included)
Royalty-free
Full source code is availaboe
Created: 15/07/2006
by Kevin GoldbergMore...
Hifn makes lossless compression hardware and software. They have a bunch of chips that implement LZS and MPCC compression, plus a library that does the same thing. I have been led to believe that these algorithms are partially or completely protected by patents. M.N.
Created: 18/12/2001
by Mark NelsonMore...
ACB is poorly understood. The author, George Buynovsky, has only made a few public comments on the algorithm. This is one of them.
Created: 06/01/2000
by Mark NelsonMore...
Those folks at AT&T have developed a compressor that can be used to squeeze individual data items in XML documents. AT&T says this is "essentially free" software. Read the license on-line to determine exactly what that means.
Also available on http://sourceforge.net/projects/xmill
Created: 19/12/1999
by Mark NelsonMore...
An overview of the field by Debra A. Lelewer and Daniel S. Hirschberg. Lots of informative text. This appears to be a survey paper that was adapted for presentation on the web. Lossless compression techniques only!
Created: 10/11/1999
by Mark NelsonMore...
Dr. Peter Fenwick's home page. Fenwick has links to several of his compression papers on this page, including several recent papers discussing BWT algorithms.
Created: 01/01/2000
by Mark NelsonMore...
HTMLZip is a utility to creating compressed HTML pages. True compression algorithm reduces files to 20%-70% of original. JavaScript is used for extracting in your browser (no third-party software).
Compatible:
HTMLZip is compatible with MS Internet Explorer 4.0, 5.0, 5.5, Netscape Navigator 4.x, 6.0, Mozilla/M15-M17, Opera 4.0 beta 2.
HTMLZip is not compatible with MS IE 3.0 and NN 3.0.
HTMLZip is not compatible with Opera 4, 5, 6. They has a bug in JavaScript (function indexOf()). We have reported Opera's developers about.
Created: 12/10/2002
by Mark NelsonMore...
BMF program is lossless/near-lossless image compression utility by Dmitriy Shkarin. It supports true colour, high colour, greyscale and paletted images compression.
See last version on http://www.compression.ru/ds/ (in Russian)
Created: 07/11/1999
by Mark NelsonMore...
An introductory paper. Includes information on Huffman coding, Info Theory, Coding, LZ77, LZ78, and more. This page also has a good set of links.
Created: 15/02/1999
by Mark NelsonMore...
The home page for TMW. TMW is a program for losslessly compressing greyscale images that gives world class compression ratios, at the cost of being tremendously CPU intensive. The current version is TMW_0.51, and is still completely experimental
Created: 07/11/1999
by Mark NelsonMore...
Arturo Campos describes a version of arithmetic coding which renormalizes in bytes, thus achiving twice the speed of an standard implementation and 0.01% less compression.
Created: 17/11/1999
by Mark NelsonMore...
Arturo Campos describes a model for arithmetic coding which results in less compression than an adaptative one, but at much higher speeds.
Created: 17/11/1999
by Mark NelsonMore...
Patrick Craig has an interesting tale to tell. Without being a data compression expert, he managed to beat the $5000 compression challenge. You won't see him taking an ocean cruise with his winnings, though. DCL reader commented: The challenge was obviously met.
Created: 25/04/2001
by Mark NelsonMore...
This page has links to the source code for a family of compressors written by Charles Bloom. This includes the LZP family, an LZW example, LZRW, and LZCB.
Created: 14/11/1999
by Mark NelsonMore...
A group of statistical coders from Charles Bloom. This includes several different entropy encoders, including Huffman, Adaptive Huffman, Shannon-Fano, CACM Arithmetic coding, and a Skew Coder.
Created: 06/11/1999
by Mark NelsonMore...
By Rafail Krichevsky, Institute of Mathematics, Russian Academy of Sciences, Novosibirsk University, Russia. This volume constitutes a comprehensive self-contained course on source encoding.
Reader Yuriy R. says: A concise and rigorous course on universal source coding and universal information retrieval. Only suitable for math. oriented readers, graduate students, and researchers in these fields. Engineers expecting to find source-code of data compression algorithms shall look elsewhere.
Created: 19/01/2002
by Mark NelsonMore...
Dynamite is a tool and library for decompressing data compressed with PKWARE Data Compression Library and it was created from the specification provided by a post in the comp.compression newsgroup.
Created: 29/07/2004
by Mark NelsonMore...
This program tries to unpack the given file by application of several algorithms byte-by-byte. Result of work of the program is the set of files with the unpacked data. Many of the produced files are not correct. However, among them there can be correctly unpacked data. Correctly unpacked files have mainly significant sizes that distinguishes them from dust.
Created: 28/07/2004
by Mark NelsonMore...
A compressor built with the world-beating PAQAR 3.0 compressor. axPAQ wraps a GUI around the engine, and includes complete source.
Created: 16/07/2004
by Mark NelsonMore...
I'm pleased to announce with my co-authors availability of a preprint on our new algorithm to estimate the Shannon entropy rate (bits/symbol) or (bits/sec) of an observed sequence of low-alphabet symbols. It uses the Context-Tree-Weighting universal compression method, but doesnot use the compression ratio directly as an entropy estimator but as a scaffold for a Bayesian estimate. The result is significantly lower bias.
Created: 10/07/2004
by Mark NelsonMore...
A J2EE servlet filter which compresses data written to the response. It supports several algorithms (gzip, deflate, etc.) and emphasizes minimal memory usage and high throughput. Also provides detailed performance stats.
Created: 20/06/2004
by Mark NelsonMore...
The zisofs filesystem is an extension to the ISO9660 filesystem that allows files, on a file-by-file basis, to be stored compressed and decompressed in real time. The zisofs filesystem is supported by recent versions of Linux (2.4.14 or later). Legacy systems can still read uncompressed files. zisofs-tools contains the tools necessary to create such a compressed ISO9660 filesystem and to read compressed files on a legacy system.
Created: 20/06/2004
by Mark NelsonMore...
This group at Loughborough University in the UK would like to use sophisticated compression techniques in high speed networks. To make it all happen, they need to do it in hardware, and do it in parallel. This page has information about their efforts, along with links to papers and other information.
Created: 15/05/2004
by Mark NelsonMore...
This open source package, e2compr, provides transparent compression and decompression of Linux ext2 file systems.
Version 0.4.44 is shipping as of April, 2004.
Created: 25/04/2004
by Mark NelsonMore...
Arkadi Kagan has created a C++ project that implements a batch of our favorite lossless algorithms, including LZ77, LZ78, LZW, RLE, along with arithmetic and Huffman coding.
Version 1.1 shipped in April, 2004.
Created: 19/04/2004
by Mark NelsonMore...
A paper by Timothy McLaughlin that gives an overview of HTTP Compression and tries to decide whether it's a good thing for not.
Created: 07/03/2004
by Mark NelsonMore...
Werner Bergmans has created a new benchmark site that aims to show the best compression ratios possible for multiple file types, including English text, executables, graphics, and so on. Werner says he is running these tests with 80-100 programs for each file type!
Reader Werner B. says Useful site to compare results of different compression programs. Regularly updated.
Created: 28/02/2004
by Mark NelsonMore...
This is a Win32 script that can be used to compress and/or delete files after a certain amount of time. Nice and simple.
Version 1.2 shipped in January, 2004.
Created: 01/02/2004
by Mark NelsonMore...
A free program to deal with image formats in popular medical formats, including DICOM, SPM, PNG, and GIF.
Version 0.9.1 of (X)MedCon shipped in January, 2004.
Created: 11/01/2004
by Mark NelsonMore...
A Java implementation of the inverted-index compression systems described in the book Managing Gigaybtes. This GPLed effort doesn't appear to have any connection with Witten, Moffat, or Bell.
Version 0.8.2 is shipping in October, 2003.
Created: 29/10/2003
by Mark NelsonMore...
Free PDF Compressor that removes duplicate PDF objects, optionally takes advantage of new compression features of latest PDF specification (1.5), and optionally takes advantage of a new proposed format called "Compact PDF" that for many classes of documents compresses 30 - 60% better than what is possible in PDF 1.5.
Note: Navigate up two levels to get to Tom's download page.
Version 2.2 is shipping as of February, 2004.
Created: 12/09/2003
by Mark NelsonMore...
Comparisions of over 230 archivers, in handy Excel format, from Berto.
Reader Emiliano C. said "Wonderful! Great! Wonderful! Cool!"
Created: 10/09/2003
by Mark NelsonMore...
This nifty program searches through a normal or compressed mailbox looking for strings. Supports Gzip, Bzip2, and tzip formats.
Created: 18/08/2003
by Mark NelsonMore...
A project whose goal is to implement libraries to support the various and sundry compression formats that Microsoft has cooked up over the years. Early in the process, much work left to be done.
Created: 29/07/2003
by Mark NelsonMore...
by Jurgen Abel and William Teahan. This paper looks at a few different techniques for preprocessing data before performing text compression, and compares the gains achieved when combining the preprocessors with PPM, BWT, and LZ algorithms.
Created: 19/07/2003
by Mark NelsonMore...
Xceed Streaming Compression for .NET is an efficient and lightweight data compression class library for Microsoft .NET and ASP.NET. It can process any size byte array with ease and provides a true .NET pass-through stream object for automatically compressing or decompressing any .NET stream's data on the fly. It supports the GZip, Zlib, Deflate and Deflate64 compression formats.
Created: 22/06/2003
by Mark NelsonMore...
The Xceed Streaming Compression Library is a high-performance "raw" compression library. It offers the ability to compress and decompress streaming data, buffers, strings or single files and supports multiple compressed data formats. Unlike the Xceed Zip Compression Library, this ultralight library doesn't offer Zip file handling capabilities.
Created: 21/06/2003
by Mark NelsonMore...
Xceed Zip for .NET Compact Framework is a data compression and all-purpose file manipulation class library for creating mobile apps. It provides flexible zip, gzip and streaming data compression capabilities for compact applications created with Visual Studio .NET 2003. The library includes an innovative and extensible filesystem object model that makes zip files as easy to work with as regular files or folders.
Created: 21/06/2003
by Mark NelsonMore...
Soft Defender is a good exe file compressor, which can reduce the file size of 32-bit Windows programs by as much as 50%.In addition, Soft Defender is a perfect product of software protection of applications.With Soft Defender, your application can have anti-debugging, anti-tracer, anti-disassemble, anti-dumping, anti-apihook, file integrity checking functions in seconds. It requires no source code editing or your registration algorithm changing.
Created: 12/06/2003
by Mark NelsonMore...
A new article on The CodeProject describing code to compress/decompress to/from an ISequentialStream interface. Code is supplied to implement this for Cfile and CByteArray. The compression itself is done via zlib. The rationale for this project is that the author needed cookbook code that worked with MFC objects.
Created: 21/04/2003
by Mark NelsonMore...
This document describes a lossless audio compressor that does some straightforward prediction in combination with a Rice coder. This is credited to Matt Ashland, author of the Monkey's Audio codec.
Created: 14/04/2003
by Mark NelsonMore...
BitMagic is a C++ library that deals with dynamic bit vectors. It supports a couple of different ways to compress these bit vectors. This page discusses D-Gap Compression.
Created: 14/04/2003
by Mark NelsonMore...
BitMagic is a C++ library that deals with dynamic bit vectors. It supports a couple of different ways to compress these bit vectors. This page explains how to perform common operations on bit vectors while they are compressed in memory.
Created: 14/04/2003
by Mark NelsonMore...
PipeBoost offers HTTP Compression software that comes with a big list of customers and testimonials. You can download a 30 day trial copy, so you have nothing to lose!
Created: 27/03/2003
by Mark NelsonMore...
The press release says: Ikano and SlipStream launched the BrowseBlast Internet service for U.S. consumers. SlipStream's Web Accelerator is supposed to increase connection speed significantly for dial-up and wireless connections. The software compresses Web content once it leaves the server, increasing browsing speeds to five times the traditional dial-up or wireless speed.
Created: 27/03/2003
by Mark NelsonMore...
Context Tree Weighting (CTW) has been a technique with great promise, but it hasn't ever been able to reach the critical mass needed to become more than a curiousity. Jurgen Abel is doing his best to overcome that problem. He's created a nice reference page for CTW on his data-compression.info web site. He has references to a few papers, a few people, and one piece of source code.
Created: 21/03/2003
by Mark NelsonMore...
This appears to be the Data Compression Blue Book published by the Consultative Committee for Space Data Systems. It's a nice document, but I'm not sure if the standard described here is actually in use. As is so often the case with standards documents, I find myself yearning for some accompanying reference code. Alas, there is none that I know of.
Note: a related document discussing performance characteristics of the recommendate can be found
here
Created: 19/01/2003
by Mark NelsonMore...
A company that makes PhotoJazz, a lossless compression plug in package that they describe as having Breakthrough lossless photo-quality compression of stills and movies for archival, print, and the Internet. Version 2.0 supports Mac and Windows, Photoshop, QuickTime, and Quark. You can download the Reader for free and try it out.
Created: 13/12/2002
by Mark NelsonMore...
Supplier of data comrpession libraries to use with FoxPro. Includes FOXSQZ, an archiving and compression library, COMP5, a compression library, and JavaSQZ, a data compression library for Java.
Created: 13/12/2002
by Mark NelsonMore...
A Technical Documentation bulleting from TI that answers the question "What is a Compressed Postscript (.psz) File?"
Created: 13/12/2002
by Mark NelsonMore...
SEQUITUR is a method for inferring compositional hierarchies from strings. It detects repetition and factors it out of the string by forming rules in a grammar. The rules can be composed of non-terminals, giving rise to a hierarchy. It is useful for recognizing lexical structure in strings, and excels at very long sequences.
Created: 09/11/2002
by Mark NelsonMore...
David Clunie is the chair of the DICOM standards committee, and has a wealth of links on this page to information related to medical imaging.
Created: 28/09/2002
by Mark NelsonMore...
Squeezer is another executable compressor for Windows, and it's now free. Here's what you'll read on the Vidfern web site:
Vidfern Squeezer as the best file compressor, can squeeze executable files as well as text and HTML files. Get more space by squeezing your files! Squeezer is now free for personal and commercial use. It is fully functional, easy and powerful.
Reader Vali from the jp TLD said Thanks to all who create this real good product. I found it a very nice and easy compressor that supports exe, html and text files freely!
Created: 15/09/2002
by Mark NelsonMore...
This page gives a short introduction to the DICOM standard, commonly used for medical imaging. It has a lengthy set of links to DICOM viewers, images, and other resources.
Created: 18/08/2002
by Mark NelsonMore...
by P.G> Howard and J.S. Vitter. This paper from DCC '92 describes an improved method for error modeling in hierarchical lossless image compression.
Created: 28/07/2002
by Mark NelsonMore...
An overview of the basics, including Shannon-Fano, Huffman, Arithmetic coding, and a section on LZW for good measure.
Created: 20/07/2002
by Mark NelsonMore...
A senior project whose goal was to design a hardware compressor for continuous tone images. Contains a description of the algorithm, Matlab implementations, chip designs, and more.
Created: 15/07/2002
by Mark NelsonMore...
I'll have to take the word of the submitter on this site - it is entirely written in Japanese. Any DataCompression.info user who is fluent in the language is invited to provide a more detailed description. There are a couple of zip files on the site that perhaps contain demo programs?
Created: 15/05/2002
by Mark NelsonMore...
This company sells an IP core that performs lossless data compression. Not sure what algorithm they are using, it is described as "GEMAC's data compression algorithm." This algorithm was first published at DCC '95, and is described as a hybrid of ZL1 and ZL2, created with the goal of maximizing compression rate.
Created: 14/05/2002
by Mark NelsonMore...
This document describes the Aurora Borealis algorithm, which combines statistical analysis with a back end using an unknown type of coding. Author Michael Asse seems to have high hopes for this technique.
DataCompression.info reader Viktor F. had this to say: This compression method is inefficient. LZW can beat this easily. The author should read some books about compression.
Created: 22/04/2002
by Mark NelsonMore...
This is a bi-level image compression scheme designed to be used for scanned images of books, faxes, etc. It is a non-degrading scheme, but not lossless. The company reports that their current customer list includes GetThePatent.com, FIS|Online, JSTOR, and Kurzweil. More information about clients and partners can be found
here.
Created: 08/04/2002
by Mark NelsonMore...
These guys use compression to increase messaging throughput on your network. Looks like they work with Microsoft Exchange, as well as having a general purpose product for ISPs.
Created: 04/04/2002
by Mark NelsonMore...
A novel algorithm by Stefano Lonardi. It recursively replaces words in text with pointers, and boasts of good results. Source and papers regarding Off-Line can all be found here.
Created: 04/03/2002
by Mark NelsonMore...
UCL is a portable lossless data compression library written in ANSI C. This work is from Markus F.X.J. Oberhumer, known for LZO, UPX and more.
DataCompression.info reader Swift G. had this to say: Excellent library. The compression routines are fast and if you need binary compression this is the way to go.
Created: 27/02/2002
by Mark NelsonMore...
EasyCompression Library is a TFileStream, TMemoryStream and other TStream descendants replacement to their analogues with transparent compression/decompression and encryption in the same stream. All the methods, properties and behavior of TFileStream and TMemoryStream are supported, so it is very simple to replace them in the application code. Key features: Forward and backward seeks in compressed stream; Read and write any portion of data at any file position; OnProgress event handler and compression rate indicator; Password protection provided by Rijndael encryption algorithm; Fastest compression level is extremally fast.
Created: 26/02/2002
by Mark NelsonMore...
by Peter Fenwick, Department of Computer Science, The University of Auckland.
In his work on the information content of English text in 1951, Shannon described a method of recoding the input text, a technique which has apparently lain dormant for the ensuing 45 years. Whereas traditional compressors exploit symbol frequencies and symbol contexts, Shannon's method adds the concept of "symbol ranking", as in `the next symbol is the one third most likely in the present context'.
Created: 19/01/2002
by Mark NelsonMore...
This page has links to online versions of Hirosuke Yamamoto's papers on data compression. Papers here on block sorting, coding, and more. The papers are all published in English.
Created: 01/01/2002
by Mark NelsonMore...
by Frans M.J. Willems, Yuri M. Shtarkov, and Tjalling J. Tjalkens, IEEE Trans. Inform. Theory, Sept. 1996. A postscript version of this overview paper.
Created: 17/12/2001
by Mark NelsonMore...
One page poster for Frans M.J. Willems, Yuri M. Shtarkov, and Tjalling J. Tjalkens, "The Context Tree Weighting Method: Basic Properties," IEEE Trans. Inform. Theory, May 1995. (Postscript)
Created: 17/12/2001
by Mark NelsonMore...
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.
Created: 15/12/2001
by Mark NelsonMore...
The very long title of this PDF format paper pretty much obviates the need for any more description on my part.
Created: 15/12/2001
by Mark NelsonMore...
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.
Created: 05/12/2001
by Mark NelsonMore...
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.
Created: 29/11/2001
by Mark NelsonMore...
Chitaranjan P.S., Arun Shankar, and Niyant .K posted a description of a new coding scheme called LBE on the web. It's interesting, but I'm not sure that it appears to have any serious advantages over current state of the art.
Created: 06/10/2001
by Mark NelsonMore...
Rodrigo Castro has an interesting project going at the University of Sao Paulo in Brasil. Rodrigo is integrating compression with the virtual memory system of Linux. By storing compressed pages in RAM, he hopes to improve overall system performance. The goal is to read and write fewer pages to disk. See the full details on
his project page
at SourceForge.
Created: 03/10/2001
by Mark NelsonMore...
PackWord can compress a Microsoft Word document (.doc) file into a smaller, compressed, .doc file. The compressed .doc file is self-extracting: when loaded into Microsoft Word, the compressed document will automatically expand to the original version.
Created: 28/05/2001
by Mark NelsonMore...
This web page shows a set of images that the author uses to demonstrate the performance of the Eri compressor. The claim is that Eri32 does better on these 24 bit color images than any other lossless compressor.
Created: 08/04/2001
by Mark NelsonMore...
This page is devoted to a new compressor called M99. The author says that M99 is a new type of statistical compressor that has speeds rivaling the fastest Huffman coders with ratios of the best statistical modeling programs. Good!
Created: 02/01/2001
by Mark NelsonMore...
A collection of free TIFF software. This may help you decode files in TIFF format. Includes some documentation files.
Created: 20/08/2000
by Mark NelsonMore...
An overview of the topic by Nam Phamdo, with some basic definitions, plus a look at Huffman coding and LZ78/LZW coding.
Created: 29/07/2000
by Mark NelsonMore...
Cisco talks a bit about new products using V.44 compression licensed from Hughes Network Systems. A few claims, not much in the way of facts.
Created: 14/07/2000
by Mark NelsonMore...
The ITU has officially adopted the v.44 standard, which is starting to ship in mid-2001 on modems supporting the v.92 standard. V.44 uses a compression algorithm known as LZJH, which was invented by Jeff Heath and is owned by Hughes Network Systems. According to Jeff, ITU testing showed that V.44 was 20% to 60% better than V.42bis on
typical internet web downloads.
Created: 11/07/2000
by Mark NelsonMore...
Martin Cohn's home page contains links to several of his compression papers, which seem to be concentrated on lossless compression issues.
Created: 02/07/2000
by Mark NelsonMore...
These folks appear to be selling some lossless compression technology, but I'm not quite able to determine what it is.
Created: 03/06/2000
by Mark NelsonMore...
This company appears to be in the business of packaging demographic data for research and commercial interests. As part of that, they apparently have some technology for performing some compression on the data sets.
Created: 03/06/2000
by Mark NelsonMore...
This site advertises a bunch of nifty looking codecs, including TELP, JPEG, Speech, MPEG, and wavelet compressors. I can't quite determine exactly what form the products come in.
Created: 03/06/2000
by Mark NelsonMore...
This IBM research paper looks into the performance of compressors in relation to the compressibility of the the objects they are compressing. At least I think that's what it is talkinga bout.
Created: 03/06/2000
by Mark NelsonMore...
Source code from Random Access Data Compression, by Philip Gage (see gage.zip) from the Septeber 1997 C User's Journal
Created: 04/05/2000
by Mark NelsonMore...
The description of the point to point protocol, which of course includes a little tiny bit on compression, since you can specify compression in a packet header.
Created: 26/04/2000
by Mark NelsonMore...
by David Salomon. This article discusses an approach to the unique problem of compression sparse binary strings.
Created: 27/02/2000
by Mark NelsonMore...
Solution-Soft is the provider of software for online archiving and for bandwidth management in the Internet infrastructure and the enterprise. Solution-Soft's products enable data files to be archived online and transferred faster over networks through a revolutionary technology providing transparent compression and decompression.
Created: 17/02/2000
by Mark NelsonMore...
NASA says that this data compression algorithm is the Government Invention of the year. It is apparently an algorithm that can be used by spacecraft with limited transmission bandwidith.
Created: 16/01/2000
by Mark NelsonMore...
IBM has developed a pair of Java clases that compress Unicode according to the Standard Compression Scheme for Unicode. Looks like they might be giving it away here.
Created: 28/12/1999
by Mark NelsonMore...
These folks deliver a tool called FLAM which uses a patented data compression algorithm to do something. The site has English and German language versions, but doesn't seem to have any detailed information on FLAM.
Created: 13/12/1999
by Mark NelsonMore...
This site has links to Telvox's CODEC package, which appears to ship in both free and commercial versions. CODEC uses proprietary lossless compression, and is ported to a wide variety of platforms. Telvox is located in Bologna, Italy, and has duplicate web pages in English and Italian.
Created: 26/11/1999
by Mark NelsonMore...
DCG Framework is a object oriented framework for lossless data compression. It is written in C++, and intends to be a didactic framework for data compression teaching. This framework is pointed to by the Seccao de Analise de Sinais page.
Created: 26/11/1999
by Mark NelsonMore...
DAKX is claiming a new method of lossless data compression that is fast and patented. It works on audio and video data. The method is called difference-adaptive compression. DAKX supplies a bit of source code that you can experiment with, and will be happy to license the technology to you or your company.
Created: 23/11/1999
by Mark NelsonMore...
A look at lossless compression techniques, including LZ77, LZSS, LZ78, and LZW. Croatian language.
The original of this page is now missing, any help locating it would be greatly appreciated. You can find an archived copy at the link.
Created: 19/11/1999
by Mark NelsonMore...
Home page for Advanced Hardware Architectures.
AHA makes a few different chips that implement various forms of lossless data compression.
Created: 14/11/1999
by Mark NelsonMore...
Public domain code by Daniel Bernstein. (Note that this ftp site has an excellent selection of compressoin programs and code.)
Created: 13/11/1999
by Mark NelsonMore...
DCP's unique compression algorithm, the GCA, achieves significantly higher compression ratios than Stac Electronics' LZS--typically 20% to 80% better. This difference is only a total of tens to hundreds of dollars for storage situations, but it can save hundreds of dollars a month on a leased communication link.
Created: 07/11/1999
by Mark NelsonMore...
Some folks at Loughborough U. are working on attempts to integrate data compression more closely with computer hardware. This page has reports on their progress, as well as links to some of their papers.
Created: 07/11/1999
by Mark NelsonMore...
Our thesis is that high compression efficiency for text and images can be obtained by using sophisticated statistical compression techniques, and that greatly increased speed can be achieved at only a small cost in compression efficiency.
Complete paper is included in PS format.
Created: 07/11/1999
by Mark NelsonMore...
DATA COMPRESSION PROGRAM for VM/ESA enables VM customers to automatially (sic) and transparently compress and expand CMS minidisk file data. This capability can help reduce DASD utilization, load on the I/O subsystem, and staff time spent managing minidisk space and "disk full" conditions.
Includes WaveVideo, PPMZ, LZP, and WaveCode. Charles has source for most of this stuff available elsewhere on his page.
Created: 04/11/1999
by Mark NelsonMore...
Ross Williams did some seminal work in the area of dictionary based encoders in the late 1980s and early 1990s. His LZRW algorithms were not only innovative and interesting, but they managed to place Ross right in the middle of some early software patent issues.
Created: 21/09/1999
by Mark NelsonMore...
By Ross Williams, 1991. A description of a lossless algorithm invented by Ross Williams. The algorithm is based on LZW compression with the addition of a Markov-like prediction engine. Maybe.
Created: 24/12/1998
by Mark NelsonMore...
This Wikipedia entry describes lossless data compression, includes a short explanation of the famous counting argument, which proves that any compressor cannot losslessly compress all files.
Created: 01/01/1970
by Mark NelsonMore...
