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Artera Turbo
These guys describe their product as Virtual Broadband, implying that it speeds up your dialup connection to the point that you can’t believe it’s not broadband! It appears that the product routes requests for web pages through their network, sending you to pages that have been compressed using their proprietary techniques.
User Paul was quite pleased […]
Data Compression Conferences
Jürgen Abel is now tracking conferences which will be covering data compression topics. This listing includes the conference, dates, web page, and submission deadline. You are encouraged to keep Jürgen updated with any new information.
Recommendation for Space Data Systems Standards
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 […]
Audio and Video Formats
PC Magazine used a jury to compare the codecs used in several popular media players, with interesting results.
David Scott’s Bijective LZW Compression Methods
David describes his work creating a bijective LZW compressor. (See this and other pages of David for details on what he means by bijective.) The page includes C++ source.
VisioWave
VisioWave is offering simple, modular, integrated and open-ended high-quality and reliable hardware and software solutions for compression, processing and real-time transmission of very high quality video over any network (IP, ATM, ADSL, cable, wireless, …).
LOCO-I/JPEG-LS Software Download Page
HP offers some free JPEG-LS software, including a Windows DLL, PhotoShop plugin, and reference executables good on several platforms, including Windows, Linux, Solaris, and of course, HP-UX.
One anonymous reader dissed the package with this comment: Not particularly user friendly.
C++ wrapper for Gilles Vollant’s Unzip API
DanG presents an extended yet simplified interface to querying, filtering and extracting multiple files from a zip archive.
AudioCodingWiki
A nice set of links to AudioCoding information. Since this is a Wiki site, it is highly collaborative - registered users can provide updates and modifications to the site at will. (I think.)
Motion Wavelets Video
MotionWavelets is a software video codec that delivers real-time, high-quality video compression to the PC-based digital video user. Powered by a wavelet-based compression engine optimized for MMX processors, MotionWavelets compresses 640×480, 30 frames per second video with VHS quality, in real time on a PII/450MHz PC. MotionWavelets will compress greater than 60 fps […]
http://www.aware.com/products/compression/motionwavelets.htm
Master Creative Software
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.
mgzip
mgzip is a program that makes use of SMP machines and zlib to use as many processors as you have to quickly compress files into gzip compatible format. mgzip only compresses; gunzip must be used to uncompress the resultant file. I have been able to compress files three times faster than standard gzip on […]
Compressed Postscript Documents - FAQ
A Technical Documentation bulleting from TI that answers the question “What is a Compressed Postscript (.psz) File?”
WSQ by Aware
WSQ by Aware is our implementation of the Federal Bureau of Investigation’s Wavelet Scalar Quantization fingerprint compression standard. WSQ by Aware is the industry’s highest performing implementation of the FBI’s Wavelet Scalar Quantization (WSQ) digital fingerprint compression algorithm. WSQ is a wavelet transform-based compression standard, developed by the FBI for compression of digital fingerprint images.
BitJazz
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.
Compression via Arithmetic Coding in Java
Bob Carpenter has created a nice Java package that implements a PPM/arithmetic coding compression system. This page includes links to the source code, javadocs, and a fair amount of tutorial material. Very complete!
bwtzip: A Linear-Time Portable Research-Grade Universal Data Compressor
bwtzip is an ongoing project, distributed under the GNU General Public License, to implement a Burrows-Wheeler compressor in standard, portable C++. It is research-grade in that it is highly modularized and abstracted, so that it is simple to swap out parts of the compressor without affecting anything else. This makes it easy to experiment with […]
MyPhotoZip
These guys are claiming a quantum leap in image compression! It looks like you can get a 30 day free trial of this product. The affiliate marketing program for MyPhotoZip is kind of goofy, see more about it at ecomecom.net.
Visitor Tim A had this to say: A demo of MyPhotoZip is available on CNET, ZDNet […]
UnZip-Ada
A pure Ada decompression library. You can extract files from zip archives using this library, although you can’t create them.
Release 11 shipped in November of 2002.
CGZip, a C++ wrapper for gzip methods
This wrapper class provides you with simple access to the gzip compression methods in zlib. You can compress and decopress to/from memory (including strings) to files. Looks promising. Release 1.1 was released 12/2002, although I can’t tell what if anything has changed.
Jürgen Abel
Jürgen is the proprietor of
www.data-compression.info,
an excellent resource for developers and researchers. Jürgen has a good supply of links to papers, conferences, books, etc. on the site, as well as executables and source for ABC, a freeware BWT compressor he wote in Delphi.
Will’s Huffman Demo
Will McKee wrote some Huffman code in C++. Take a look.
Update: Will reports that he has improved the documentation in this package, as well as adding a new function.
McKee’s Directed Acyclic Graph Compression
Will McKee has released this as freeware - includes complete source to a string substitution compressor. From the description it sounds as though it’s variant on LZSS, but I’ll defer to anyone willing to do a real analysis.
Nellymoser
Nellymoser is the leading provider of proprietary speech and audio software technology and solutions in the areas of compression, modification, synchronization and conversion. Our products improve speech and audio quality and efficiency in bandwidth-constrained environments while creating more immersive, interactive environments for your applications and services.
Asao
The Asao libraries from Nellysoft have been designed specifically to address the need for a very small footprint, low bandwidth speech and audio compression. Asao will operate at a variety of bit rates (12/16/24/32 Kbps). This new technology can be rapidly harnessed for applications such as streaming over mobile data networks, Internet radio and […]
http://www.nellymoser.com/products/audio_compression_asao_fst.htm
Sase
The Sase libraries fron Nellysoft offer flexible compression options for both embedded and data packets based compression implementations It can operate in either a single bit rate or a multi-rate mode, offering compression rates (1.8/3.2/6.4 Kbps) to suit your application or the changing environment of packet based networks. Sase has the ability to switch bit […]
David’ Scott’s Bijectified Vitter Adaptive Compression
David Scott presents an implementation of Vitter’s dynamic Huffman compressor, adapted so that it is bijective. Don’t know what bijective means? Check out David’s home page for more details.
SQX Archiver!
The folks at SpeedProject in Germany have created a developer’s toolkit that gives you full access to the SQX format archives created by their Squeez and SpeedCommander utilities. The toolkit and DLLs are completely free.
BWTCoder: Industrial strength BWT compression
This is a preliminary shot at creating an open source BWT compression engine. Things look very preliminary at this point with just a couple of files available for download and not much message traffic.
Google - Compression Test Images
Google’s directory entry point for test images used in data compression.
http://directory.google.com/Top/Computers/Algorithms/Compression/Test_Images/
