
	Where results make sense

Topic: Lossless compression

Related Topics

Lossy data compression

Holographic Versatile Disc

	Lossless data compression -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-07)
		Lossless data compression is a class of (Click link for more info and facts about data compression) data compression (A precise rule (or set of rules) specifying how to solve some problem) algorithms that allows the original data to be reconstructed exactly from the compressed data.
		Lossless compression is used when it is important that the original and the decompressed data are exactly identical, or when no assumption can be made on whether certain deviation is uncritical.
		Lossless compression methods may be categorized according to the type of data they are designed to compress.
	www.absoluteastronomy.com /encyclopedia/l/lo/lossless_data_compression.htm (1167 words)

	[1.0] Introduction / Lossless Data Compression (Site not responding. Last check: 2007-10-07)
		Lossless data compression is used when the data has to be uncompressed exactly as it was before compression.
		Lossless compression ratios are generally in the range of 2:1 to 8:1.
		Of course, the compression software must be smart enough not to compress strings of two or three repeated characters, since for three characters run length encoding would have no advantage, and for two it would actually increase the size of the output file.
	www.vectorsite.net /ttdcmp1.html (5166 words)

	Articles - Lossless data compression (Site not responding. Last check: 2007-10-07)
		Lossless data compression is a class of data compression algorithms that allows the exact original data to be reconstructed from the compressed data.
		Lossless compression is used when it is important that the original and the decompressed data be identical, or when no assumption can be made on whether certain deviation is uncritical.
		Good compression algorithms make shorter output files from the actual real-world files that are fed into it, even though there may theoretically exist a far greater number of files that it makes longer.
	www.digital-voicerecorders.net /articles/Lossless_data_compression (967 words)

	Maximum Compression (lossless data compression software)
		Compression ratio of WinRK 2.1 build 6 is almost identical to build 4, so WinRK still takes first place in the Single File Compression testset.
		In the multiple file compression section there now is a ranking based on efficiency of the compressors (please note there is still a lot of work to do here, like testing other programs, improving layout etc...).
		Compression of Ocamyd 1.63 is almost identical to 1.62 except for the BMP test, which is a few Kb smaller.
	www.maximumcompression.com (4735 words)

	SoftSound Ltd. (Site not responding. Last check: 2007-10-07)
		It is fast and has low memory usage and thus is suitable for stand alone or embedded operation for a wide range of audio-like signals.
		Typically a factor of two compression is obtained for 16 bit audio.
		lossy: The compression may be specified either in terms of an average number of bits per sample, or in terms of an acceptable (perceptually weighted) signal to noise ratio.
	www.softsound.com /Shorten.html (123 words)

	lossless and lossy compression - a Whatis.com definition - see also: lossy, lossless, lossy compression, lossless ... (Site not responding. Last check: 2007-10-07)
		Lossless and lossy compression are terms that describe whether or not, in the compression of a file, all original data can be recovered when the file is uncompressed.
		With lossless compression, every single bit of data that was originally in the file remains after the file is uncompressed.
		Lossy compression is generally used for video and sound, where a certain amount of information loss will not be detected by most users.
	whatis.techtarget.com /definition/0,,sid9_gci214453,00.html (256 words)

	LPAC - Lossless Predictive Audio Compression (Site not responding. Last check: 2007-10-07)
		"Lossless" means that any compressed file can be decompressed in a way it will be bit-wise identical with the original.
		To play compressed files directly there is a LPAC plug-in for Winamp.
		They are supplied for people interested in audio compression and may be used by anyone for a noncommercial purpose.
	www.nue.tu-berlin.de /wer/liebchen/lpac.html (1705 words)

	DataCompression.info - Lossless Compression (Site not responding. Last check: 2007-10-07)
		This category covers lossless compression methods that can't be pinned down to one of the more refined topics, such as LZW or Zip.
		CODEC uses proprietary lossless compression, and is ported to a wide variety of platforms.
		Like other lossless compression schemes the data reduction varies with the source, but it is generally between 25% and 50% for typical popular music and somewhat better than that for classical music and other sources with greater dynamic range.
	datacompression.info /Lossless.shtml (7119 words)

	Lossless audio compression
		Compression of these 6 second samples will no-doubt produce different ratios then compressing the entire file, due to variations in the sound signal from moment to moment.
		Compressing one section of a test file (03CC.wav) he found that the Windows and Macintosh file sizes were 57.03% and 56.50% respectively.
		There is a test there on lossless compression of 8 bit audio files, but I am really only interested in 16 bit stereo files, which are a very different thing.
	www.firstpr.com.au /audiocomp/lossless (8593 words)

	Lossless Data Compression Program: Hybrid LZ77 RLE
		Lossless compression algorithms are able to exactly reproduce the original contents unlike lossy compression, which omits details that are not important or perceivable by human sensory system.
		It may be advantageous to compress a string as two shorter matches instead of one long match and a bunch of literal bytes, and it can be better to compress a string as a literal byte and a long match instead of two shorter matches.
		Some other data compression algorithms use a value (using variable-length code) that indicates the number of literal bytes that follow, but this is really analogous to a prefix bit, because 1-byte uncompressed data is very common for modestly compressible files.
	www.cs.tut.fi /~albert/Dev/pucrunch (13312 words)

	Tech Report: HPL-1999-144: Lossless Compression of Digital
		Abstract: The first part of this paper surveys and classifies the best performing currently available lossless compression algorithms for stereo-CD-quality digital audio signals sampled at 44.1 kHz and quantized to 16 bits.
		This study finds that these algorithms appear to have reached a limit in compression that is very modest compared to what can be achieved with lossy audio coding technology.
		This new lossless compression algorithm uses only a small number of integer arithmetic operations and performs as well, or better than most state-of-the-art lossless compression algorithms.
	www.hpl.hp.com /techreports/1999/HPL-1999-144.html (282 words)

	Lossless Image Compression (Site not responding. Last check: 2007-10-07)
		The goals of the lossless image data compression are presented.
		Lossless image compression model is defined, serving as a framework for classification of lossless image compression techniques.
		Elements of information theory related to the evaluation of data compression algorithms are introduced.
	www.cs.technion.ac.il /Labs/Isl/Project/Projects_done/VisionClasses/DIP/Lossless_Compression/lossless.html (66 words)

	Lossless Data Compression
		The main objective of this page is to introduce two important lossless compression algorithms: Huffman Coding and Lempel-Ziv Coding.
		Huffman codes are optimal in the sense that no other lossless fixed-to-variable length code has a lower average rate.
		In practice, the Lempel-Ziv algorithm works well (lead to actual compression) only when the input data is sufficiently large and there are sufficient redundancy in the data.
	www.data-compression.com /lossless.html (932 words)

	The Art Of Lossless Data Compression http://go.to/artest
		ERI currently holds the world record for lossless compression of the most popular set of True Colour (24-bit) images.
		These 24 images, compressed with ERI to 8,891,702 bytes, are here and here.
		If one switch "-3h13" is used for all 24 files, they are compressed by ERI 5.1fre to 9,062,479 bytes.
	geocities.com /eri32/kodak.html (181 words)

	bzip2 : Home (Site not responding. Last check: 2007-10-07)
		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.
		If you are trying to restore compressed data from a backup tape or disk, and that data contains some errors, bzip2 may still be able to decompress those parts of the file which are undamaged.
		You can use the library in your own programs, to directly read and write.bz2 files, or even just to compress data in memory using the bzip2 algorithms.
	sources.redhat.com /bzip2 (320 words)

	Digital Systems Research Center: Report 124 (Site not responding. Last check: 2007-10-07)
		We describe a block-sorting, lossless data compression algorithm, and our implementation of that algorithm.
		The transformation does not itself compress the data, but reorders it to make it easy to compress with simple algorithms such as move-to-front coding.
		The size of the input block must be large (a few kilobytes) to achieve good compression.
	gatekeeper.dec.com /pub/DEC/SRC/research-reports/abstracts/src-rr-124.html (135 words)

	JBIG-KIT lossless image compression library (Site not responding. Last check: 2007-10-07)
		JBIG (Joint Bi-level Image experts Group) is the committee that developed this international standard for the lossless compression of images through arithmetic coding.
		About 2 times better compression on typical 300 dpi documents compared to “gzip -9” on raw bitmaps.
		Even much better competitive compression results on computer generated images, which are free of scanning distortions.
	www.cl.cam.ac.uk /~mgk25/jbigkit (885 words)

	Library Papers (Site not responding. Last check: 2007-10-07)
		This paper was in turn a subset of the landmark paper 'Coding Methods for High-Resolution Recording Systems' presented at AES, New York in 1997 - copies of which can be obtained from AES as preprint #4639.
		MLP Lossless Compression by Bob Stuart et al.
		This previously unpublished overview was a superset of the shorter paper presented to AES Japan 9th in 1999.
	www.meridian-audio.com /lib_pap.htm (188 words)

	BitJazz: SheerVideo (Site not responding. Last check: 2007-10-07)
		For native video (Y'CbCr[A]) footage, where SheerVideo's lossless video compression power averages 2.43 for 4:2:2 and 2.84 for 4:4:4, SheerVideo is the only perfect-fidelity QuickTime codec that does any compression at all.
		For CGI and digitized film (RGB[A]) content, SheerVideo's mean lossless image compression power of 2.20 makes it 20% more powerful than PNG (1.80) and 100% more powerful than Apple's Animation codec (1.05), and only 11% less powerful than the reigning champion, PhotoJazz.
		Because SheerVideo is a lossless video compression system, your images stay exactly the same as the originals, down to the pixel.
	www.bitjazz.com (1794 words)

	[16] What is the state of the art in lossless image compression?
		Most of the functionality implemented in the suite is as described in the book ``Managing Gigabytes: Compressing and Indexing Documents and Images'', I.H. Witten, A. Moffat, and T.C. Bell; Van Nostrand Reinhold, New York, 1994, ISBN 0-442-01863-0; US $54.95; call 1 (800) 544-0550 to order.
		Tested over a wide variety of image types, it was shown to be, on the average, within about 4% of the best available lossless image compression at a fraction of the complexity.
		In particular, JPEG-LS significantly outperforms FELICS and lossless JPEG Huffman at similar levels of complexity (it also outperforms lossless JPEG arithmetic, which is of significantly higher complexity).
	www.faqs.org /faqs/compression-faq/part1/section-14.html (494 words)

	The Art Of Lossless Data Compression, theory&practice, past,present&future
		The Art Of Lossless Data Compression, theory&practice, past,present&future - http://go.to/artest
		The Green Tree Of Compression Methods - A Practical Introduction To Data Compression
		Compression of Multimedia Information (Introduction, Part II) version 1.0, March 2001
	go.to /artest - http://artest1.tripod.com (137 words)

	FLAC - Free Lossless Audio Codec
		Grossly oversimplified, FLAC is similar to MP3, but lossless, meaning that audio is compressed in FLAC without any loss in quality.
		This is similar to how Zip works, except with FLAC you will get much better compression because it is designed specifically for audio, and you can play back compressed FLAC files in your favorite player (or your car or home stereo, see supported devices) just like you would an MP3 file.
		It is the first truly open and free lossless audio format.
	flac.sourceforge.net (644 words)

	hp labs : research : information theory
		The standard is based on the LOCO-I algorithm (LOw COmplexity LOssless COmpression for Images) developed at Hewlett-Packard Laboratories.
		The term "near-lossless compression" refers to a lossy algorithm for which each reconstructed image sample differs from the corresponding original image sample by not more than a pre-specified value, the (usually small) "loss." Lossless compression corresponds to loss=0.
		Comparisons with the old lossless JPEG (Huffman and arithmetic), CALIC, FELICS, and PNG can be found in the full paper.
	www.hpl.hp.com /loco (240 words)

	The Canterbury Corpus (Site not responding. Last check: 2007-10-07)
		The Canterbury Corpus is a benchmark to enable researchers to evaluate lossless compression methods.
		This site includes test files and compression test results for many research compression methods.
		Research on the corpus and compression in general (includes papers and reports in PDF format)
	corpus.canterbury.ac.nz (75 words)

	WavPack Audio Compression
		WavPack is a completely open audio compression format providing lossless, high-quality lossy, and a unique hybrid compression mode.
		This makes lossless mode ideal for archiving audio material or any other situation where quality is paramount.
		The compression ratio depends on the source material, but generally is between 30% and 70%.
	www.wavpack.com (485 words)

	Archive Comparison Test and PBZIP2 (by Jeff Gilchrist) (Site not responding. Last check: 2007-10-07)
		It contains benchmarks on various types of data for compression speed, uncompression speed, and compression ratio.
		Parallel BZIP2 (PBZIP2) is an open-source parallel implementation of the bzip2 block-sorting file compressor that uses pthreads and achieves near-linear speedup on SMP machines.
		The output of this version is fully compatible with bzip2 v1.0.2 (ie: anything compressed with pbzip2 can be decompressed with bzip2).
	compression.ca (110 words)

	Pegasus Imaging \| Imaging Toolkits and SDKs \| Image Compression and Editing \| JPEG
		Pegasus Imaging offers superior imaging technology, powerful digital imaging components and optimized image compression SDKs for application development.
		A full suite of document imaging toolkits, medical image compression SDKs, color / photo editing and compression libraries, and video codecs provide advanced technology designed to enhance imaging software solutions.
		Fully functional trial downloads and customer-acclaimed support allow you to be certain your requirements will be met before purchase.
	www.pegasusimaging.com (90 words)

	Comtech AHA - Hardware and IP core solutions for Lossless Data Compression, Turbo Product Codes and Forward Error ...
		A worldwide technology leader in Forward Error Correction and Lossless Data Compression solutions, Comtech AHA Corporation is winning the race to reduce the stress of bandwidth demands in data communications.
		And to reduce data size and transmission time, AHA also produces Lossless Data Compression hardware using ALDC, GZIP, and StarLite algorithms.
		AHA's lossless data compression products are used in tape data storage, printers, copiers and color scanner systems.
	www.aha.com (225 words)

	Monkey's Audio - a fast and powerful lossless audio compressor
		Efficient (fast and great compression) — Monkey's Audio is highly optimized and highly efficient
		Monkey’s Audio is a fast and easy way to compress digital music.
		Unlike traditional methods such as mp3, ogg, or lqt that permanently discard quality to save space, Monkey’s Audio only makes perfect, bit-for-bit copies of your music.
	www.monkeysaudio.com (307 words)

	Nvidia rolls out GeForce 6800 \| The Register
		That includes the ability to deal with multiple render targets in memory.
		Version 3.0 of Nvidia's own Intellisample system provides 16x anisotropic filtering and lossless compression for colour, texture and z-buffer data to speed it through the pipeline.
		Nvidia also redesigned the texture engine to allow up to 16 textures to be applied per rendering pass.
	www.theregister.co.uk /2004/04/14/nvidia_6800 (417 words)

Try your search on: Qwika (all wikis)