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MPEG-4 Applications

MPEG-4 Applications. Interactive TV (broadcast) Streaming media on the web (internet) Multimedia titles (CD-ROM) Network games Mobile multimedia (picture phone). Technical Capabilities. Define media objects Audio and visual Natural and synthetic Define composition architecture

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MPEG-4 Applications

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  1. MPEG-4 Applications • Interactive TV (broadcast) • Streaming media on the web (internet) • Multimedia titles (CD-ROM) • Network games • Mobile multimedia (picture phone)

  2. Technical Capabilities • Define media objects • Audio and visual • Natural and synthetic • Define composition architecture • Scene graph extended/borrowed from VRML • System level • Streams: Multiplexing, synchronization, buffering • Programmability? • Simple interaction

  3. Structured Video • Natural representation: Exposure sheets • Layers and elements, alpha compositing • Chroma keying and blue-screen mattes • Compression • Standard video compression • Trouble with motion and object boundaries • Trouble with graphics: text, graphics • Object coding/Computer graphics models • Compact format: e.g. cels • Resolution independent • But beware! Be clever!

  4. Video Stream • VS > VO > VOL > GOV > VOP • Video object • Shape + Motion + Texture • Sprites • Texture + Projective transformation

  5. Shape Coding • Bounding box + shape-adaptive macroblocks • Alpha / Shape • Binary • Transparent or opaque • Context-based arithmetic encoder • Motion predicted • Grey (coded as textures) • Texture • Shape-based DCT • Padding algorithm

  6. Scalable Video • Layered video • Spatial scalability: base + enhancement • Temporal scalability: IPI + B = IBPBI • Scalable content • Quality improves with decoder technology • Inherent resolution independence (text,midi)

  7. 2D Meshes • Type • Uniform rectangular • Triangular (Delauney) • Geometry • Intra: Predict position compression • Inter: Compressed motion vector • Texture • Piecewise affine texture map • Wavelet compression ala mipmaps

  8. Face • Facial Definition Parameter or user supplied model/texture • Facial Animation Parameter plus Amplification and Filters

  9. References

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