Analysis of dyadic approximation error for hybrid video codecs with integer transforms.

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  • Author(s): Wong CW;Wong CW; Siu WC
  • Source:
    IEEE transactions on image processing : a publication of the IEEE Signal Processing Society [IEEE Trans Image Process] 2011 Oct; Vol. 20 (10), pp. 2780-7.
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Institute of Electrical and Electronics Engineers Country of Publication: United States NLM ID: 9886191 Publication Model: Print Cited Medium: Internet ISSN: 1941-0042 (Electronic) Linking ISSN: 10577149 NLM ISO Abbreviation: IEEE Trans Image Process Subsets: PubMed not MEDLINE
    • Publication Information:
      Original Publication: New York, NY : Institute of Electrical and Electronics Engineers, 1992-
    • Abstract:
      In this paper, we present an analysis of the dyadic approximation error introduced by the integerization of transform coding in H.264/AVC-like codecs. We derive the analytical formulations for dyadic approximation error and nonorthogonality error. We further classify the dyadic approximation error into a "system error" and a "nonflat error," and proposed two models for them. We found that the "nonflat error" has a substantial impact on video quality if the number of shifting bits at decoder side (DQ_BITS) is small. We also give a theoretical justification on why scaling factors at encoder side are better to be adapted to the rescaling factors at decoder side in H.264/AVC-like codecs.
      (© 2011 IEEE)
    • Publication Date:
      Date Created: 20110920 Date Completed: 20120118 Latest Revision: 20110919
    • Publication Date:
      20221213
    • Accession Number:
      10.1109/TIP.2011.2134105
    • Accession Number:
      21926003