公开(公告)号：US07345786B2

公开(公告)日：2008-03-18

申请号：US10368690

申请日：2003-02-18

申请人： David E. Rumph ,  Charles M. Hains

发明人： David E. Rumph ,  Charles M. Hains

IPC分类号： G06F15/00

CPC分类号： H04N1/608

摘要： A method for color cast removal in a scanned image in L*a*b* space includes generating a first color cast correction curve for mapping L* to a first color correction, Δa*, (or Δb*) wherein the first correction curve provides a desired a* shift in midtone regions and is modulated as a function of L* such that black and white points are unaffected; for each pixel n in the scanned image, passing L*n through the first color cast correction curve for obtaining a value of Δa*n; and adding the value of Δa*n to the scanned image's original a*n component. To ensure that the color corrected a* remains within gamut, a second correction curve for applying a clipping factor to the mapped Δa* may be generated with the a*n passing through the second correction curve for obtaining a clipping factor Cn; and modifying the a*n value by Cn(Δa*n).

摘要翻译： 一种用于在L * a * b *空间中的扫描图像中去色调的方法包括：生成用于将L *映射到第一颜色校正的Deltaa *（或Deltab *）的第一色偏校正曲线，其中第一校正曲线 中间色调区域中所需的*移位，并且被调制为L *的函数，使得黑色和白色点不受影响; 对于扫描图像中的每个像素n，通过第一颜色转换校正曲线的L * 以获得Deltaa * N n的值; 并将Deltaa * N 的值添加到扫描图像的原始a * 分量。 为了确保校正的颜色a *保持在色域内，可以通过经过第二校正曲线的a * N n生成用于将削波因子应用于映射的Deltaa *的第二校正曲线，以获得 剪切因子C 并且通过C n n n（ΔΔ* N n）修改a * N 值。

公开(公告)号：US07277201B2

公开(公告)日：2007-10-02

申请号：US10445851

申请日：2003-05-28

申请人： Charles M. Hains

发明人： Charles M. Hains

IPC分类号： G06F15/00 ,  H04N1/60

CPC分类号： H04N1/4058

摘要： Historically, the creation of digital line screens was considered to be a subset of the creation of the digital cluster dot screens. The geometric constraints necessary for digital cluster dot screens were imported into the creation of digital line screens. Accordingly, the number of available angles or digital line screens was also significantly limited. In various exemplary embodiments of the systems and methods according to this invention, a digital line screen cell is defined such that the vectors defining the digital line screen cell are not necessarily isometric and are not necessarily at right angles to each other. By using a high-addressability grid that has different resolutions along x and y axis of the grid, the systems and methods according to this invention allow the components of the vectors along the high-addressability direction to be noninteger multiples of the components of the vectors along the other direction of the grid.

摘要翻译： 历史上，数字线屏幕的创建被认为是创建数字集群点阵屏幕的一个子集。 数字集群点阵屏幕所需的几何约束被导入数字线屏幕的创建。 因此，可用角度或数字线屏幕的数量也受到显着限制。 在根据本发明的系统和方法的各种示例性实施例中，定义数字线屏幕单元，使得定义数字线屏幕单元的矢量不一定是等距的，并且不一定彼此成直角。 通过使用在网格的x和y轴上具有不同分辨率的高可寻址性网格，根据本发明的系统和方法允许向量沿着高寻址方向的分量成为向量分量的非整数倍数 沿着电网的另一个方向。

公开(公告)号：US06943808B2

公开(公告)日：2005-09-13

申请号：US10320841

申请日：2002-12-16

申请人： Charles M. Hains ,  Sang-Chul Kang

发明人： Charles M. Hains ,  Sang-Chul Kang

IPC分类号： G06T5/00 ,  G06T5/20 ,  H04N1/405 ,  H04N1/409 ,  G09G5/00 ,  G06K9/32 ,  G06K9/40 ,  G06K15/00

CPC分类号： H04N1/4055 ,  G06T5/002 ,  G06T2200/12 ,  G06T2207/10024

摘要： The system and method reduces aliasing which is formed by the patterns that are introduced by the halftone screens used in the printer. The system and method provides halftone-specific anti-alias filters for obtaining optimal effective resolution in printed images. A method of reducing aliasing in a digital image includes providing a digital image; selecting a halftone screen for halftoning the digital image, wherein the halftone screen has a directional component associated with it; filtering the digital image with an antialiasing filter, the antialiasing filter having been designed to have a directional frequency response that is optimized for the directional component of the selected halftone screen; and halftoning the filtered digital image.

摘要翻译： 该系统和方法减少了由打印机中使用的半色调屏幕引入的图案形成的混叠。 该系统和方法提供了半色调专用抗混叠滤波器，用于在打印图像中获得最佳的有效分辨率。 减少数字图像中的混叠的方法包括：提供数字图像; 选择用于半色调数字图像的半色调屏幕，其中所述半色调屏幕具有与其相关联的定向分量; 用抗混叠滤波器对数字图像进行滤波，抗混叠滤波器被设计成具有针对所选择的半色调屏幕的方向分量优化的方向频率响应; 并对滤波后的数字图像进行半色调处理。

公开(公告)号：US06442300B1

公开(公告)日：2002-08-27

申请号：US09225667

申请日：1999-01-05

申请人： Charles M. Hains

发明人： Charles M. Hains

IPC分类号： G06K138

CPC分类号： H04N1/4052

摘要： A method of generating one image dot from three image pixels. The values of the three pixels are summed. If the sum indicates a dot that is equal to or darker than ⅔ black, the two outer thirds of the dot are set to black and the central third is set to a shade of gray. If the sum indicates a dot that is equal to or lighter than ⅓ white, central third of the dot is set to white and the outer two thirds are set to a shade of gray. The shades of gray are generated by using high addressability, and error diffusion is used to diffuse the rounding off errors implicit in the high addressability process.

摘要翻译： 从三个图像像素生成一个图像点的方法。 将三个像素的值相加。 如果总和表示等于或暗于⅔黑色的点，则点的两个外部三分之二设置为黑色，中央第三个设置为灰色阴影。 如果总和表示等于或小于1/3的点，则点的中心三分之一设置为白色，外部三分之二设置为灰色。 通过使用高可寻址性生成灰色阴影，并且使用误差扩散来扩展在高可寻址性过程中隐含的舍入误差。

公开(公告)号：US06429948B1

公开(公告)日：2002-08-06

申请号：US09632787

申请日：2000-08-04

申请人： David E. Rumph ,  Robert M. Coleman ,  Charles M. Hains ,  James K. Kenealy ,  Mark T. Corl ,  Russell R. Atkinson ,  Michael F. Plass ,  Eric S. Nickell ,  L. Dale Green ,  Robert R. Buckley

发明人： David E. Rumph ,  Robert M. Coleman ,  Charles M. Hains ,  James K. Kenealy ,  Mark T. Corl ,  Russell R. Atkinson ,  Michael F. Plass ,  Eric S. Nickell ,  L. Dale Green ,  Robert R. Buckley

IPC分类号： G06K1500

CPC分类号： G06F3/1244 ,  G06F3/1208 ,  G06K15/00 ,  G06K15/1822 ,  G06K15/1848 ,  G06K2215/0002 ,  H04N1/40

摘要： An object optimized printing system and method includes a page description language decomposing system, a command instruction and data generating system and an image output terminal controller. The PDL decomposition system inputs a plurality of pages in the page description language and locates the plurality of objects forming each page and their object types. Based on the determine object types and any explicit rendering commands, the PDL decomposition system automatically generates rendering tags for each of the objects. The rendering tags are used to control the command instruction and data generating system, the IOT controller and/or the IOT to optimize the printing by the IOT on an object-by-object basis. Based on the objects and the generated rendering tags, the command instruction and data generating system generates the differing types of data and the command instructions on a scanline-by-scanline basis. The generated command instructions and data are output to the IOT controller scanline-by-scanline. The data output to the IOT controller includes metabit data generated from the rendering tags. The metabit data is used to control various subsystems of the IOT controller and the IOT to optimize the printing characteristics, of the IOT for each differing object on each scanline. The metabits can optimize such processing subsystems as halftone generation, halftone screen size and angle, color space transformation, tone reproduction curve, IOT output correction and the like. Using this system, each page output by the IOT has the printing characteristics for each object within the page optimized to the object's types.

摘要翻译： 对象优化打印系统和方法包括页面描述语言分解系统，命令指令和数据生成系统以及图像输出终端控制器。 PDL分解系统输入页面描述语言中的多个页面，并且定位形成每个页面的多个对象及其对象类型。 基于确定对象类型和任何显式渲染命令，PDL分解系统自动为每个对象生成渲染标记。 渲染标签用于控制命令指令和数据生成系统，IOT控制器和/或IOT，以便在逐个对象的基础上优化IOT的打印。 基于对象和生成的渲染标签，命令指令和数据生成系统基于逐行扫描线生成不同类型的数据和命令指令。 生成的命令指令和数据被输出到IOT控制器逐行扫描线。 输出到IOT控制器的数据包括从渲染标签生成的元数据。 元数据用于控制IOT控制器和IOT的各个子系统，以优化每个扫描线上每个不同对象的IOT的打印特性。 半导体器件可以优化这样的处理子系统，如半色调产生，半色调屏幕尺寸和角度，颜色空间转换，色调再现曲线，IOT输出校正等。 使用该系统，IOT输出的每个页面都具有针对对象类型优化的页面内每个对象的打印特征。

公开(公告)号：US06208430B1

公开(公告)日：2001-03-27

申请号：US09003733

申请日：1998-01-07

申请人： Charles M. Hains ,  Gwendolyn L. Hembrock ,  Chan Chang

发明人： Charles M. Hains ,  Gwendolyn L. Hembrock ,  Chan Chang

IPC分类号： G06K936

CPC分类号： H04N1/4058

摘要： A circuit which uses less memory to store halftone arrays in a high addressability printer by storing regular halftone arrays as low addressability arrays and by outputting each pixel a number of times, the number being the ratio of high to low addressability. For example, if a high addressability system uses 4 sub pixels for each pixel, then one value of each low addressability array is stored in one location and the halftone circuit is controlled to output that value 4 times, once for each sub pixel thus saving memory by a factor of 4.

摘要翻译： 一种电路，其使用较少的存储器将半色调阵列存储在高可寻址性打印机中，通过将常规半色调阵列存储为低可寻址性阵列并且通过多次输出每个像素，该数字是高到低寻址能力的比率。 例如，如果高可寻址性系统对于每个像素使用4个子像素，则每个低寻址性阵列的一个值被存储在一个位置中，并且半色调电路被控制以输出该值4次，因此每个子像素一次，从而节省存储器 乘以4。

公开(公告)号：US06256104B1

公开(公告)日：2001-07-03

申请号：US08715509

申请日：1996-09-18

申请人： David E. Rumph ,  Robert M. Coleman ,  Charles M. Hains ,  James K. Kenealy ,  Mark T. Corl ,  Russell R. Atkinson ,  Michael F. Plass ,  Eric S. Nickell ,  L. Dale Green ,  Robert R. Buckley

发明人： David E. Rumph ,  Robert M. Coleman ,  Charles M. Hains ,  James K. Kenealy ,  Mark T. Corl ,  Russell R. Atkinson ,  Michael F. Plass ,  Eric S. Nickell ,  L. Dale Green ,  Robert R. Buckley

IPC分类号： G06F1500

CPC分类号： H04N1/40 ,  G06F3/1297 ,  G06K15/00 ,  G06K15/1822 ,  G06K15/1848 ,  G06K2215/0002

摘要： An object optimized printing system and method comprises a page description language decomposing system, a command instruction and data generating system and an image output terminal controller. The PDL decomposition system inputs a print file defining a plurality of pages in the page description language and locates the plurality of objects forming each page and their object types. Based on the determine object types and any explicit rendering commands in the PDL file, the PDL decomposition system automatically generates rendering tags for each of the objects. The rendering tags are used to control the command instruction and data generating system, the IOT controller and/or the image output terminal to optimize the printing by the IOT on an object-by-object basis. Based on the objects and the generated rendering tags, the command instruction and data generating system generates the differing types of data and the command instructions on a scanline-by-scanline basis. The generated command instructions and data are output to the IOT controller scanline-by-scanline. The data output to the IOT controller includes metabit data which is generated from the rendering tags. The metabit data output to the IOT controller is used to control various subsystems of the IOT controller and the IOT to optimize the printing characteristics of the IOT for each differing object on each scanline. The metabits can optimize such processing subsystems as halftone generation, halftone screen size and angle, color space transformation, tone reproduction curve, IOT output correction, and the like. Using this system, each page output by the IOT has the printing characteristics for each object within the page optimized to the object's types.

摘要翻译： 对象优化打印系统和方法包括页面描述语言分解系统，命令指令和数据生成系统以及图像输出终端控制器。 PDL分解系统输入定义页面描述语言中的多个页面的打印文件，并且定位形成每个页面的多个对象及其对象类型。 根据PDL文件中确定的对象类型和任何显式渲染命令，PDL分解系统会自动为每个对象生成渲染标记。 渲染标签用于控制命令指令和数据生成系统，IOT控制器和/或图像输出端子，以优化IOT在逐个对象的基础上的打印。 基于对象和生成的渲染标签，命令指令和数据生成系统基于逐行扫描线生成不同类型的数据和命令指令。 生成的命令指令和数据被输出到IOT控制器逐行扫描线。 输出到IOT控制器的数据包括从渲染标签生成的元数据。 输出到IOT控制器的元数据用于控制IOT控制器和IOT的各个子系统，以优化每个扫描线上每个不同对象的IOT的打印特性。 半导体器件可以优化这样的处理子系统，如半色调产生，半色调屏幕尺寸和角度，颜色空间转换，色调再现曲线，IOT输出校正等。 使用该系统，IOT输出的每个页面都具有针对对象类型优化的页面内每个对象的打印特性。

公开(公告)号：US6006013A

公开(公告)日：1999-12-21

申请号：US473886

申请日：1995-06-07

申请人： David E. Rumph ,  Robert M. Coleman ,  Charles M. Hains ,  James K. Kenealy ,  Mark T. Corl ,  Russell R. Atkinson ,  Margaret Motamed ,  Matthew Tucker ,  Michael F. Plass ,  Eric S. Nickell ,  L. Dale Green

发明人： David E. Rumph ,  Robert M. Coleman ,  Charles M. Hains ,  James K. Kenealy ,  Mark T. Corl ,  Russell R. Atkinson ,  Margaret Motamed ,  Matthew Tucker ,  Michael F. Plass ,  Eric S. Nickell ,  L. Dale Green

IPC分类号： G06F3/12 ,  G06K15/00 ,  H04N1/40 ,  G06F15/00

CPC分类号： H04N1/40 ,  G06F3/1297 ,  G06K15/00 ,  G06K15/1822 ,  G06K15/1848 ,  G06K2215/0002

摘要： An object optimized printing system and method comprises a page description language decomposing system, a command instruction and data generating system and an image output terminal controller. The PDL decomposition system inputs a print file defining a plurality of pages in the page description language and locates the plurality of objects forming each page and their object types. Based on the determine object types and any explicit rendering commands in the PDL file, the PDL decomposition system automatically generates rendering tags for each of the objects. The rendering tags are used to control the command instruction and data generating system, the IOT controller and/or the image output terminal to optimize the printing by the IOT on an object-by-object basis. Based on the objects and the generated rendering tags, the command instruction and data generating system generates the differing types of data and the command instructions on a scanline-by-scanline basis. The generated command instructions and data are output to the IOT controller scanline-by-scanline. The data output to the IOT controller includes metabit data which is generated from the rendering tags. The metabit data output to the IOT controller is used to control various subsystems of the IOT controller and the IOT to optimize the printing characteristics of the IOT for each differing object on each scanline.

公开(公告)号：US5381247A

公开(公告)日：1995-01-10

申请号：US237577

申请日：1994-05-03

申请人： Charles M. Hains

发明人： Charles M. Hains

IPC分类号： B41M1/14 ,  G06T5/00 ,  H04N1/46 ,  H04N1/52

CPC分类号： H04N1/52

摘要： A method of halftone printing in four colors using, for cyan, magenta and black, halftone screens that will result in screening angles of 15, 45 and 75 degrees, as is the standard process in the art, and a halftone screen for yellow that will result in screening angles of 0, +60 and -60 degrees. This combination will diminish the 2 color moire patterns that result from the interaction between the yellow and one of the other colorants. The 0 and + or -60 degree screening angles are generated by using a screen that produces a four-centered cell having dots that are spaced to form hexagons, when the nearest neighbors of a central dot are connected by lines, as opposed to the conventional trapezoidal orientation.

摘要翻译： 对于青色，品红色和黑色的半色调网版，使用四色的方法，如本领域的标准方法，将产生15,45和75度的屏幕角度，以及用于黄色的半色调屏幕 导致0，+60和-60度的屏蔽角度。 这种组合将减少由黄色和其他着色剂之间的相互作用产生的2色莫尔图案。 通过使用产生具有间隔开形成六边形的点的四中心单元的屏幕产生0和+或-60度屏蔽角度，当中心点的最近邻居线被连接时，与传统的 梯形取向。

公开(公告)号：US07274492B1

公开(公告)日：2007-09-25

申请号：US09569637

申请日：2000-05-12

申请人： Charles M. Hains ,  David E. Rumph ,  Vincent C. Lung

发明人： Charles M. Hains ,  David E. Rumph ,  Vincent C. Lung

IPC分类号： G06K15/00 ,  G06F15/00

CPC分类号： G06K15/00 ,  H04N1/405 ,  H04N1/4078

摘要： This invention is a method of producing a set of TRC's for a color printer's secondary halftone screens that is correlated with the printer's primary halftone screens. The method makes use of the printer/screen characteristic data that is normally gathered during screen calibration. However, instead of progressing from the data to a normal calibration for the secondary screens, the method goes backward through the data starting with the finished primary screen TRC's. The method insures that for every primary screen density, the closest possible secondary screen density is used when the same digital value is specified.

摘要翻译： 本发明是一种生产用于彩色打印机的二次半色调屏幕的一组TRC的方法，其与打印机的主要半色调屏幕相关。 该方法利用在屏幕校准期间通常收集的打印机/屏幕特征数据。 然而，该方法不是从数据进行到二级屏幕的正常校准，而是从完成的主屏幕TRC开始的数据向后移动。 该方法确保了对于每个主屏幕密度，当指定相同的数字值时，使用最接近的可能的二次屏幕密度。