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    • 3. 发明授权
    • Perpendicular, equal frequency non-conventional screen patterns for
electronic halftone generation
    • 用于电子半色调产生的垂直,等频非常规屏幕图案
    • US5264926A
    • 1993-11-23
    • US22747
    • 1993-02-19
    • Richard L. Rylander
    • Richard L. Rylander
    • H04N1/405H04N1/46
    • H04N1/4058
    • A screen system used in the electro-optical reproduction of half-tone pictures in multicolor prints are generated by an algorithm which simulates a continuous tone image containing a range of gray shades from black to white or a color separation. The "threshold equation" is the key of the invention as it calculates a threshold gray value that is compared to the desired local image value to determine whether that particular point should be "on" or "off". Which points (spots) are "on" and which are "off" is determined by the function that assigns a "threshold" value (the shade at which a pixel changes from "off" to "on") based on a pixels "x" and "y" coordinates. The generated screen comprises columns and rows of halftone dots which are not all centered at addressable raster grid points. The screens are anharmonic rational screens with the columns and rows both geometrically orthogonal (perpendicular) and equally spaced, but with some dots not centered at the addressable raster grid points. The dots are not all identical in either shape or size.
    • 用于多色打印中的半色调图像的电光再现的屏幕系统通过一种算法来产生,该算法模拟包含从黑色到白色或颜色分离的灰度范围的连续色调图像。 “阈值方程”是本发明的关键,因为它计算与所需局部图像值进行比较的阈值灰度值,以确定该特定点是否应该是“开”或“关”。 哪个点(点)是“开”的,哪个“关”是由分配“阈值”值(像素从“关”改变为“开”)的功能基于像素“x” “和”y“坐标。 生成的屏幕包括不能全部以可寻址光栅网格点为中心的中间色调点列和行。 屏幕是非调谐的合理屏幕,列和行几何正交(垂直)和等间距,但是一些点不在可寻址光栅网格点的中心。 这些点在形状或大小上都不是完全相同的。
    • 10. 发明授权
    • Thinned halftone dot patterns for inkjet printing
    • 用于喷墨打印的薄型半色调点图案
    • US5602572A
    • 1997-02-11
    • US295603
    • 1994-08-25
    • Richard L. Rylander
    • Richard L. Rylander
    • B41J2/205B41J2/21B41J2/505B41J2/52G06K15/10
    • G06K15/102B41J2/2132H04N1/405
    • A set of thinned halftone dot patterns useful in inkjet printing comprises a plurality of halftone cells corresponding to respective shade values. Each of the halftone cells includes a plurality of addressable points, with at least some of the points being turned "on" to define a halftone dot pattern, and at least some of the "on" points defining a core component of the halftone dot pattern being selectively turned "off", thereby producing a thinned halftone dot pattern. The thinned halftone dot patterns enable the use of higher addressability in an inkjet printing system to achieve a wider range of shade values while avoiding undesirable over-inking of printed halftone dot patterns due to excessive overlap between printed ink spots. The thinned halftone dot patterns prevent significant overlap between adjacent ink spots in the core, or "interior", component when the halftone dot pattern is printed by the inkjet printing system, but preserves the entire edge component to maintain desired halftone cell definition. Thinned halftone cells can be stored in a memory as "glyphs" and retrieved by an inkjet printing system to print higher addressability halftone images with enhanced quality and a wider range of shade values.
    • 用于喷墨打印的一组变薄的半色调点图案包括对应于各个色调值的多个半色调单元。 每个半色调单元包括多个可寻址点,其中至少一些点被转向“开”以限定半色调点图案,并且至少一些“开”点限定网版点图案的核心分量 被选择性地关闭,从而产生变薄的半色调点图案。 变薄的半色调点图案使得能够在喷墨打印系统中使用更高的寻址能力来实现更宽范围的色调值,同时避免由于印刷墨点之间的过度重叠而导致的印刷半色调点图案的不期望的过度墨水。 当通过喷墨打印系统打印半色调点图案时,变薄的半色调点图案防止了芯中相邻墨点或“内部”部件之间的显着重叠,而是保留整个边缘部件以保持所需的半色调细胞定义。 变薄的半色调细胞可以作为“字形”存储在存储器中并由喷墨打印系统检索,以打印具有增强的质量和更宽范围的色调值的更高可寻址性半色调图像。