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JPEG
JPEG
1. Acronym for Joint Photographic Expert Group, the committee – a joint CCITT and ISO/IEC group – that works on the storage and transmission of still images and developed the ISO 10918 standard (see below). 2. The ISO 10918 standard, Digital Compression and Coding of Continuous Still Images, developed by JPEG for image compression of single digital images. The goal was to develop a general-purpose compression standard to meet the needs of almost all continuous-tone still-image applications, reducing either the bandwidth needed to transmit the image or the amount of memory needed to store it. In its simplest mode of operation, JPEG can be thought of as compressing an image broken into 8 by 8 blocks of pixels. Each 8 by 8 block is processed by a pipeline of processes: discrete cosine transform to produce a representation of the sample as a collection of DCT coefficients, which are then quantized and entropy encoded (Huffman or arithmetic coding options exist). Decoding is the reverse of this process. In addition, JPEG defines a lossless compression mode based on a simple predictive method. There is also a hierarchical encoding mode of operation that provides a pyramidal encoding at multiple resolutions, each differing by a factor of two in the horizontal direction, vertical direction, or both, from its adjacent encoding. JPEG also makes provision for representing multiple-component images (color, spectral bands or channels), where each component consists of a rectangular array of samples. See also MPEG. |
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Cite this article
JOHN DAINTITH. "JPEG." A Dictionary of Computing. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. JOHN DAINTITH. "JPEG." A Dictionary of Computing. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O11-JPEG.html JOHN DAINTITH. "JPEG." A Dictionary of Computing. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O11-JPEG.html |
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JPEG
JPEG See JOINT PHOTOGRAPHIC EXPERTS GROUP.
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Cite this article
DARREL INCE. "JPEG." A Dictionary of the Internet. 2001. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. DARREL INCE. "JPEG." A Dictionary of the Internet. 2001. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O12-JPEG.html DARREL INCE. "JPEG." A Dictionary of the Internet. 2001. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O12-JPEG.html |
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JPEG
JPEG (ˈdʒeɪpɛg) Computing Joint Photographic Expert Group
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Cite this article
FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "JPEG." The Oxford Dictionary of Abbreviations. 1998. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "JPEG." The Oxford Dictionary of Abbreviations. 1998. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O25-JPEG.html FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "JPEG." The Oxford Dictionary of Abbreviations. 1998. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O25-JPEG.html |
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