Naslov
MPEG-4: Audio/Video & Synthetic Graphics/Audio for Mixed Media

Autori
Doenges, Peter ; Capin, Tolga ; Lavagetto, Fabio ; Ostermann, Joern ; Pandžić, Igor ; Petajan, Eric

Izvornik
Image Communications (0923-5965) 5 (1997), 4; 433-463

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Scalable multimedia; Natural/synthetic hybrid coding; 2D/3D graphic; Facial/avatar animation; Text/graphics integration; Text-to-speech synthesis; Geometry/texture compression; Structured synthetic audio; Real-time communications; Virtual environments

Sažetak
MPEG-4 addresses coding of digital hybrids of natural and synthetic, Aural and Visual (A/V) information. The objective of this Synthetic/Natural Hybrid Coding (SNHC) is to facilitate content-based manipulation, interoperability, and wider user access in the delivery of animated mixed media. SNHC will support non-real-time and passive media delivery, as well as more interactive, real-time applications. Integrated spatial-temporal coding is sought for audio, video, and 2D/3D computer graphics as standardized A/V objects. Targets of standardization include mesh-segmented video coding, compression of geometry, synchronization between A/V objects, multiplexing of streamed A/V objects, and spatial-temporal integration of mixed media types. Composition, interactivity, and scripting of A/V objects can thus be supported in client terminals, as well as in content production for servers, also more effectively enabling terminals as servers. Such A/V objects can exhibit high efficiency in transmission and storage, plus content-based interactivity, spatial-temporal scalability, and combinations of transient dynamic data and persistent downloaded data. This approach can lower bandwidth of mixed media, offer tradeoffs in quality vs. update for specific terminals, and foster varied distribution methods for content that exploit spatial and temporal coherence over busses and networks. MPEG-4 responds to trends at home and work to move beyond the paradigm of audio/video as a passive experience to more flexible A/V objects which combine audio/video with synthetic 2D/3D graphics and audio.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika, Računarstvo, Informacijske i komunikacijske znanosti

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