Controlling and Efficient coding of MPEG-4 Compliant Avatars

摘要: AbstractThe MPEG-4 includes support not only for naturalvideo and audio, but also synthetic graphicsand sounds. Version 2 therepresentation of human bodies in addition tofaces. In the Committee Draft,Body Animation Parameters (BAPs) BodyDefinition (BDPs) allow virtual bodiesto be streamed very low bit rates providedeformation body surface based on skeletonposture. this paper, we overview codingusing MPEG-4, discuss compliant avatarcontrol, present our experimental results.Keywords: SNHC, Body 1. Introduction ISO/IEC JTC1/SC29/WG11 (Moving PicturesExpert Group - MPEG) is currently working theVersion standard scheduled tobecome International Standard December 1999.In a world where audio-visual data increasinglystored, transferred manipulated digitally,MPEG-4 sets its objectives beyond ‘plain’compression. Instead regarding video as asequence frames with fixed shape size andwith attached audio information, scene isregarded set dynamic objects. Thus thebackground might one object, amoving car another, sound engine thethird etc. The objects are spatially temporallyindependent therefore can stored,transferred independently. Thecomposition final done at thedecoder, potentially allowing great manipulationfreedom to consumer data.Video acquired by recording fromthe real called natural. thenatural objects, synthetic, computer generatedgraphics sounds being produced usedin ever increasing quantities. aims toenable integration within thescene. It will provide 3D Graphics,synthetic sound, Text Speech, well assynthetic faces bodies. paper weconcentrate representation inMPEG-4, particular efficient coding ofbody animation.The following section provides introductionto MPEG-4. Weexplain how andBody Definition used define theshape animation Then presentour algorithm encoding BodyAnimation DefinitionParameters. sections theresults conclusions, ideas forfuture work.