Stochastic clustered-dot dithering
Stochastic clustered-dot dithering
复制标题
随机簇点抖动
DOI：
10.1117/12.334594
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
R. Hersch
中科院分区：
文献类型：
--
作者：
V. Ostromoukhov;R. Hersch
一种新的技术，用于建立随机群集点屏幕被提出。通过首先布置网点中心来构造包括数千个随机布置的网点的大抖动矩阵。网点中心是通过在自由单元位置处放置选定半径的离散盘来获得的，当根据离散旋转的Haldom空间填充曲线或随机空间填充曲线遍历抖动阵列单元时。在对网点中心进行Delauney三角剖分之后，计算每个网点的最大表面并创建等强度区域。该等强度图被转换成抗锯齿灰度图像，即转换成初步阈值的阵列。这些阈值被重新编号以获得最终抖动阈值阵列的阈值。通过改变圆盘半径，网点尺寸可以适应特定印刷设备的特性。较大的网点可以改善具有重要网点扩大的打印机的色调再现。
A new technique for building stochastic clustered-dot screens is being proposed. A large dither matrix comprising thousands of stochastically laid out screen dots is constructed by first laying out the screen dot centers. Screen dot centers ar obtained by placing discrete disks of a chosen radius at free cell locations when traversing the dither array cells according to either a discretely rotated Halberd space-filling curve or a random space-filling curve. After Delauney triangulation of the screen dot centers, the maximal surface of each screen dot is computed and iso- intensity regions are created. This iso-intensity map is converted to an anti-aliased grayscale image, i.e. to an array of preliminary threshold values. These threshold values are renumbered to obtain the threshold values of the final dither threshold array. By changing the disk radius, the screen dot size can be adapted to the characteristics of particular printing devices. Larger screen dots may improve the tone reproduction of printers having important dot gain.