JBIG is a losslessimage compression standard from the Joint Bi-level Image Experts Group, standardized as ISO/IEC standard 11544 and as ITU-T recommendation T.82. 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 the Fax Group 4 standard, and in some situations, it offers a 30-fold improvement. Lossless data compression is a class of data compression algorithms that allows the original data to be reconstructed exactly from the compressed data. ... Image compression is the application of data compression on digital images. ... The Joint Bi-level Image Experts Group (JBIG) is a group of experts nominated by national standards bodies and major companies to work to produce standards for bi-level image coding. ... A binary image is a digital image that has only two possible values for each pixel. ... Jump to: navigation, search JBIG2 is an image compression standard for bi-level images, developed by the Joint Bi-level Image Experts Group. ... This page is a candidate to be moved to Wiktionary. ...
JBIG uses a form of arithmetic coding patented by IBM known as the Q-coder. It bases the probabilities of each bit on the previous bits and the previous lines of the picture. In order to allow compressing and decompressing images in scanning order, it does not reference future bits. JBIG also supports progressive transmission with small (around 5%) overheads. Arithmetic coding is a method for lossless data compression. ... Jump to: navigation, search International Business Machines Corporation (IBM, or colloquially, Big Blue) NYSE: IBM (incorporated June 15, 1911, in operation since 1888) is headquartered in Armonk, NY, USA. The company manufactures and sells computer hardware, software, and services. ...
External links
JBIG-KIT – a freeC implemenentation of the JBIG encoder and decoder
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.
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.
Feeds |
Contact