| 摘要 |
Apparatus and method for screening an image for half-tone reproduction by image reproduction apparatus which includes a marking device, preferably a laser beam, which is operative to mark a medium along a multiplicity of parallel marking lines. The method includes the steps of providing a digital representation of density values of an original image, determining whether to rotate dot shape information in accordance with the dot shape symmetry and density, rotating dot shape information if the symmetry and density criteria are met, storing said dot shape information in its rotated on nonrotated form, said dot shape information representative of a screen function; and extracting said dot shape information from storage for said density values in the form of information that designates on and off points for each marking line. The apparatus includes means for carrying the steps of the disclosed method.
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