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    • 11. 发明授权
    • Masks with modulated clustering and aperiodicity and rescaling of masks
    • 具有调制聚类和非周期性和面罩重新缩放的面具
    • US06597813B1
    • 2003-07-22
    • US09265861
    • 1999-03-11
    • Mikel J. StanichGerhard R. ThompsonCharles P. TresserChai W. Wu
    • Mikel J. StanichGerhard R. ThompsonCharles P. TresserChai W. Wu
    • G06K936
    • H04N1/4051
    • A technique combines most of the advantages of both blue noise and clustering in generating a partially clustered aperiodic mask and using it in a dither array algorithm for halftoning, such that the amount of clustering can be modulated. A method to create an enlarged partially clustered aperiodic dither mask, appearing as a modulated version of a periodic enlargement of original mask, is used when the original mask generates patterns that are not visually pleasing or the original mask doesn't generate enough distinct grey levels. The method of halftoning of grey scale images utilizes a pixel-by-pixel comparison of the image against a partially clustered aperiodic mask in which the clustered aperiodic mask is comprised of a partly random and partly deterministic single valued function which is designed to produce visually pleasing dot configurations when thresholded at any level of grey. A method for changing a number of distinct grey levels a mask can produce to be used in halftoning of grey scale images produces advantages for some printing devices.
    • 一种技术将蓝噪声和聚类的大部分优点结合在生成部分聚集的非周期性掩模中,并将其用于用于半色调的抖动阵列算法中,使得可以调制聚类量。 当原始掩模产生不令人满意的图案或者原始掩模不产生足够的不同灰度级时,使用一种形成放大的部分聚集的非周期性抖动掩模的方法,作为原始掩模的周期性放大的调制版本 。 灰度图像的半色调的方法利用图像与部分聚集的非周期掩模的逐像素比较,其中聚集的非周期性掩模由部分随机和部分确定性的单值函数组成,其被设计为产生视觉上令人满意的 在任何灰度级别进行阈值处理时的点配置。 用于改变掩模可以产生用于灰度图像的半色调的不同灰度级数的方法为一些打印设备产生了优势。