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	PPM compression algorithm - Wikipedia, the free encyclopedia
		PPM is an adaptive statistical data compression technique based on context modeling and prediction.
		PPM models use a set of previous symbols in the uncompressed symbol stream to predict the next symbol in the stream.
		This process is the inverse of that followed by DMC compression algorithms which build up from a zero-order model.
	en.wikipedia.org /wiki/PPM_compression_algorithm (492 words)

	Encyclopedia: PPM compression algorithm (Site not responding. Last check: 2007-10-09)
		In computer science, data compression or source coding is the process of encoding information using fewer bits (or other information-bearing units) than a more obvious representation would use, through use of specific encoding schemes.
		A dictionary coder, also sometimes known as a substitution coder, is any of a number of data compression algorithms which operate by searching for matches between the text to be compressed and a set of strings contained in a data structure (called the dictionary) maintained by the encoder.
		Lossless data compression is a class of data compression algorithms that allow the original data to be reconstructed exactly from the compressed data.
	www.nationmaster.com /encyclopedia/PPM-compression-algorithm (825 words)

	Search Encyclopedia.com
		Air is compressed, then led through chambers where its volume is increased by the heat of fuel combustion.
		tourniquet tourniquettoor´nĬkĕt, -kā, tûr´-, compression device used to cut off the flow of blood to a part of the body, most often an arm or leg.
		He is said to have given algebra its name, and the word algorithm is said to have been derived from his name.
	www.encyclopedia.com /search.asp?target=PPM+compression+algorithm&rc=10&fh=12&fr=11 (529 words)

	PPM compression algorithm
		Some PPM algorithms have the useful property of being able to interpret any collection of bytes as valid compressed input.
		An algorithm with this property is said to be bijective.
		Bijectiveness has positive implications for compression efficiency and security because there is no way to distinguish random data from valid output.
	www.sciencedaily.com /encyclopedia/ppm_compression_algorithm (565 words)

	PPM compression algorithm (Site not responding. Last check: 2007-10-09)
		PPM models use a set of previous symbols in the uncompressed symbol stream to predict the frequency ofthe next symbol in the stream.
		This process is the inverse of that followed by DMC compression algorithms which build up from a zero-ordermodel.
		An algorithm with this property issaid to be bijective.
	www.therfcc.org /ppm-compression-algorithm-217311.html (468 words)

	Read about PPM compression algorithm at WorldVillage Encyclopedia. Research PPM compression algorithm and learn about ... (Site not responding. Last check: 2007-10-09)
		DMC compression algorithms which build up from a zero-order model.
		Software implementations were not popular until the early 1990s because PPM algorithms require a significant amount of
		BICOM, a PPM compressor with the "bijective" property (http://www3.sympatico.ca/mt0000/bicom/bicom.html)
	encyclopedia.worldvillage.com /s/b/Prediction_by_partial_matching (458 words)

	Postgraduate Seminar Series - Past Seminars (2000)
		PPM (Prediction by Partial Matching) is one example of a context-based text compression.
		PPM always predicts the current symbol from the highest order and if the symbol is not found, an escape symbol will be sent and and then uses the next lower order to predict the probability of the current symbol.
		Block-sorting compression algorithm is a unique lossless approach introduced in 1994 by Burrows and Wheeler.
	www.cs.mu.oz.au /pgrad/seminars/2000.html (1671 words)

	[8] What about patents on data compression algorithms? (Site not responding. Last check: 2007-10-09)
		4,682,150 Data compression method and apparatus inventors Mathes and Protheroe, assignee NCR Corporation, Dayton OH A system and apparatus for compressing redundant and nonredundant binary data generated as part of an operation of a time and attendance terminal in which the data represents the time an employee is present during working hours.
		In the method and apparatus for compressing a stream of data symbols, a fixed length search window, comprising a predetermined contiguous portion of the symbol stream, is selected as the string to be searched by the string searcher.
		If a string to be compressed is found in the symbol stream, a code is output designating the location within the search window of the matching string and the length of the matching string.
	www.faqs.org /faqs/compression-faq/part1/section-7.html (2861 words)

	An Asymmetric, Semi-adaptive Text Compression Algorithm (ResearchIndex) (Site not responding. Last check: 2007-10-09)
		Abstract: A new heuristic for text compression via digram replacement and a new, fast entropy coding method are described and implementation results are presented.
		The resulting compression algorithm is asymmetric in the sense that compression requires much time and memory, but decompression is fast and requires little memory.
		Compression ratios achieved are competitive with gzip for a standard corpus of texts, and better for large files.
	citeseer.ist.psu.edu /153292.html (350 words)

	DataCompression.info - PPM (Site not responding. Last check: 2007-10-09)
		PPM is a specialized form of compression based on Markov modeling.
		In general, PPM predicts the probability of a given character based on a given number of characters that immediately precede it.
		PPM is a powerful compression technology which has a reputation for being resource intensive.
	datacompression.info /PPM.shtml (1805 words)

	Compression algorithm books
		Transporting Compressed Digital Video can be used as a textbook for senior undergraduate and graduate- level courses on video compression and communication, and as a reference book by communication engineers and video coding specialists.
		The volume presents a new algorithm for retrieval, which is optimal with respect to both program length and running time, and algorithms for hashing and adaptive on-line compressing.
		Moreover, data compression methods are described for developing short programs for partially specified Boolean functions, short formulas for threshold functions, identification keys, stochastic algorithms for finding the occurrence of a word in a text, and T-independent sets.
	www.algorithm-books.com /compression-algorithm-books-2.html (1176 words)

	Part 1: Compression Algorithm FAQ - Games++
		Such algorithms are claimed to compress random data and to be applicable recursively, that is, applying the compressor to the compressed output of the previous run, possibly multiple times.
		Page 27, line 18 of the patent states that the claimed method can compress without loss all files by at least one bit: the direct bit encode method of the present invention is effective for reducing an input string by one bit regardless of the bit pattern of the input string.
		Human assistance to the compression is no longer needed and the compression time is reasonable, although the more time and compute power you throw at the compression, the smaller the resulting file for the same level of quality.
	www.gamespp.com /algorithms/compressionAlgorithmFaq01.html (13412 words)

	Algorithms, line drawing algorithm, algorithm and flow chart (Site not responding. Last check: 2007-10-09)
		Genetic algorithms are a particular class of evolutionary algorithms that use...
		Comparison of four algorithms accelerating the convergence of a subset of logarithmic fixed...
		Illinois Genetic Algorithms Laboratory at the University of Illinois at Urbana-Champaign.
	www.watchcomputer.com /algorithms.html (882 words)

	PPM compression algorithm - Encyclopedia, History, Geography and Biography
		PPM compression algorithm - Encyclopedia, History, Geography and Biography
		M. Nelson (1991) Arithmetic Coding + Statistical Modeling = Data Compression (http://cotty.16x16.com/compress/nelson1.htm), Dr.
		This encyclopedia, history, geography and biography article about PPM compression algorithm contains research on
	www.arikah.net /encyclopedia/PPM_compression_algorithm (518 words)

	Data compression: the "3R" algorithm
		Using existing algorithms would be useless, as most of them operate on bytes (while histograms can contain very large numbers) and are quite complex for such a simple task.
		Here the algorithm is extended to the two-dimensional case but it conserves the property that each branch has roughly the same weight.
		I am surprised that a minor algorithm originally intended for lossless sound compression can also be used in still or moving picture compression, or as backend to other transforms like FFT or BWT (this is yet do be examined).
	www.f-cpu.org /~f-cpu/whygee/ddj-3r/ddj-3R.html (3573 words)

	XMLPPM: XML-Conscious PPM Compression (Site not responding. Last check: 2007-10-09)
		It is a combination of the well-known Prediction by Partial Match (PPM) algorithm for text compression, first described by Cleary and Witten in 1984, and an approach to modeling tree-structured data called Multiplexed Hierarchical Modeling (MHM) that I have developed.
		This size blowup carries over to compressed formats as well, that is, text-compressed XML versions are typically still larger than compressed costomized files.
		Furthermore, compression tends to introduce another "pass" into XML processing since files must be decompressed before they can be parsed and processed.
	xmlppm.sourceforge.net (384 words)

	Ppm - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-09)
		Private placement memorandum, a document typically created in conjunction with legal counsel that is used to raise venture capital
		the PPM compression algorithm used in computer science
		Pulse position modulation, a form of data transmission.
	www.encyclopedia-online.info /Ppm (118 words)

	JPEG image compression FAQ, part 1/2 (Site not responding. Last check: 2007-10-09)
		GIF has additional "LZW" compression built in, but LZW doesn't work very well on typical photographic data; at most you may get 5:1 compression overall, and it's not at all uncommon for LZW to be a net loss (i.e., less than 3:1 overall compression).
		When I say "lossless", I mean mathematically lossless: a lossless compression algorithm is one that guarantees its decompressed output is bit-for-bit identical to the original input.
		The disadvantages of MPEG are (1) it requires far more computation to generate the compressed sequence (since detecting visual similarities is hard for a computer), and (2) it's difficult to edit an MPEG sequence on a frame-by-frame basis (since each frame is intimately tied to the ones around it).
	www.faqs.org /faqs/jpeg-faq/part1 (9116 words)

	Port of PPMZ
		PPM (Prediction by Partial Match) is a classic compression algorithm.
		PPM predicts the probability of a given character based on the characters that immediately precede it.
		Canterbury Corpus is the most polular compression benchmark.
	www.cs.hut.fi /~tarhio/ppmz (299 words)

	Mitsuharu ARIMURA's Bookmarks on Source Coding/Data Compression
		Ross Arnold and Tim Bell, "A Corpus for the Evaluation of Lossless Compression Algorithms", Proc.
		Peter Fenwick, "Improvements to the Block-Sorting Text Compression Algorithm," The University of Auckland, Department of Computer Science, Technical Report 120, July 1995.
		Charles Bloom, "LZP: a new data compression algorithm," Proc.
	www.hn.is.uec.ac.jp /~arimura/compression_links.html (996 words)

	Compression and encryption algorithms
		PPM algorithm, variant G (by Dmitry Shkarin, shkarin@arstel.ru)
		Typically ZLib is the fastest algorithm, BZIP is fast and has a good rate, PPM provides the maximum rate with rather low speed.
		The most advanced users of ECL editions with source code could also tune the parameters of compression algorithms to achieve the best result for their specific tasks.
	www.componentace.com /help/ecl_guide/Compression_and_encryption_algorithms.htm (194 words)

	php-deluxe.net - description Bzip2
		In this manner it is fairly similar to other recent-generation compression algorithms.
		According to the author, bzip2 gets within ten to fifteen percent of the best class of compression algorithms currently known (PPM compression algorithm), although it is roughly twice as fast at compression and six times faster at decompression.
		In Unix, bzip2 can be used combined or independently of tar (file format): bzip2 file to compress and bzip2 -d file.bz2 to uncompress (the alias bunzip2 for decompression may also be used).
	www.php-deluxe.net /wiwimod,index.page,bzip2.htm (419 words)

	Home of unrarlib - UniquE RAR File Library - FAQ
		Compression is used to make the archive file size smaller.
		Use WinRAR v2.9 (RAR 3.0 is introducing new compression algorithms which are not implemented yet).
		It would imply problems with the GPL license (RAR3 features a PPM based compression algorithm developed by Dmitry Shkarin plus some code by Eugeny Roshal).
	www.unrarlib.org /faq.html (413 words)

	Bug#179804: PPM compression algorithms. (fwd)
		The primary algorithms in this area are PPMZ and PPMii ; there are implementations like BOA and PPMonstr that are very good, and many more.
		Prev by Date: Processed: Re: PPM compression algorithms.
		Next by thread: Processed: Re: PPM compression algorithms.
	lists.debian.org /debian-wnpp/2003/02/msg00280.html (519 words)

	A Survey of Modern File Compression Techniques (ResearchIndex) (Site not responding. Last check: 2007-10-09)
		Abstract: We review several papers to examine how compression algorithms can be best used in modern file systems to increase effective disk capacity without imposing unacceptable performance or reliability penalties.
		For each of several compression schemes, we evaluate the proposed compression policy and the successes and shortcomings of the implementation.
		Finally, we identify evolutionary trends in file compression software, and conclude that future experimentation should focus on demand-paged systems...
	citeseer.ist.psu.edu /111968.html (278 words)

	C Programming: Best compression algorithm?
		It typically compresses files to within 10% to 15% of the best available techniques (the PPM family of statistical compressors), whilst being around twice as fast at compression and six times faster at decompression.
		Note that in the blurb they mention another family of compression algorithms that may be a bit better.
		But, if it is a good implementation you're after, bzip2 is free, solid, and fast, and is becoming popular because it is shipped with a number of linux distributions and cygwin.
	www.experts-exchange.com /Programming/Programming_Languages/C/Q_20186714.html (414 words)

	Text Classification and Segmentation Using Minimum Cross-Entropy - Teahan (ResearchIndex) (Site not responding. Last check: 2007-10-09)
		These are based on ranking text sequences by their cross-entropy calculated using a fixed order character-based Markov model adapted from the PPM text compression algorithm.
		Experimental results show that the methods are a signi cant improvement over previously used methods in a number of areas.
		This paper describes the use of PPM based compression techniques for resolving the authorship attribution problem for two authors as...
	citeseer.ist.psu.edu /teahan00text.html (744 words)

	Ppm - PPM Energy - A ScottishPower Company (Site not responding. Last check: 2007-10-09)
		Marvin is able to export PPM image files.
		Plant Cell Technology, Inc. has developed a new biocide that reduces or prevents contamination in plant tissue cultures.
		PPM Energy provides marketing, balancing, scheduling and transportation PPM Energy provides marketing and development of wind and thermal energy
	publicwindow.com /pw/ppm.html (209 words)

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