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9.7. Summary

In this chapter, an overview of the MPEG-4 Visual SNHC tools was presented. SNHC work began in 1994 in the context of the MPEG-4 project, as a new type of activity in MPEG. MPEG-4 SNHC combines graphics, animation, compression, and streaming capabilities in a framework that allows for integration with (natural) audio and video. Face and body animation enables the integration of synthetic talking characters into an interactive media presentation. 2D mesh animation can be used to overlay an image or video over a movie (e.g., to integrate advertisements into the movie). 3D mesh coding allows for compressing a VRML ASCII file down to 2%–4% of its original size without visual degradation, for error resilient-transmission, and for incremental rendering of arbitrary 3D meshes. Profiles defined for 2D mesh animation allow for manipulating images and video and for face and body animation, which allows the efficient download and animation of synthetic faces and bodies.

The current SNHC activities target the AFX, which will enrich the SNHC vision and set of tools, notably by supporting advanced animation capabilities.


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