Author Page
MELP at 2.4Kbps
Source code and documentation of some nice low bit rate speech coding.
IFS - Fractal Image Compression
This page offers a program called the IFS Application Framework, a freeware program that does fractal image coding, along with some docs. The author of the page puts it this way: We use insanely complicated mathematics to achieve big compression ratios.
A faster way to downscale during JPEG decoding to a fourth
A paper by Stefan Kuhr describing a technique that he developed. It improves performance when decoing using the IJG library.
Huffman codes and Fibonacci numbers by Alex Vinokur
A careful analysis of degenerate Huffman trees created when input counts follow a Fibonacci sequence, by Alex Vinokur. This post is from sci.math.
WinAce 2.11
WinAce released a new version of their archiving program at the end of 2000, promising exciting new features, such as support for Gzipped files, proprietary EXE, sound, and picture algorithms, and the usual list of extras.
DCL user comment: I have never seen such a lovely archiving program. The best I have used so far. Winzip […]
PPM: one step to practicality
by Dmitry Shkarin. Dmitry is the author of PPMd, a well know compressor. PPM is a powerful compression technology which has a reputation for being resource intensive. In this paper Dmitry adds bells and whistles to basic PPM and gets fantastic results.
Reader jcp said: Big problem: algorithm very slow, it’s impractical to search anything inside […]
JBIG files
Here you will find information and tools related to the JBIG
arithmetic lossless bi-level image compression algorithm.
This includes the JBIG kit, which is a free C lossless image compresion library that conforms to the JBIG specification.
Indeo
What was once Intel’s software now belongs to Ligos Technology. This is the home page for downloads, documentation, support, etc.
Zip Programs Can Identify Language Of Any Document
A couple of researchers from Rome have shown that adaptive compression algorithms can be used to accurately predict the language of the source text.
LEAD JPEG2000 Plugin for Adobe Photoshop
Read and write JPEG2000 files from Photoshop with this plugin.
DataCompression.info reader Eric was disappointed with this product: Their plugin’s preview mode does not work. Without it, the plugin is horribly crippled. .
http://www.leadtools.com/utilities/psplugin/PhotoShop_plug-in.htm
Jpeg2000 : Image Compression Fundamentals, Standards, and Practice
by David S. Taubman, Michael W. Marcellin. This rather pricey book is listed as a reference for engineers and researchers who want to understand the JPEG2000 standard. Taubman is the author of the Kakadu tools, which are included on the CD (licensing terms unknown.) Use the link on this web page to buy the book […]
http://www.amazon.com/exec/obidos/ASIN/079237519X/theinternetdatac
A Known Plaintext Attack on the PKZIP Stream Cipher
A paper describing a way to brute-force ones way through PKZip’s encryption - requires a few hundred bytes of known plaintext.
Cringely on Coding
Bob X. Cringely says that a new coding technique would give us a 10X bandwidth improvement on cable lines.
QLFC - Quantized Local Frequency Coding
Florin Ghido has developed a BWT archiver, here for the taking. I believe this is free.
The JPEG 2000 Standard
A presentation by Michael J. Gormish & Michael W. Marcellin, which was given at the DCC in 2000. Lots of information and figures, but as always, the slides without the talk leaves one wanting more.
http://www.rii.ricoh.com/~gormish/pdf/dcc2000_jpeg2000_joint_charts.pdf
An Overview of JPEG-2000
A paper by Michael W. Marcellin, Michael J. Gormish, Ali Bilgin, Martin P. Boliek that was published in the 2000 Proceedings of the DCC. Good information of only moderate complexity in an academic format.
http://www.rii.ricoh.com/~gormish/pdf/dcc2000_jpeg2000_note.pdf
JPEG 2000: Worth the Wait?
A paper by Michael J. Gormish from Ricoh in Silicon Valley. History, rationale, results, and procedures.
http://www.rii.ricoh.com/~gormish/pdf/mwscs99_j2k_worthwait.pdf
Adaron Zip Portal 1.56
Yet another Zip/Archiving program tailored to the Win32 environment. Drag and Drop, XP-style icons, etc.
Wikipedia entry: H.263
This Wikipedia entry describes the H.263 video compression standard. A short entry but it has a few valuable outside links.
IETF AVT Working Group
This is the home page for the IETF group that reviews RTP packetization standards. Links on this page for all the drafts you can imagine for sending video and audio over RTP streams.
RFC 2190 - RTP Payload Format for H.263 Video Streams
The IETF standard for delivering H.263 in RTP packet streams.
RFC 2429 - RTP Payload Format for H.263+ Video Streams
The second generation fo H.263 is working on supplanting the original. Naturally, we need a standard for sending H.263v2 packets over RTP streams.
Video Demystified
This book promises to tell you everything you need to know about video, which includes pertinent compression issues: H.261, H.263, MPEG-1, MPEG-2, and other video formats. Please use
this link to purchase the book through Amazon.com. Your purchase will help support this web site.
OpenH263 Software Implementation
The open source project to create an H.263 codec. No output yet!
ITU Standard : H.263
Links to the various parts of the H.263 standard on the ITU page. Get out your credit card if you want a copy - the ITU doesn’t give things away!
http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=T-REC-H.263
Wikipedia entry: Information Theory
The Wikipedia entry for Information Theory. The basic “Claude Shannon invented all this stuff” overview.
Wikipedia entry: Linear Predictive Coding
The Wikipedia talks about LPC. A very short definition.
Wikipedia entry: Gzip
The Wikipedia entry for Gzip. Very short with just a couple of links.
Wikipedia entry: Speech Coding
The Wikipedia article on speech coding. A very few good definitions, and a very few good links.
Wikipedia Entry: Algorithmic Information Theory
The Wikipedia entry for Algorithmic Information Theory. Explains the field of study that includes such interesting things as Kolmogorov complexity.
