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Layered Coding. Basic Overview. Outline. Pyramidal Coding Scalability in the Standard Codecs Layered Coding with Wavelets Conclusion. Laplacian w/ Gaussian Pyramids. Laplacian w/ DCT Coefficient Pyramids. DCT Pyramid Example. Figure 7.5. Reconstruction Data for Fig. 7.5.

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Layered coding

Layered Coding

Basic Overview


Outline
Outline

  • Pyramidal Coding

  • Scalability in the Standard Codecs

  • Layered Coding with Wavelets

  • Conclusion






Scalability in the standard codecs
Scalability in the Standard Codecs

  • Data Partitioning

  • Signal-to-Noise Ratio (SNR)

  • Spatial

  • Temporal







Scalability applications
Scalability Applications

  • Data Partitioning

    • Video of ATM networks

  • SNR

    • Transmission of video at different qualities

      • Video on demand, simultaneous TV and enhanced TV

    • Video over high packet loss networks (Internet)

  • Spatial Scalability

    • Internetworking between two different standards

    • Simulcasting of drift-free video (TV & HDTV)


Scalability applications1
Scalability Applications

  • Spatial Scalability (continued)

    • Reception of low spatial resolution pictures over mobile networks

  • Temporal Scalability

    • Migration to HDTV from current interlaced

    • Internetworking between mobile and fixed networks


Layered coding with wavelets
Layered Coding with Wavelets

  • Growing interest due to new efficient coding techniques (Embedded Zero-tree Wavelets, or EZW)

  • Accepted for coding of still images

    • MPEG-4 and JPEG 2000

  • Predicted to continues in growth


Discrete wavelet transform
Discrete Wavelet Transform

  • Split signal spectrum into several frequency bands analysis filters

    Figs. 7.27, 7.28, 7.29




Higher order systems
Higher Order Systems

Multiple wavelet transform coding by means of repeated two-band splits


Further considerations
Further Considerations

  • Wavelet Example – Fig. 7.32

  • Zero-Tree Coding – Fig. 7.34

  • Quad-Tree Representation

    • Bands look like scaled versions of each other

    • Lower bands have 0.25 dimension of higher


Conclusion
Conclusion

  • Layered coding facilitates

    • Error protection

    • Efficient use of resources

    • Multiple services

    • Customer satisfaction


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