JBIG is an early losslessimage compression standard from the Joint Bi-level Image Experts Group, standardized as ISO/IEC standard 11544 and as ITU-T recommendation T.82 in March 1993.[1] It is widely implemented in fax machines. Now that the newer bi-level image compression standard JBIG2 has been released, JBIG is also known as JBIG1. JBIG was designed for compression of binary images, particularly for faxes, but can also be used on other images. In most situations JBIG offers between a 20% and 50% increase in compression efficiency over Fax Group 4 compression, and in some situations, it offers a 30-fold improvement.
JBIG is based on a form of arithmetic coding developed by IBM (known as the Q-coder) that also uses a relatively minor refinement developed by Mitsubishi, resulting in what became known as the QM-coder. It bases the probability estimates for each encoded bit on the values of the previous bits and the values in previous lines of the picture. JBIG also supports progressive transmission, which generally incurs a small overhead in bit rate (around 5%).
Doubts about patent licence requirements for JBIG1 implementations by IBM, Mitsubishi and AT&T prevented the codec from being widely implemented in open-source software.[2] For example, as of 2012, none of the commonly used web browsers supported it. Since 2012, there are now no more JBIG1 patents in force – the last ones to expire were Mitsubishi's patents in Canada and Australia (on 25 February 2011) and in the United States (on 4 April 2012).[2][3]
^Akramullah, Shahriar (2014). "Video Coding Standards". Digital Video Concepts, Methods, and Metrics. Apress. pp. 55–100. doi:10.1007/978-1-4302-6713-3_3. ISBN978-1-4302-6712-6.
^"archive.ph". archive.ph. Archived from the original on 2013-02-22. Retrieved 2023-01-21.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
External linksedit
JBIG-KIT – a freeC implementation of the JBIG encoder and decoder
ISO/IEC 11544
ITU-T Recommendations T.82, T.85
RFC 2879 – Content Feature Schema for Internet Fax (V2)
RFC 3949 – File Format for Internet Fax
This graphics software–related article is a stub. You can help Wikipedia by expanding it.
jbig, this, article, about, level, image, compression, scheme, designers, joint, level, image, experts, group, early, lossless, image, compression, standard, from, joint, level, image, experts, group, standardized, standard, 11544, recommendation, march, 1993,. This article is about the bi level image compression scheme For its designers see Joint Bi level Image Experts Group JBIG is an early 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 in March 1993 1 It is widely implemented in fax machines Now that the newer bi level image compression standard JBIG2 has been released JBIG is also known as JBIG1 JBIG was designed for compression of binary images particularly for faxes but can also be used on other images In most situations JBIG offers between a 20 and 50 increase in compression efficiency over Fax Group 4 compression and in some situations it offers a 30 fold improvement JBIGFilename extension jbg jbigInternet media typeimage jbigDeveloped byISO IEC ITU TInitial release1993Type of formatImage file formatsExtended toJBIG2StandardsISO IEC 11544 ITU T Recommendations T 82 T 85 JBIG is based on a form of arithmetic coding developed by IBM known as the Q coder that also uses a relatively minor refinement developed by Mitsubishi resulting in what became known as the QM coder It bases the probability estimates for each encoded bit on the values of the previous bits and the values in previous lines of the picture JBIG also supports progressive transmission which generally incurs a small overhead in bit rate around 5 Contents 1 Patents 2 See also 3 References 4 External linksPatents editDoubts about patent licence requirements for JBIG1 implementations by IBM Mitsu bishi and AT amp T prevented the codec from being widely implemented in open source software 2 For example as of 2012 none of the commonly used web browsers supported it Since 2012 there are now no more JBIG1 patents in force the last ones to expire were Mitsubishi s patents in Canada and Australia on 25 February 2011 and in the United States on 4 April 2012 2 3 See also editISO IEC JTC 1 SC 29 JBIG2References edit Akramullah Shahriar 2014 Video Coding Standards Digital Video Concepts Methods and Metrics Apress pp 55 100 doi 10 1007 978 1 4302 6713 3 3 ISBN 978 1 4302 6712 6 a b JBIG1 patent information www cl cam ac uk archive ph archive ph Archived from the original on 2013 02 22 Retrieved 2023 01 21 a href Template Cite web html title Template Cite web cite web a CS1 maint bot original URL status unknown link External links editJBIG KIT a free C implementation of the JBIG encoder and decoder ISO IEC 11544 ITU T Recommendations T 82 T 85 RFC 2879 Content Feature Schema for Internet Fax V2 RFC 3949 File Format for Internet Fax nbsp This graphics software related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title JBIG amp oldid 1208291573, wikipedia, wiki, book, books, library,
