公开(公告)号：US07688473B2

公开(公告)日：2010-03-30

申请号：US10973725

申请日：2004-10-26

申请人： Connie F. Purdum ,  Robert P. Loce ,  Beilei Xu ,  David J. Lieberman ,  Mark A. Gwaltney ,  Jon S. McElvain ,  Charles M. Hains

发明人： Connie F. Purdum ,  Robert P. Loce ,  Beilei Xu ,  David J. Lieberman ,  Mark A. Gwaltney ,  Jon S. McElvain ,  Charles M. Hains

IPC分类号： H04N1/409

CPC分类号： H04N1/4092 ,  H04N1/4058

摘要： Disclosed herein is an image processing method for producing enhanced halftone edges, particularly suited to those edges which only lie upon the background as apposed to those edges which abut other halftone screens. It utilizes a step of defining border pixels and a step of halftoning those border pixels in a different manner than the halftoning applied to the interior region of the tint or image segment. The preferred halftone for the border pixels will be related to the interior halftone by some number of common spatial frequency harmonics. Examples of common-harmonic screening for an edge include, but are not limited to: (a) same screen with different tone reproduction characteristics (boosted edge values); (b) same screen angles and frequencies with a different spot function, possibly phase shifted; (c) a dot screen whose frequency vectors can be generated by the frequency vectors of the interior screen; (d) a line screen whose frequency vectors can be generated by the frequency vectors of the interior screen. This generation process is directed to ensuring that the two screens will be “harmonically matched” where at least one of the fundamental frequency vectors and harmonics of the first screen will equal at least one of the fundamental frequency vectors and harmonics of the second screen.

摘要翻译： 本文公开了一种用于生产增强的半色调边缘的图像处理方法，特别适合于仅靠在与其它半色调屏幕相邻的那些边缘上的背景的那些边缘。 它利用定义边框像素的步骤和以与应用于色调或图像片段的内部区域的半色调不同的方式对这些边界像素进行半色调的步骤。 用于边框像素的优选半色调将通过若干数量的共同空间频率谐波与内部半色调相关。 用于边缘的共谐波筛选的示例包括但不限于：（a）具有不同色调再现特性（增强边缘值）的相同屏幕; （b）具有不同光点功能的相同屏幕角度和频率，可能相移; （c）可以通过内部画面的频率矢量生成频率矢量的点画面; （d）可以通过内部画面的频率矢量生成其频率矢量的行画面。 该生成处理旨在确保两个屏幕将被“谐波匹配”，其中基本频率矢量和第一屏幕的谐波中的至少一个将等于第二屏幕的基本频率矢量和谐波中的至少一个。

公开(公告)号：US06327043B1

公开(公告)日：2001-12-04

申请号：US08715664

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： 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 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.

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。

公开(公告)号：US06262811B1

公开(公告)日：2001-07-17

申请号：US09004102

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： B41B1500

CPC分类号： H04N1/4058

摘要： This is a halftone circuit which, in addition to the usual counting and addressing mechanisms, has control over the phase, angle and direction of the addressing circuitry of the array in memory so that regular dots, mirror images of dots and out-of-phase dots can be created from a single array, thus saving memory hardware. The mirror images can be made by counting rows in either direction, the angle can be varied by varying the number of pixels shifted between scans, and the phase can be varied by setting the starting point to any row and column. In this way, a single array can be used to create a number of dots.

摘要翻译： 这是一种半色调电路，除了通常的计数和寻址机制之外，还可以控制存储器中阵列的寻址电路的相位，角度和方向，使得常规点，点的镜像和不相位 可以从单个阵列创建点，从而节省内存硬件。 可以通过在任一方向上计数行来制作镜像，可以通过改变在扫描之间移动的像素的数量来改变角度，并且可以通过将起点设置为任何行和列来改变相位。 以这种方式，可以使用单个阵列来创建多个点。

公开(公告)号：US06192149B1

公开(公告)日：2001-02-20

申请号：US09056954

申请日：1998-04-08

申请人： Reiner Eschbach ,  Charles M. Hains

发明人： Reiner Eschbach ,  Charles M. Hains

IPC分类号： G06K900

CPC分类号： H04N1/60 ,  G06T5/009 ,  G06T5/40 ,  H04N1/4074

摘要： A method and apparatus are provided for improving the quality of a printed image by first automatically determining the gamma (&ggr;) of an image, and then adjusting the &ggr; of the printer, if necessary, to correspond to that of the image. Thus, if an image has a &ggr; of 2, the &ggr; of the printer will be adjusted from approximately 1 (its normal &ggr;), to approximately 2 (i.e., corresponding to that of the image). To detect the &ggr; difference problem, the invention detects a shift in saturated colors towards higher digital counts. Then, through mapping of the color space from three dimensions to two dimensions and cross-plotting values of saturation and luminance, a cumulative histogram plot of luminance is developed. The histogram displays the 256 luminance bands, arranged in one of eight bands, and normalized from zero to one. A threshold value is established for the cumulative histogram plot and the value of the cumulative histogram is compared to the threshold. If the threshold is exceeded in most of the bands, the &ggr; for the image matches that of the printer. However, if the threshold is not exceeded, a false &ggr; image may be indicated, for example. In this case, the &ggr; of the printer may be automatically adjusted (e.g., increased from approximately 1 to approximately 2). Thus, the printed image will then be of the same quality as the original image.

摘要翻译： 提供了一种方法和装置，用于通过首先自动确定图像的伽马（gamma）来改善打印图像的质量，然后如果需要，则调整打印机的伽玛以对应于图像的伽马（gamma）。 因此，如果图像的伽马值为2，打印机的伽马将从大约1（其正常伽马）调整到大约2（即，对应于图像的伽玛）。 为了检测伽马差异问题，本发明检测饱和颜色向较高数字计数的偏移。 然后，通过将颜色空间从三维映射到二维和交叉绘制饱和度和亮度值，开发了亮度的累积直方图。 直方图显示布置在八个频带之一中的256个亮度带，并从零归一化为一。 对累积直方图绘制阈值，并将累积直方图的值与阈值进行比较。 如果在大多数频带中超过了阈值，则图像的伽玛与打印机的伽玛匹配。 然而，如果不超过阈值，则可以指示假伽马图像。 在这种情况下，可以自动调整打印机的伽玛（例如，从大约1增加到大约2）。 因此，打印的图像将具有与原始图像相同的质量。

公开(公告)号：US07576893B2

公开(公告)日：2009-08-18

申请号：US11841150

申请日：2007-08-20

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。

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。