• DocumentCode
    845514
  • Title

    Activity function for DCT coded images

  • Author

    Nguyen, Duy T.

  • Volume
    25
  • Issue
    25
  • fYear
    1989
  • Firstpage
    1704
  • Lastpage
    1705
  • Abstract
    By combining a measure of activity in transform-coded image blocks with frequency sensitivity data, suitable psychovisual coefficient quantisation step sizes can be calculated. A number of possible definitions for an activity function AF are proposed. The most suitable of these is determined by comparing results on a subjective basis.
  • Keywords
    encoding; picture processing; transforms; DCT coded images; activity function; discrete cosine transform; frequency sensitivity data; picture processing; psychovisual coefficient; quantisation step sizes; spatial masking; transform-coded image blocks;
  • fLanguage
    English
  • Journal_Title
    Electronics Letters
  • Publisher
    iet
  • ISSN
    0013-5194
  • Type

    jour

  • DOI
    10.1049/el:19891139
  • Filename
    41978
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=845514