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    Hadamard transformcoding of television signals. A theoretical investigation of the adaptive coding of Hadamard transformed television signals. The use of computable objective measures for the assessment of local subpicture characteristics in selecting appropriate coders.

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    Publication date
    2010-06-30T09:07:11Z
    Author
    Morsi, Ibrahim Zakaria
    Supervisor
    Downing, O.J.
    Keyword
    Hadamard transform multicoder scheme
    Television signals
    Transform domain coefficient
    Directing Indexes
    Television subpictures
    Local characteristics
    Rights
    Creative Commons License
    The University of Bradford theses are licenced under a Creative Commons Licence.
    Institution
    University of Bradford
    Department
    Postgraduate School of Studies in Electrical and Electronic Engineering
    Awarded
    1980
    
    Metadata
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    Abstract
    The problem of determining an objective means for assessing local characteristics of television subpictures in a Hadamard transform multicoder scheme is stated and discussed. Detailed investigations of transform domain coefficient statistical characteristics for different test images have been conducted. Both monochrome and colour signals were used, as well as different transform sizes and shapes. " Directing Indexes " are proposed which, depending on the inter-relationships among transform coefficients and groups of coefficients, direct each subpicture to the appropriate coder. Three indexes in the case of monochrome signals are proposed, each with its own computational procedures and application requirements. Necessary modifications and changes for application of some indexes on colour signals are also discussed. The proposed technique of indexing eliminates the necessity of equal distribution of subpictures among 'activity classes', a major disadvantage encountered in present activity index. Coders to be used with each directing index are devised and tested, subject to an arbitrary bit rate of 2 bits per pixel, with satisfactory performance compared with some published results for other techniques.
    URI
    http://hdl.handle.net/10454/4354
    Type
    Thesis
    Qualification name
    PhD
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