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    Printing of digital colour images with locally adjusted halftoning
    1.
    发明公开
    Printing of digital colour images with locally adjusted halftoning 有权
    Farbdruck digitaler Bilder mit lokal angepasster Halbtonrasterung

    公开(公告)号：EP1073261A1

    公开(公告)日：2001-01-31

    申请号：EP00202545.0

    申请日：2000-07-18

    申请人： Océ-Technologies B.V.

    发明人： Van Strijp, Romeo Maria ,  Fabel, Ronald

    IPC分类号： H04N1/52 ,  H04N1/58

    CPC分类号： H04N1/58 ,  H04N1/52

    摘要： Method of and apparatus for printing colour images by the superimposition of a number of separations, using a first half-tone technique optimised for surface reproduction, such as dithering, and a second half-tone technique, differing from the first and optimised for edge reproduction, such as thresholding with error diffusion.
    The second half-tone technique is used in edge transitions for pixels of a separation which substantially influences the edge transition, and the said first half-tone technique is used outside the edge transition, while the first half-tone technique is used throughout in the case of pixels of a separation which provide no or minimal contribution to the edge transition.

    摘要翻译： 使用针对表面再现优化的第一半色调技术（例如抖动）和第二半色调技术通过叠加多个分色来打印彩色图像的方法和装置，第二半色调技术不同于第一和针对边缘再现优化 ，例如具有误差扩散的阈值。 第二半色调技术用于分离像素的边缘变换，其基本上影响边缘转变，并且所述第一半色调技术在边缘转变之外使用，而第一半色调技术在 分离像素的情况，其不对边缘转变提供没有或最小的贡献。