公开(公告)号：EP1202558A2

公开(公告)日：2002-05-02

申请号：EP01125062.8

申请日：2001-10-22

申请人： Xerox Corporation

发明人： Wang, Shen-ge ,  Fan, Zhigang ,  Wen, Zehnhuan

IPC分类号： H04N1/52

CPC分类号： H04N1/52

摘要： The invention provides methods for using single-cell non-orthogonal cluster screens to satisfy the moiré-free conditions for color halftoning. The invention also provides methods that combine single-cell non-orthogonal cluster screens and line screens for moiré-free color halftoning. Particularly, the selection of these single-cell halftone screens is determined by satisfying moiré-free conditions provided in the respective spatial or frequency equations.

摘要翻译： 本发明提供了使用单细胞非正交簇筛选以满足无色条件进行色调的方法。 本发明还提供了组合单细胞非正交簇屏和用于无莫尔色调色的线屏的方法。 特别地，通过满足在各个空间或频率方程式中提供的无摩尔条件来确定这些单细胞半色调屏幕的选择。

公开(公告)号：EP1014686A3

公开(公告)日：2002-01-30

申请号：EP99125140.6

申请日：1999-12-16

申请人： Xerox Corporation

发明人： Mantell, David A. ,  Balasubramanian, Thyagarajan

IPC分类号： H04N1/52

CPC分类号： H04N1/52

摘要： A digital printer and a method is provided to print an image having at least two different colors. The printer comprises a first halftone screen associated with a first color and arranged at a first angle, and a second halftone screen associated with a second color and arranged at the first angle. The first and second screens, respectively, comprise dots that do not overlap when the sum of the two colors is less than or equal to 100% coverage.

公开(公告)号：EP1154636A2

公开(公告)日：2001-11-14

申请号：EP01111476.6

申请日：2001-05-09

申请人： Phase One A/S

发明人： Jonsson, Michael ,  Andersen, Casper Find ,  Knudsen, Niels V.

IPC分类号： H04N1/52

CPC分类号： H04N1/52

摘要： The present invention relates to an image processing method and system for reduction of Colour Moiré that are simple and efficient. In particular, the present invention relates to a digital image processing method of eliminating Moiré in a digital image divided into pixels holding pixel component values selecting a pixel, defining a pixel window around the selected first pixel, identifying a set of pixels consisting of pixels within the window that have pixel component values within a pixel component value range that is related to the selected first pixel, calculating a pixel component value based on corresponding pixel component values of pixels in the set of pixels, and allocating the calculated pixel component value to the selected first pixel.

摘要翻译： 本发明涉及一种简单有效的减少彩色莫尔图像的图像处理方法和系统。 特别地，本发明涉及一种数字图像处理方法，该方法是将数字图像中的莫尔（Moiré）去除，该数字图像被划分为保持选择像素的像素分量值的像素，在所选择的第一像素周围限定像素窗口， 所述窗口具有与所选择的第一像素相关的像素分量值范围内的像素分量值，基于所述像素组中的像素的相应像素分量值计算像素分量值，并将所计算的像素分量值分配给 选择的第一个像素。

公开(公告)号：EP0748109B1

公开(公告)日：2001-06-06

申请号：EP96202434.5

申请日：1992-07-15

申请人： Agfa Corporation ,  XEIKON NV

发明人： Delabastita, Paul

IPC分类号： H04N1/40 ,  H04N1/52

CPC分类号： H04N1/52 ,  G03F5/22 ,  H04N1/4058

公开(公告)号：EP1026878A2

公开(公告)日：2000-08-09

申请号：EP00300829.9

申请日：2000-02-03

申请人： SEIKO EPSON CORPORATION

发明人： Fujita, Toru, c/o Seiko Epson Corporation

IPC分类号： H04N1/405 ,  H04N1/52

CPC分类号： H04N1/52 ,  H04N1/4058

摘要： An image reproduction engine which causes toner to adhere to a development region of certain area located at a certain position within dots according to image reproduction data is utilized for image processing, wherein a halftone is expressed by means of halftone spots formed from a plurality of dots. The centroid of the halftone spot formed from a single dot or a plurality of adjacent dots is shifted from the center of the dot to an arbitrary position, thus achieving desired screen angles or desired pitches of halftone spots. As a result, screen angles related to an irrational tangent can be realized, and the pitches of halftone spots of a plurality of color screens can also be made uniform.

摘要翻译： 这导致调色剂的图像再现引擎附着到位于雅丁图象再现数据被用于图像处理的点内的某些位置的某些区域的显影区域，worin半色调通过从点的形成的多个半色调点的方式过表达 ， 从一个单一的点或相邻点的形成的多个半色调点的质心从点的中心移动到在任意位置，从而实现所需的屏幕角度或半色调点的期望的音高。 其结果是，涉及到均匀，无理正切屏幕角度可以实现的，并且因此彩色屏幕的多个半色调点的间距可以由

公开(公告)号：EP0812102A3

公开(公告)日：2000-05-31

申请号：EP97108442.1

申请日：1997-05-26

申请人： EASTMAN KODAK COMPANY

发明人： Spaulding, Kevin Edward ,  Miller, Rodney L. ,  Schildkraut, Jay S.

IPC分类号： H04N1/40 ,  H04N1/52

CPC分类号： H04N1/52 ,  H04N1/4051

摘要： A method for halftoning a multi-channel digital color image having an x,y array of color pixel values, includes the steps of: providing a matrix of dither values for each color channel of the digital color image wherein two or more of the matrices of dither values are designed jointly to minimize a visual cost function; for each color channel modularly addressing the matrix of dither values with the location of a pixel in the digital color image to obtain an addressed dither value; comparing the addressed dither value for each color channel with the pixel value for the corresponding color channel to determine an output halftone image value for each color channel; and repeating steps b and c for each pixel in the digital image.

公开(公告)号：EP0814602A3

公开(公告)日：1999-11-10

申请号：EP97304244.3

申请日：1997-06-17

申请人： Hewlett-Packard Company

发明人： Noh, Jae Jung

IPC分类号： H04N1/52 ,  H04N1/40

CPC分类号： H04N1/407 ,  H04N1/52

摘要： In acquiring and reproducing an image, my method and apparatus correct for spurious gray background. Image brightness is sensed in multiple regions of an original image, to provide a corresponding multiplicity of signals for use in reproducing the image. In response to the multiple signals, a corresponding multiplicity of corrected signals is provided by adjusting each signal. The amount of adjustment depends on the size of the signal, and preferably includes jitter - i. e. , a random component. Preferably the random component is partially smoothed. The multiple corrected signals are used in reproduction of the image. Preferably the dependence of adjustment on signal size is a multivalued monotonic function. Preferably the function increases the brightness of image regions that are already relatively more bright, in comparison with image regions that are relatively less bright. Preferably the signals represent relative amounts of black, or darkness of a chromatic color; and for each signal a choice is made automatically between the greater of (1) zero and (2) a corresponding one of the multiple signals.

公开(公告)号：EP0806865A3

公开(公告)日：1998-11-11

申请号：EP97303148

申请日：1997-05-08

申请人： CANON INFORMATION SYST INC

发明人： OSTROMOUKHOV VICTOR

IPC分类号： B41J2/52 ,  G06F3/12 ,  G06T5/00 ,  H04N1/46 ,  H04N1/52 ,  H04N1/60

CPC分类号： H04N1/52

摘要： A gray component replacement method for each pixel of a continuous tone image, first obtains intermediate halftone colorant values by applying any suitable halftoning technique to continuous tone colorant values. Halftone output values at each pixel, including a black output value, are determined based on the intermediate halftone values. If desired, halftone output values can be determined based on both the intermediate halftone values and the continuous tone colorant values.

摘要翻译： 对于连续色调图像的每个像素的灰色成分替换方法，首先通过对连续色调着色剂值应用任何合适的半色调技术来获得中间色调着色剂值。 基于中间半色调值确定每个像素处的半色调输出值，包括黑色输出值。 如果需要，可以基于中间半色调值和连续色调着色剂值来确定半色调输出值。

公开(公告)号：EP0817468A1

公开(公告)日：1998-01-07

申请号：EP97304784.8

申请日：1997-07-01

申请人： XEROX CORPORATION

发明人： Lin, Ying-wei ,  Loj, Katherine

IPC分类号： H04N1/52

CPC分类号： H04N1/52

摘要： A method and apparatus for creating color images are effective to reduce two-color moiré. The techniques apply a non-periodic halftone operation (152) to the color separation for a less perceptible color (e.g., yellow) and periodic halftone operations (150, 154, 158) to color separations for more perceptible colorants (e.g. cyan, magenta and black). The techniques prevent the formation of periodic structures due to the interaction of the yellow colorant with one of the other colorants (e.g., cyan or magenta).

摘要翻译： 用于产生彩色图像的方法和装置有效地减少双色莫尔条纹。 这些技术将非周期性半色调操作（152）应用于颜色分离，以便较不可察觉的颜色（例如黄色）和周期性半色调操作（150,154,158），以便为更可感知的着色剂（例如青色，洋红色和 黑色）。 由于黄色着色剂与其它着色剂（例如，青色或品红色）之间的相互作用，这些技术阻止了周期性结构的形成。

公开(公告)号：EP0707414A3

公开(公告)日：1997-08-13

申请号：EP95307165.1

申请日：1995-10-11

申请人： SEIKO EPSON CORPORATION

发明人： Shu, Joseph S.

IPC分类号： H04N1/52

CPC分类号： H04N1/52

摘要： A gray balance correction technique eliminates artifacts, caused by the accumulation of diffusion errors, from a predominantly "gray" tonal area of a halftone image. According to the technique, pixel tonal values associated with three input colors are initially examined to detect a condition that specifies production of a gray image area. Upon detecting this condition, errors from previously processed pixels are averaged prior to being "diffused" among these input color pixels. Thereafter, the input pixels are processed in accordance with conventional halftoning operations and the resulting binary pixels values are passed to an output buffer for printing. Averaging of the errors prior to error diffusion ensures that the detected condition is maintained through preprocessing of those input color pixel values.

摘要翻译： 该方法涉及将第一输入像素，一个来自每个流，成多个第一量化误差的。 然后worin的第二输入像素的色调值检测的状态下，从每个流，是相等的。 第一量化误差，响应于所述检测步骤搜索一起处理并在第一量化误差的每个值被转换为等于平均所述第一量化误差的值。 因此，该方法需要从每个流的respectivement第二输入像素的色调值相加来自每个流的平均第一个量化值，以便保持的条件在整个预处理操作，从而改善半色调图像的质量。