Author Page
Take A HyperDrive On The Internet Super Highway
Pegasus Web Services has a new compression algorithm that they say can put 1.2GB on a floppy disk! No demo software yet, but if you’re interested in licensing the technology they are ready to talk.
Windows Media 9: Better sound, smaller files
Josh Taylor of ZDNet did a quickie informal comparison of the new Windows Media 9 format and gives it a thumbs-up.
http://www.zdnet.com/anchordesk/stories/story/0,10738,2879818,00.html
Wavelet Filter Evaluation for Image Compression
by John D. Villasenor, Benjamin Belzer, and Judy Liao. A paper discussing the choice of filter bank for wavelet compression. PS format only.
DemoGraFX to offer imaging IP cores in strategy shift
DemoGraFX Inc. is going to be selling their video compression technology to semiconductor companies and system vendors. EE Times has the scoop.
Voice Recording Applet SDK
The voice recording applet SDK is designed for the web developers and allows to record the voice from web site, to compress it and to send to the web server via HTTP. To playback the recorded voice from the server the embedded voice streaming player or a separate player as a voice streaming applet can […]
Ogg Vorbis Wins a Listening Test
This German news item reports on a test that pitched Ogg Vorbis against MP3, Window Media, AAC, and RealAudio. My Babelfish translation says In particular with 64 kBit/s Ogg Vorbis could convince and left the entire prominent competition behind itself. I think that means it won!
Free Specs from the ITU
According to Pete Fraser, you can download three free specifications from the ITU per year, after free registration. This is a great deal - these specs can run into the hundreds of dollars per copy, and if you aren’t near a university library, you may have no other way to get them.
http://groups.google.com/groups?selm=umpssdh2ls194%40news.supernews.com
LZW Patent Expiration
This thread reveals the actual dates for the LZW patent expiration, including US, European, and Japanese patents.
http://groups.google.com/groups?&threadm=a5aa8dd0.0208271613.3cd18da6%40posting.google.com
Vidfern Squeezer
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 […]
Draft ITU Standards
This directory appears to contain draft standards for H.261, H.263, and H.264.
Note: this site moved to the current ftp location as of 9/15/2002.
LAME Ain’t an Mp3 Encoder
Despite the protestations, you can use LAME to create MP3 streams. It does it with the magic of the ISO demo code. LAME isn’t lame, lots of people seem to like it.
IZArc
IZArc is a free multi-format archiver. Supports the following formats: ACE, ARC, ARJ, BH, BZ2, CAB, ENC, GZ, HA, JAR, LHA, LZH, MBF, MIM, PAK, PK3, RAR, TAR, TBZ, TGZ, UUE, XXE, Z, ZIP, ZOO. Pretty good list, wouldn’t you say?
CHAOS Self Extractor
CHAOS Self-Extractor is a utility program that creates self-extracting ZIP files for Windows. CHAOS supports a form of encryption that it claims is much stronger than standard Zip encryption.
The Zip, GZip, BZip2 and Tar Implementation For .NET
#ziplib (SharpZipLib, formerly NZipLib) is a Zip, GZip, Tar and BZip2 library written entirely in C# for the .NET platform. It is implemented as an assembly (installable in the GAC), and thus can easily be incorporated into other projects (in any .NET language). The creator of #ziplib put it this way: “I’ve ported the zip […]
http://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspx
Effective Arithmetic Coding
Sachin Garg’s article and source on arithmetic coding, includes a 64-bit implementation.
Squeez - The Ultimate Compression Utility
Squeez is a fast file compression application, supporting many different archive formats. It reads and writes files in the formats ACE, ARJ, BZIP, CAB, GZIP, LZH, RAR, SQX, TAR, UUE and ZIP without any additional software. Unlike many other archivers, Squeez can read and write ZIP files (so called Zip64 archives) that have no limits […]
ZipStar
ZipStar is a free archiving application for home users. It can create, modify and extract the archive formats SQX, CAB and ZIP. Besides the application itself, ZipStar also provides an extension for the Windows Explorer. With this extension it is possible to extract or create archives directly within Windows Explorer.
ZipStar may be used free of […]
An Implementation of EZW
A C implementation of Shapiro’s EZW algorithm. Performance is close/better than the reported results with the wavelet filters.
Wavelets and Signal Processing
Ian Kaplan’s Wavelet and Signal Processing page has lots of articles and C++/Java source code implementing wavelet transform via the lifting scheme, the integer-to-integer wavelet transform and the best basis wavelet packet transform
WinBig
A file archive utility written in VB. Compression and decompression routines are LZSS. Full source code included.
http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=29329&lngWId=1
DjVu - Next generation image compression technology
DjVu is an image compression technique that is meant to be used on scanned documents. AT&T has created a browser plugin that supports DjVu files. AT&T claims that DjVu files are 5 to 8 times smaller than GIF or JPEG images of similar quality. Some public source code is provided here, but the exciting parts […]
Compresssion Algorithms and Applications to Genetic Sequence Analysis
PhD thesis by Éric Rivals.
IEEE Transactions on Information Theory
Links to the articles from this journal dating back to 1988. If you’re not an IEEE member, you only get to see the abstracts! Membership in the IEEE plus a few extra bucks lets you download here to your heart’s content.
Update: Site has moved due to redesign.
DjVu Technical Papers
This page has a number of papers related to the DjVu compression format. Papers are all posted in ps.gz and DjVu formats. Note that you’ll need the DjVu plugin to read them in that format.
UPL Compression : the complete professional toolkit
The UPL Compression Library is a high-performance professional compression library. It offers the ability to compress and decompress data, buffers, strings or single files and features the latest innovations in data compression. The library offers eight extremely powerful compression algorithms. Dynamic Huffman, Arithmetic, BWT, Ppm and several Lempel Ziv flavors.
DataCompression.info user John G. […]
Arithmetic Coding Revisited
by Moffat, Neal, and Witten. The authors of the original CACM article on arithmetic coding take a fresh look at the topic with an additional ten years of knowledge.
http://www.cs.technion.ac.il/~ronir/courses/advancedTopics/pubs/moffat.pdf
Winimp - The Archiver for the 21st Century
WinImp has been re-released as freeware. This archiver can create Zip files, and extract from the usual list of Zip, ARJ, RAR, and so on. It includes a couple of proprietary (BWT-based?) algorithms that purport to do well on text files.
DataCompression.info user Mike notes that It includes 2 very good
compression methods and only the new […]
ZipMagic
ZipMagic gives you transparent access to Zip files via the technology from the ZipFolders product. Treat archive files as if they were ordinary folders. ZipMagic of course contains a number of other nice features.
The DICOM Standard
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.
Intel Integrated Performance Primitives
Intel has created a new library designed to deal with varous primitives used in Data Compression. Intel says: Intel® Integrated Performance Primitives (IPP) is a software library which provides a range of library functions for multimedia, audio codecs, video codecs (for example H.263, MPEG-4), image processing (JPEG), signal processing, speech compression (i.e. G.723, GSM ARM*) […]
http://developer.intel.com/software/products/ipp/ipp30/overview.htm
