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Topic: JBIG

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	Welcome to JBIG
		If you are a member of the JBIG committee (see 'how to join JBIG') and you wish to enter the private Web site, please click on the 'members' button on the left.
		JBIG is short for the 'Joint Bi-level Image experts Group'.
		JBIG have developed IS 11544 (ITU-T T.82) for the lossless compression of a bi-level image.
	www.jbig.org /jbig/index.html (247 words)

	What is JBIG? - a definition from Whatis.com - see also: JBIG2, Joint Bi-level Image Experts Group
		JBIG (Joint Bi-level Image Experts Group) is a group of experts that is producing standards for bi-level image coding.
		Officially, JBIG is the ISO/IEC JTC1 SC29 Working Group 1, which is also responsible for the JPEG standard for a suite of compression algorithms used to produce image files that are supported by Web browsers and typically used for complex images such as photographs.
		JBIG has produced a standard for the compression of a bi-level image -- an image in which only one bit is used to express the color value of each pixel.
	whatis.techtarget.com /definition/0,,sid9_gci840713,00.html (242 words)

	The JPEG committee home page
		Welcome to the official site of the Joint Photographic Experts Group, JPEG, and Joint Bi-level Image experts Group, JBIG.
		As well as our members' site, it offers other useful sources of information about the JPEG and JBIG committees and their standards.
		Press release from 43rd JPEG meeting, Kobe, Japan
	www.jpeg.org (103 words)

	Definition: JBIG (Joint Bi-level Image Experts Group) [Web and XML Glossary]
		JBIG is an Image Compression standard that is mainly intended as an improvement of ITU's G3 Fax and G4 Fax recommendations for facsimile transmission.
		JBIG only defines an Image Compression, not an Image Format.
		JBIG compressed data is often stored in TIFF files.
	dret.net /glossary/jbig (192 words)

	JBIG
		Anyway, the intent of JBIG is to replace the current, less effective group 3 and 4 fax algorithms.
		JBIG will be a lossless image compression standard: all bits in your images before and after compression and decompression will be exactly the same.
		JBIG defines two kinds of context, one for the lowest resolution layer (the base layer), and one for all other layers (differential layers).
	www.mcs.csuhayward.edu /~grewe/CS6825/Mat/Compression/JBIG.htm (1364 words)

	The IBM JBIG-ABIC Verification Suite
		JBIG is the Joint Bi-level Image Experts Group [1] image compression standard, and ABIC is the IBM Adaptive Bilevel Image Compression [2] standard.
		In JBIG sequential mode, one of the parameters is not used, and five of the parameters are always set to 0.
		Because the JBIG decode algorithm requires all of the encoded data to be decoded to the full image dimensions, the ABORT marker is useful when the encoded data become unavailable (i.e., a dropped transmission line, a failed retrieval system, corrupted encoded data, or other system failure).
	www.research.ibm.com /journal/rd/426/colyer.html (4255 words)

	JBIG Compression
		JBIG is intended to completely replace the less efficient MR (Modified READ) and MMR (Modified Modified READ) compression algorithms used by the CCITT Group 3 (G3) and Group 4 (G4) data transmission protocols, respectively.
		JBIG encodes redundant image data by comparing a pixel in a scan line with a set of pixels already scanned by the encoder.
		JBIG has been found to produce better compression results than lossless JPEG (using the Q-coder) on images with two to five bits per pixel and to produce identical results on image data with pixels six to eight bits in depth.
	netghost.narod.ru /gff/graphics/book/ch09_07.htm (1723 words)

	[74] Introduction to JBIG
		JBIG software and the JBIG specification are available in ftp://nic.funet.fi/pub/graphics/misc/test-images/jbig.tar.gz The ISO JBIG committee's home page is http://www.jpeg.org/public/welcome.htm A short introduction to JBIG, written by Mark Adler : JBIG losslessly compresses binary (one-bit/pixel) images.
		Another introduction to JBIG, written by Hank van Bekkem : The following description of the JBIG algorithm is derived from experiences with a software implementation I wrote following the specifications in the revision 4.1 draft of September 16, 1991.
		JBIG defines two kinds of context, one for the lowest resolution layer (the base layer), and one for all other layers (differential layers).
	www.faqs.org /faqs/compression-faq/part2/section-5.html (1453 words)

	LEADTOOLS JBIG Module is an add-on for LEADTOOLS that defines lossless compression encoding
		JBIG defines a method for lossless compression encoding of a bi-level image (that is, an image that, like a fl-and-white image, has only two colors).
		JBIG is sensitive to noise, the compression ratio decreases when the amount of noise in your image increases.
		JBIG produces better results than lossless JPEG on images with two to five bits per pixel and produce identical results on image with data six to eight pixels.
	www.hallogram.com /leadjbig/index.html (521 words)

	[No title]
		JBIG is a highly effective lossless compression algorithm for bi-level images (one bit per pixel), which is particu- larly suitable for scanned document pages.
		JBIG files can also store several bits per pixel as separate bitmap planes, and pbmtojbg can read a PGM file and transform it into a multi-bitplane BIE.
		The JBIG encoder uses a number of neighbour pixels in order to get statistical a priori knowledge of the probability, whether the next pixel will be fl or white.
	www.uni-koeln.de /rrzk/software/grafik/imageprocessing/jbig/pbmtojbg.txt (1196 words)

	A JBIG-ABIC compression engine for digital document processing
		JBIG uses a context built from ten neighboring pixels of the current pixel being examined.
		JBIG provides more capability for tuning the template of the model unit to particular images and has a higher-resolution probability estimation, both of which can help to improve the compression ratio.
		JBIG data streams are handled by inverting the code on its way out for compression and on the way in for decompression, as described in the companion paper [5] by Slattery and Mitchell in this issue.
	www.research.ibm.com /journal/rd/426/marks.html (2117 words)

	JBIG Biography on DanceAge
		JBIG is a lossless image compression standard from the Joint Bi-level Image Experts Group, standardized as ISO/IEC standard 11544 and as ITU-T recommendation T.82.
		JBIG was designed for compression of binary images, particularly for faxes, but can also be used on other images.
		JBIG uses a form of arithmetic coding patented by IBM known as the Q-coder.
	www.danceage.com /biography/sdmc_JBIG (250 words)

	[No title]
		JBIG is a highly effective lossless compression algorithm for bi-level images (one bit per pixel), which is particularly suitable for scanned document pages.
		JBIG files can also store several bits per pixel as separate bitmap planes, and pnmtojbig can read a PGM file and transform it into a multi-bitplane BIE.
		JBIG separates an image into several horizontal stripes, resolution layers and planes, were each plane contains one bit per pixel.
	www.terra.es /personal/malfer/netpbm/html/man1/pnmtojbig.html (1256 words)

	JBIG Compression
		JBIG is intended to completely replace the less efficient MR (Modified READ) and MMR (Modified Modified READ) compression algorithms used by the CCITT Group 3 (G3) and Group 4 (G4) data transmission protocols, respectively.
		JBIG encodes redundant image data by comparing a pixel in a scan line with a set of pixels already scanned by the encoder.
		JBIG has been found to produce better compression results than lossless JPEG (using the Q-coder) on images with two to five bits per pixel and to produce identical results on image data with pixels six to eight bits in depth.
	www.fileformat.info /mirror/egff/ch09_07.htm (1733 words)

	[No title]
		For the purpose of browsing document images, JBIG compression was found to be the most applicable current technology, and is the compression being used right now in the Just-in-time Browsing research.
		By applying the JBIG algorithm to multiple bit planes of grayscale images, we will be able to preserve the grayscale information that is important for browsing some images.
		Changes to JBIG Compression - Since a reset of the arithmetic encoder is required after each stripe, there is a slight loss in compression during the encoding of images.
	rivit.cs.byu.edu /kennard.html (802 words)

	Handbook:Advanced Server Configuration:JPEG and JBIG Faxing - hylafax.org
		The usage of JPEG and JBIG compression schemes are generally considered "advanced" fax features and may not be available to all fax machines.
		JBIG compression is most commonly used for sending and receiving monochrome facsimile, but with a tighter compression (and thus faster send-times) than MMR.
		JBIG send support does not require libtiff to be patched.
	www.hylafax.org /content/Handbook:Advanced_Server_Configuration:JPEG_and_JBIG_Faxing (617 words)

	Joint Bi-level Image Experts Group from FOLDOC
		JBIG can handle images with from one to 255 bits per pixel.
		JBIG uses discrete steps of detail by successively doubling the resolution.
		Compared to CCITT Group 4, JBIG is approximately 10% to 50% better on text and line art, and even better on halftones.
	ftp.sunet.se /foldoc/foldoc.cgi?JBIG (675 words)

	Using the JBIG-KIT library
		Resolution layers are numbered from 0 to D with 0 being the lowest resolution layer and D the highest one.
		It is possible to use the raw BIE data stream as specified by the JBIG standard directly as the format of a file used for storing images.
		Some people in the JBIG committee seem to have argued that using only 2 lines will make software implementations a little bit faster, however others have argued that using only two lines will decrease compression efficiency by around 5%.
	www4.informatik.uni-erlangen.de /Services/Doc/graphics/doc/jbig (3729 words)

	Pnmtojbig User Manual
		JBIG files can also store several bits per pixel as separate bitmap planes, and pnmtojbig can read a PGM file and transform it into a multi-bitplane BIE.
		It is possible to store the various resolution layers of a JBIG image in progressive mode into different BIEs.
		JBIG separates an image into several horizontal stripes, resolution layers and planes, were each plane contains one bit per pixel.
	netpbm.sourceforge.net /doc/pnmtojbig.html (1222 words)

	[No title]
		The.I JBIG encoder uses a number of neighbour pixels in order to get statistical a priori knowledge of the probability, whether the next pixel will be fl or white.
		The order of the SDEs is only relevant for applications that want to decode a.I JBIG file which has not yet completely arrived from e.g.
		For instance some applications prefer that the outermost of the three loops (stripes, layers, planes) is over all layers so that all data of the lowest resolution layer is transmitted first.
	web.mit.edu /windows-graphics/man/man1/pnmtojbig.1 (1317 words)

	JBIG Compression - LEADTOOLS' JBIG Compression in an SDK (Site not responding. Last check: )
		The Adaptive Arithmetic Encoder, which presents the heart of this format, has the ability to predict and hence encode future data symbols based on the data which is being currently encoded.
		JBIG is an acronym for 'Joint Bi-level Image experts Group'.
		The JBIG group has developed IS 11544 (ITU-T T.82) standard for the lossless compression of a bi-level image.
	www.leadtools.com /SDK/Raster/Raster-Compression-JBIG.htm (467 words)

	Literature search on bi-level image compression
		In this paper, we present an improvement on the context modeling scheme by adapting the context template to the periodic structure of the classical halftone image.
		For classical halftones, the global improvement with respect to JBIG in its best mode is about 30% to 50%; binary tree modeling increases this by another 5% to 10%.
		The global improvement with respect to JBIG (which has features like one adaptive pixel, histogram rescaling and multiresolution decomposition) is about 30% to 65%, depending on the image.
	users.ece.utexas.edu /~bevans/papers/1999/jbig2/litsearch.html (3252 words)

	JBIG Compression - JBIG File Format Support Available from LEAD Technologies (Site not responding. Last check: )
		JBIG is more effective than other bitonal algorithms with compression ratios between 1.1 and 1.5 times as great as those provided by the CCITT Groups 3 and 4 fax encodings.
		JBIG includes a progressive coding scheme that transmits a compressed image by first sending the compressed data for a reduced resolution version and then enhancing the data as needed by transmitting compressed data that builds on that already transmitted.
		Rich Little, president of LEAD states, "Our JBIG support is in reaction to document imaging developer requests for a level of compression that will allow greater storage capacity for paper based documents.
	www.leadtools.com /Home2/press/jbigpress.htm (422 words)

	rfc2879
		The 'JBIG-stripe-size' feature may be used with JBIG image coding, and indicates the number of scan lines in each stripe except the last in an image.
		A stripe of a JBIG image is a delimited horizontal band of compressed image data that can be decompressed separately from the surrounding data.
		It may be used with JBIG images (image-coding=JBIG) to indicate color plane interleaving of either stripes or entire image planes.
	ietfreport.isoc.org /idref/rfc2879 (6652 words)

	ComputerBase - Lexikon: JBIG (Site not responding. Last check: )
		JBIG ist ein Standard für ein verlustfreies Kompressionsverfahren von digitalen Bildern.
		JBIG wurde speziell für Binärbilder wie z.B. Faxe entwickelt, kann aber auch für andere Bilder verwendet werden.
		JBIG unterstützt auch den progressiven Bildaufbau mit zusätzlichen Daten, die die Bilddatei um ca.
	www.computerbase.de /lexikon/JBIG (247 words)

	jbigtopnm (Site not responding. Last check: )
		JBIG is a highly effective lossless compression algorithm for bi-level images (one bit per pixel), which is particularly suitable for scanned document pages.
		A JBIG encoded image can be stored in several resolutions in one or several BIEs.
		All resolution layers except the lowest one are stored efficiently as differences to the next lower resolution layer.
	gd.tuwien.ac.at /linuxcommand.org/man_pages/jbigtopnm1.html (426 words)

	Zvon - RFC 2301 - Lossless JBIG Black-and-White Fax Mode
		Implementations of this profile are required to also implement Profile S. The previous section described the extended interchange set of TIFF fields for fl-and-white fax, which provided support for the MH, MR and MMR compression of fl-and-white images.
		JBIG compression is used in accordance with the application rules given in ITU-T Rec.
		This mode is essentially the extended fl-and-white mode with JBIG compression used instead of MH, MR or MMR.
	www.ics.uci.edu /~dan/class/267/rfc2301/chapter5.html (361 words)

	File Formats: JBIG Format (JBG) (Site not responding. Last check: )
		JBIG (JBG) is an industry standard lossless compressed file format for bi-tonal (fl and white), grayscale and color images.
		LEAD’s JBIG support is comprehensive and handles all variants flavors and bits per pixel as defined by the specification including progressive, so that you can store and send multiple representations of images at different resolutions without any extra storage overhead.
		In order to achieve highest compression ratios available by the JBIG format, LEAD also takes full advantage of all the functional blocks of this robust standard including the Adaptive Arithmetic Encoder, the Adaptive Template Block, the Typical Prediction Block, the Resolution Reduction Block, and the Deterministic Prediction Block.
	www.eprintdriver.com /help/v5.0/COM/Ocx_aux/JBGFmt.htm (180 words)

	Joint Bi-level Image Experts Group (Site not responding. Last check: )
		Their proposed algorithm features compatible progressive coding and sequential coding and is lossless - the image is unaltered after compression and decompression.
		JBIG can handle images with from one to 255 bits per pixel.
		JBIG, just like Group 4, gives worse compression in the presence of noise in images.
	www.cacs.louisiana.edu /~mgr/404/burks/foldoc/54/62.htm (666 words)

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