Algorithms for coding scanned halftone pictures

Søren Forchhammer, Morten Forchhammer

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    A method for coding scanned documents containing halftone pictures, e.g. newspapers and magazines, for transmission purposes is proposed. The halftone screen is estimated and the grey value of each dot is found, thus giving a compact description. At the receiver the picture is rescreened. A novel data structure and related algorithms for handling the digital screen without restrictions on the screen parameters is presented. Data compression rates above 20 are obtained for the halftone pictures. The algorithms are suited for implementation with fast dedicated hardware. The rescreening can also be used as digital halftoning with arbitrary screens, using lookup tables
    Original languageEnglish
    Title of host publication9th International Conference on Pattern Recognition
    VolumeVolume 1
    Publication date1988
    ISBN (Print)0-8186-0878-1
    Publication statusPublished - 1988
    Event9th International Conference on Pattern Recognition - Rome, Italy
    Duration: 14 May 198817 May 1988
    Conference number: 9


    Conference9th International Conference on Pattern Recognition
    Internet address

    Bibliographical note

    Copyright: 1988 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE


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