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1. 发明授权

US07835034B1 Halftone method and apparatus that provides a line screen frequency of N/2 for a printer resolution of N dots per inch without negative print effects 有权
标题翻译：半色调方法和设备，提供N / 2的线屏幕频率，用于打印机分辨率为N点/英寸，无负面打印效果
公开(公告)号：US07835034B1
公开(公告)日：2010-11-16
申请号：US09571968
申请日：2000-05-16
申请人： Joan LaVerne Mitchell , Timothy James Trenary , Danielle K. Dittrich , Yue Qiao
发明人： Joan LaVerne Mitchell , Timothy James Trenary , Danielle K. Dittrich , Yue Qiao
IPC分类号： G06K15/00
CPC分类号： H04N1/52
摘要： A halftone method and apparatus provides a line screen frequency of N/2 for a printer resolution of N without negative print effects. A 300 lines per inch halftone screen for a 600 dpi printer may thus be created by alternating white and saturated colored lines when half of a given color component's pels are on. Empirical rules are used to create the screens based on how that printer creates consistent and reliable levels for each color component. These rules allow intermediate intensity values between white and full-on at each pel. Since the halftoning is done in the hardware just before printing, the print direction relative to the threshold matrix is known. No rotation capability is needed in the hardware. If an image needs to be rotated, it can be done previously to being sent to the hardware. Furthermore, because a pair of pels are turned on for the lightest values (or possibly with a one level difference between the first and second dots in the pair), the electronics are stressed less. Moreover, the drive will be at a lower frequency than the first dot in the traditional halftone cell, which remains isolated for many levels.
摘要翻译：半色调方法和装置为N的打印机分辨率提供N / 2的线屏幕频率，而不产生负打印效果。因此，当一个给定的颜色分量的像素的一半被打开时，可以通过交替的白色和饱和的彩色线来创建用于600dpi打印机的300线/英寸半色调屏幕。经验规则用于根据打印机为每个颜色组件创建一致和可靠的级别创建屏幕。这些规则允许在每个像素之间的白色和全开之间的中间强度值。由于半色调在打印之前的硬件中完成，所以相对于阈值矩阵的打印方向是已知的。在硬件中不需要旋转能力。如果需要旋转图像，则可以先将图像发送到硬件。此外，由于一对像素被打开以获得最轻的值（或者可能具有一对中的第一和第二点之间的一个电平差），所以电子元件的应力较小。此外，驱动器将处于比传统半色调电池中的第一个点更低的频率，其保持隔离许多级别。

2. 发明授权

US07310168B2 Method and apparatus for controlling a spot function for digital halftoning 有权
标题翻译：用于控制数字半色调的点功能的方法和装置
公开(公告)号：US07310168B2
公开(公告)日：2007-12-18
申请号：US09898254
申请日：2001-07-03
申请人： Jennifer Quirin Trelewicz , Danielle K. Dittrich , Yue Qiao , Gerhard Robert Thompson , Chai Wah Wu
发明人： Jennifer Quirin Trelewicz , Danielle K. Dittrich , Yue Qiao , Gerhard Robert Thompson , Chai Wah Wu
IPC分类号： H04N1/405 , G06K15/00
CPC分类号： G06K15/02 , H04N1/4055
摘要： A digital halftoning technique for controlling a spot function is disclosed. A method for generating a spot for use in halftoning according to the present invention includes defining a spot function that combines two functions selected to provide a predetermined spot shape for use in a halftone cell and scaling the spot function using a scaling function that varies according to a value of a first and second spot function ordinate. Asymmetric modulation of spot functions is used to control the touching of adjacent spots, and to change the shape of the spots with the gray region.
摘要翻译：公开了一种用于控制光点功能的数字半色调技术。根据本发明的用于产生用于半色调的斑点的方法包括定义点功能，其组合选择的两个功能以提供用于半色调单元的预定斑点形状，并且使用根据第一和第二点函数纵坐标的值。点函数的不对称调制用于控制相邻斑点的触摸，并改变斑点与灰色区域的形状。

3. 发明授权

US07345790B2 Method and apparatus for simulating 2 bit-per-pel printing on a bi-level printer using intelligent double dotting 有权
标题翻译：用于使用智能双点划线在双层打印机上模拟2位/每像素打印的方法和装置
公开(公告)号：US07345790B2
公开(公告)日：2008-03-18
申请号：US10248450
申请日：2003-01-21
申请人： Danielle K. Dittrich , Larry M. Ernst
发明人： Danielle K. Dittrich , Larry M. Ernst
IPC分类号： H04N1/405
CPC分类号： H04N1/40068 , H04N1/405
摘要： An image processing method and apparatus for enhancing the quality of a printed image without degrading overall printer performance or throughput by simulating 2 bit pel printing on a bi-level printer using intelligent double dotting. The present invention allows a bi-level printer to print an 2N dpi 1 bit-per-pel image through intelligent double dotting, thus enhancing the half resolution rendered image to approach the print quality as if the image were rendered at full resolution. In one embodiment, an enhanced resolution mode which uses a bi-level printer's 1200 dpi mode to print 600 dpi, 2 bit-per-pel images, results in an image having higher resolution quality than rendering the image using traditional halftone methods at either 600 dpi or 1200 dpi. Image enhancement through higher order resolution multiplication is also disclosed.
摘要翻译：一种图像处理方法和装置，用于通过使用智能双点模拟在双层打印机上模拟2位像素打印，来提高打印图像的质量而不降低整体打印机性能或吞吐量。本发明允许双电平打印机通过智能双点打印2N dpi 1比特像素图像，从而增强半分辨率渲染图像以接近打印质量，好像图像以全分辨率呈现。在一个实施例中，使用双电平打印机的1200dpi模式来打印600dpi，每像素2像素图像的增强分辨率模式导致具有比用600的传统半色调方法渲染图像更高的分辨率质量的图像 dpi或1200 dpi。还公开了通过更高阶分辨率乘法的图像增强。

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