Digital video: television, communications, and computer specialists are working to unsnarl the exchange of material in any video format
Article Abstract:
The Digital Systems Information Exchange, which first met in Nov 1990, involved engineers from various disciplines in a conference to decide how best to move ahead in digital imagery. The meeting, which was sponsored by the Advanced Television Systems Committee and the IEEE-USA Committee on Communications and Information Policy, outlined areas of commonality with the aim of considering frameworks for managing digital images that take the best advantage of current and future developments in television, computers and telecommunications. According to Gary Demos of DemoGraFX, the need is for an architecture that is 'scalable' and 'extensible,' as well as open. By scalable, Demos means able to use various resolutions, temporal rates, colorimetry and intensity dynamic ranges, and by extensible, he means having an ability to function with new requirements and applications. More Digital Systems Information Exchange meetings were held in Mar 1991 and Sep 1991. The latter meeting was sponsored by the Society of Motion Picture Engineers (SMPTE), which was committed to two projects: a digital interface header/descriptor protocol that would allow digitized images to be used across industries and regardless of standards; and a hierarchy of standards to coordinate differing industry display requirements. The overall goal is to facilitate interoperability among high-resolution display systems.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1992
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An abundance of video formats: achieving a universal descriptor and an interformat exchange structure are crucial to the promise of digital imaging
Article Abstract:
Digital video standards are being developed for still pictures, videoconferencing and full-motion video by the Joint Photographic Experts Group (JPEG), the International Telegraph and Telephone Consultative Committee (CCITT) and the Moving Picture Experts Group (MPEG), respectively. The JPEG's proposal involves a general-purpose compression standard that can be used for applications such as photovideotex, desktop publishing, graphic arts, color facsimile, wirephoto transmissions or medical imaging. The standard for videophone and videoconferencing, which is recommendation H.261, also known as px64, covers the channel capacity of the integrated services digital network (ISDN). The MPEG standard for full-motion video is for storage media such as CD ROM, digital audio tape, Winchester disk and writable disks; or the standard can be used on communication channels such as ISDN or local area networks (LANs). The MPEG standard is generic and is independent of any particular application. Besides JPEG, H.261 and MPEG, other formats, including analog formats of NTSC, PAL and Secam, digital formats for HDTV, and proprietary multimedia digital video formats such as DVI, CD-I, CDTV and PhotoCD, must be considered before true interoperability is achieved. Digital video interchange will require development of a standardized header/descriptor and a structure for interformat exchange.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
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