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PRISM: A video coding paradigm with motion estimation at the decoder.

Rohit Puri1, Abhik Majumdar, Kannan Ramchandran

  • 1Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA. rpuri@eecs.berkeley.edu

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|October 12, 2007
PubMed
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PRISM, a new video coding paradigm, uses distributed compression for enhanced robustness and flexible complexity. This novel approach offers rapid recovery from transmission losses, ideal for wireless video.

Area of Science:

  • Information Theory
  • Digital Signal Processing
  • Computer Vision

Background:

  • Conventional video coding (MPEGx, H.26x) relies on predictive coding, facing limitations like "drift" and fixed complexity distribution.
  • Distributed compression principles offer alternative paradigms for video encoding and decoding.

Purpose of the Study:

  • Introduce PRISM, a novel video coding paradigm based on lossy distributed compression.
  • Address architectural limitations of conventional video codecs, focusing on drift robustness and complexity flexibility.
  • Explore a light encoder/heavy decoder architecture enabled by PRISM.

Main Methods:

  • Leveraging multiuser information theory and Wyner-Ziv coding principles.
  • Developing a video coding architecture distinct from motion-compensated predictive coding.

Related Experiment Videos

  • Implementing a flexible distribution of computational complexity, shifting motion-search to the decoder.

    • Main Results:

    • PRISM demonstrates inbuilt robustness to encoder-decoder drift.
    • Preliminary results show PRISM's rapid recovery from transmission losses, outperforming contemporary codecs.
    • A light encoder/heavy decoder paradigm was successfully explored.

    Conclusions:

    • PRISM offers significant architectural advantages over traditional video codecs.
    • The paradigm's robustness and recovery characteristics make it suitable for wireless video transmission.
    • PRISM presents a promising alternative for future video coding standards.