公开(公告)号：US20020114011A1

公开(公告)日：2002-08-22

申请号：US09737537

申请日：2000-12-15

Applicant: XEROX CORPORATION

Inventor： Gaurav Sharma ,  Shen-Ge Wang

IPC: G06K015/00 ,  H04N001/405

CPC classification number: H04N1/52

Abstract: A method and system for designing a plurality of correlated stochastic screens or conjugate screen portions intended for use in color halftoning of a corresponding plurality of color separations. A merit function is associated with each screen or screen portion. The merit function represents a measure of the desirability of the screen, particularly with regard to maximizing ink dispersion and optimizing spatial frequency response. An additional merit function value is associated with a combination of the screens and screen portions. Additional merit function represents a measure of desirability of the screen combination with regard to ink dispersion and combined spatial frequency response. The merit functions are iteratively applied to possible screens until an optimized merit value is calculated. The screens are selected that correspond to the optimized merit value. The image is generated using the selected screens in a conventional color halftoning process with a plurality of color separations.

公开(公告)号：US20040156078A1

公开(公告)日：2004-08-12

申请号：US10159432

申请日：2002-05-30

Applicant: Xerox Corporation

Inventor： Shen-Ge Wang ,  Beilei Xu ,  Chu-Heng Liu

IPC: H04N001/405

CPC classification number: H04N1/405

Abstract: The present invention relates to providing a designer with the tools for the manipulation of differential gloss in halftoned images. A special mask layer is provided for the rendering of desired glossmark image data. The desired glossmark image data is used to select between two halftones with anisotropic structure characteristics which are significantly different in orientation while remaining identical in density. This selection is made for each corresponding portion of primary image data. In this way, a halftone image of the primary image is generated with glossmarks imbedded therein which will display differential gloss without the need for special toners or paper.

Abstract translation: 本发明涉及为设计者提供用于在半色调图像中操纵差别光泽的工具。 提供了一种特殊的掩模层，用于渲染所需的光泽图像数据。 期望的光标图像数据用于在具有各向异性结构特征的两个半色调之间进行选择，这些特征在取向上显着不同，而密度保持相同。 对主图像数据的每个相应部分进行该选择。 以这种方式，生成具有镶嵌在其中的光泽度的主图像的半色调图像，其将显示不同的光泽，而不需要特殊的调色剂或纸张。

公开(公告)号：US20030156753A1

公开(公告)日：2003-08-21

申请号：US10082535

申请日：2002-02-21

Applicant: Xerox Corporation

Inventor： Zhigang Fan ,  Shen-Ge Wang ,  Hui Cheng

IPC: G06K009/00

CPC classification number: H04N1/32309 ,  G06T1/0021 ,  G06T2201/0601 ,  H04N1/32144 ,  H04N1/32341 ,  H04N1/6033 ,  H04N2201/0081 ,  H04N2201/3242 ,  H04N2201/3271 ,  H04N2201/3283

Abstract: A method for enhancing color fidelity in multi-reproduction, includes scanning an image to be reproduced, wherein the image contains an invisible digital watermark including color information; decoding the color information contained in the watermark; comparing the decoded color information with the scanned image; generating a correction table from the differences between the decoded color information and the scanned image; and performing color correction on the scanned image using the correction table. This method confines the color error to one generation, even when copies go through multiple reproduction.

公开(公告)号：US20040000786A1

公开(公告)日：2004-01-01

申请号：US10186065

申请日：2002-06-27

Applicant: Xerox Corporation

Inventor： Beilei Xu ,  Shen-Ge Wang ,  Chu-Heng Liu

IPC: H04N001/405 ,  B42D015/00 ,  G06K015/02

CPC classification number: H04N1/4058

Abstract: The present invention relates to the segmentation of an image into a main area and a image segment for variable glossmark data. By selectively applying halftones with anisotropic structure characteristics which are significantly different in orientation while remaining identical in density to the image segment, a variable glossmark may be superimposed within an image with reduced processing and storage requirements.

Abstract translation: 本发明涉及将图像分割为主区域和用于可变光泽标记数据的图像段。 通过选择性地应用具有各向异性结构特征的半色调，所述各向异性结构特征在取向上显着不同，同时保持与图像片段相同的浓度，可以在减少的处理和存储要求的图像内叠加可变的光标。

公开(公告)号：US20030133160A1

公开(公告)日：2003-07-17

申请号：US10044468

申请日：2002-01-11

Applicant: XEROX CORPORATION

Inventor： Gaurav Sharma ,  Shen-Ge Wang ,  Zhigang Fan

IPC: H04N001/405 ,  G06K015/00

CPC classification number: G06K15/107 ,  H04N1/4053

Abstract: A system and method for halftoning for multi-pass rendering of an image in which different pixel locations are rendered in each pass which reduces the effects of inter-pass mis-registration errors. The method of halftoning includes restricting a substantial majority of the pixels turned on to render a tone to the minimum number of passes required to produce the tone. The halftoning method can include generating a stochastic halftone turn-on sequence and re-ordering the turn-on sequence. The halftoning method can also use error diffusion, adding a zero mean bias signal to either the image input pixels or the threshold values. The halftoning method is applicable to color or black and white rendering.

Abstract translation: 用于半色调的系统和方法，用于在每次通过中渲染不同像素位置的图像的多遍渲染，其减少了通过间错误注册错误的影响。 半色调的方法包括将打开的大部分像素限制为产生音调所需的最小通过次数。 半色调方法可以包括产生随机半色调开启序列并重新排序开启序列。 半色调方法还可以使用误差扩散，向图像输入像素或阈值添加零平均偏置信号。 半色调方法适用于彩色或黑白渲染。

公开(公告)号：US20040085588A1

公开(公告)日：2004-05-06

申请号：US10285716

申请日：2002-10-31

Applicant: Xerox Corporation

Inventor： Robert P. Loce ,  Beilei Xu ,  Shen-Ge Wang

IPC: H04N001/405 ,  H04N001/409

CPC classification number: H04N1/4051

Abstract: A system and method for the halftoning of gray scale images by utilizing a pixel-by-pixel comparison of the image against an anisotropic stochastic screen is disclosed. The anisotropic stochastic screen comprises a non-deterministic, non-white noise function which, when thresholded, is designed to produce anisotropic dot patterns having a power spectrum characterized as having negligible low frequency components and a high-frequency region which has an absence of stronger dominant spikes.

Abstract translation: 公开了通过利用图像与各向异性随机屏幕的逐像素比较来对灰度图像进行半色调的系统和方法。 各向异性随机屏幕包括非确定性的非白噪声函数，其在阈值时被设计成产生具有特征在于具有可忽略的低频分量的功率谱的各向异性点图形和不存在强度的高频区域 主导尖峰。

公开(公告)号：US20030128395A1

公开(公告)日：2003-07-10

申请号：US10040546

申请日：2002-01-07

Applicant: XEROX CORPORATION

Inventor： Gaurav Sharma ,  Helen H. Shin ,  Shen-Ge Wang ,  Zhigang Fan

IPC: H04N001/405 ,  H04N001/46

CPC classification number: H04N1/52

Abstract: A method is provided for rendering a color image with a plurality of separations with a multi-level successive-filling halftoning process using a single screen for a plurality of separations. For a separation to be processed, first, from the possible multiple levels for the separation, the set of levels that would be used and the number of dots corresponding to the different levels are decided. These decisions are based on the input level for the separation and input levels for the prior process separations. The location of the dots to be printed for the different levels for the separation is then decided by using the halftone screen, while simultaneously taking into account the placement of printed dots for the prior separations. The selection is done so as to best disperse dots and minimize overlap.

Abstract translation: 提供了一种使用单个屏幕进行多次分色的多级连续填充半色调处理来渲染具有多个分色的彩色图像的方法。 对于待处理的分离，首先，从分离的可能的多个级别中，决定将使用的级别集合和对应于不同级别的点数。 这些决定基于先前过程分离的分离和输入水平的输入水平。 然后通过使用半色调屏幕来确定要分离的不同级别要打印的点的位置，同时考虑用于先前分离的打印点的位置。 进行选择以便最佳地分散点并最小化重叠。

公开(公告)号：US20030035145A1

公开(公告)日：2003-02-20

申请号：US09905556

申请日：2001-07-13

Applicant: XEROX CORPORATION

Inventor： Shen-Ge Wang

IPC: H04N001/405 ,  G06K015/00

CPC classification number: H04N1/52

Abstract: The invention provides methods for using single-cell non-orthogonal cluster screens to satisfy the moirnull-free conditions for four-color halftoning. The selection of these single-cell halftone screens is determined by identifying combinations of four of the halftone cells which satisfy moirnull-free conditions provided in the respective frequency equations. Constraints may be applied and the combinations not meeting such constraints can be removed.

Abstract translation: 本发明提供了使用单细胞非正交聚类屏幕来满足四色半色调无摩擦条件的方法。 通过识别满足在各个频率方程式中提供的无摩擦条件的四个半色调细胞的组合来确定这些单细胞半色调筛选的选择。 可以应用约束，并且可以去除不符合这些限制的组合。

公开(公告)号：US20040114160A1

公开(公告)日：2004-06-17

申请号：US10319054

申请日：2002-12-12

Applicant: Xerox Corporation

Inventor： Shen-Ge Wang ,  Beilei Xu ,  Chu-Heng Liu

IPC: H04N001/405 ,  H04N001/50 ,  G03G021/04

CPC classification number: H04N1/00883 ,  G03G21/043 ,  H04N1/405

Abstract: The present invention relates to the manipulation of differential gloss as may be inherent in halftoned images by utilization of tags. By selectively applying halftones with anisotropic structure characteristics, which are significantly different in orientation while remaining identical in density, as directed by tag settings, a gloss image may be superimposed within an image without the need for special toners or paper. Conventional copier systems will not typically be able to copy such a superimposed gloss image.

Abstract translation: 本发明涉及通过利用标签对半色调图像固有的差异光泽的操作。 通过选择性地应用具有各向异性结构特征的半色调，其在取向上显着不同，同时保持密度相同，如标签设置所指示的，光泽图像可以叠加在图像内，而不需要特殊的调色剂或纸张。 传统的复印机系统通常不能复制这种叠加的光泽图像。

公开(公告)号：US20030081256A1

公开(公告)日：2003-05-01

申请号：US10020676

申请日：2001-10-30

Applicant: Xerox Corporation

Inventor： Shen-Ge Wang ,  Zhigang Fan

IPC: H04N001/405 ,  G06K015/00

CPC classification number: H04N1/4058

Abstract: A method of constructing a halftone screen includes selecting a frequency and screen angle of interest. A subcell having spatial vectors which satisfy the selected frequency and screen angle of interest is identified. A supercell comprising an array of the subcells is formed. An integer relationship potentially having numerous solutions exists between the supercell and the subcell. The integer relationship is solved for values of the integers and then tested against the values for the subcell spatial vectors. Although the solution may in some cases be the null set, in many cases there will be numerous solutions. Each resulting solution, if any, is then tested according to any additional constraints or tolerances specified for the particular halftone screen. If any of the resulting supercell solutions satisfies the tests, that supercell may be used to create a halftone screen.

Abstract translation: 构建半色调网屏的方法包括选择频率和屏幕感兴趣的角度。 识别具有满足所选择的频率和屏幕感兴趣角度的空间矢量的子小区。 形成包括子电池阵列的超电池。 在超级单元和子单元之间存在潜在地具有许多解决方案的整数关系。 针对整数的值求解整数关系，然后根据子单元空间向量的值进行测试。 尽管解决方案在某些情况下可能是空集，但在许多情况下，将有许多解决方案。 然后根据为特定半色调屏幕指定的任何附加约束或公差测试每个产生的解决方案（如果有的话）。 如果所得到的超细胞溶液中的任何一种满足测试，则该超级细胞可用于产生半色调筛选。