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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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