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：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：US20020089708A1

公开(公告)日：2002-07-11

申请号：US09909319

申请日：2001-07-19

Applicant: XEROX CORPORATION

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

IPC: H04N001/46

CPC classification number: H04N1/52

Abstract: Moirnull free color halftoning is achieved through the use of two dot screens and one or two line screens. The line screens may be, for example hybrid line screens. Frequency vectors associated with the screens combine to produce moirnull frequency vectors representing moirnull frequencies above or below the visual range. In one embodiment lines screens are used to halftone yellow and black separations and dot screens are used to halftone cyan and magenta separations. The dot screens are oriented at 15 and 75 degrees. The line screens are oriented at 45 and 135 degrees. Selected screens and screen orientations minimize screen interaction with mechanical or optical artifacts of a rendering device, thereby minimizing mechanical and optical moirnull.

Abstract translation: 通过使用两个点阵屏幕和一个或两个线路屏幕实现无色的半色调。 线路屏幕可以是例如混合线路屏幕。 与屏幕相关联的频率矢量组合以产生表示莫尔频率高于或低于视觉范围的莫尔频率矢量。 在一个实施例中，线屏幕用于半色调黄色和黑色分色，并且点划线用于将青色和品红色分色进行半色调。 点画面定向为15度和75度。 线屏幕定向为45度和135度。 所选择的屏幕和屏幕取向使得与渲染设备的机械或光学伪像的屏幕交互最小化，从而最小化机械和光学莫尔。

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：US20030231349A1

公开(公告)日：2003-12-18

申请号：US10159423

申请日：2002-05-30

Applicant: Xerox Corporation

Inventor： Shen-ge Wang ,  Beilei Xu ,  Chu-heng Liu

IPC: H04N001/405 ,  B42D015/00

CPC classification number: H04N1/4058 ,  H04N1/00883

Abstract: The present invention relates to the manipulation of differential gloss as may be inherent in halftoned images. By selectively applying halftones with anisotropic structure characteristics which are significantly different in orientation while remaining identical in density, 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: 本发明涉及在半色调图像中固有的差异光泽的操作。 通过选择性地施加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，可以在图像内叠加光泽图像，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：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：US20040001233A1

公开(公告)日：2004-01-01

申请号：US10184219

申请日：2002-06-27

Applicant: Xerox Corporation

Inventor： Shen-ge Wang ,  Beilei Xu ,  Chu-heng Liu

IPC: H04N001/405 ,  B42D015/00

CPC classification number: G03G8/00 ,  B41M3/14 ,  H04N2201/3211 ,  H04N2201/3214 ,  H04N2201/3215 ,  H04N2201/3226 ,  H04N2201/3271

Abstract: The present invention relates to protecting printed items intended for public exchange having important informational indicia provided therein. The print items are protected from tampering by providing an informational indicia image as a glossmark. By selectively applying halftones with anisotropic structure characteristics which are significantly different in orientation while remaining identical in density to render information indicia, a glossmark image is produced of the information indicia. Such an information indicia glossmark image when provided in print item image helps protect that print item image from tampering.

Abstract translation: 本发明涉及保护用于公共交换的印刷品，其中提供了重要的信息标记。 通过提供信息标记图像作为光标，保护打印物品免受篡改。 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，同时保持密度相同以呈现信息标记，产生了信息标记的光泽标记图像。 当在打印项目图像中提供时，这样的信息标记光泽标记图像有助于保护该打印项目图像免受篡改。

公开(公告)号：US20030090729A1

公开(公告)日：2003-05-15

申请号：US09968651

申请日：2001-10-01

Applicant: XEROX CORPORATION

Inventor： Robert P. Loce ,  Michael Branciforte ,  Beilei Xu

IPC: B41J001/00 ,  H04N001/405 ,  G06K015/00

CPC classification number: H04N1/4052

Abstract: Error is distributed to pixels neighboring a pixel of interest based on a ranking of the neighboring pixels. The ranking is based on pixel values of the neighboring pixels. Optionally a spatial weighting is applied to the pixel values before ranking, to provide a preference for pixels closest to the pixel of interest or to a particular portion of a related halftone screen. Rank order based error diffusion provides compact halftone dots without patterning artifacts. An image processing system operative to perform rank order error diffusion includes a pixel ranker and an error diffuser. In a xerographic environment the image processing system includes a xerographic printer.

Abstract translation: 基于相邻像素的等级，将错误分布到与感兴趣像素相邻的像素。 排名基于相邻像素的像素值。 可选地，在排序之前对像素值应用空间加权，以提供对最靠近感兴趣的像素或相关半色调屏幕的特定部分的像素的偏好。 基于秩次的误差扩散提供了紧凑的半色调点，而没有图案化伪像。 可执行排序误差扩散的图像处理系统包括像素排列器和误差扩散器。 在静电复印环境中，图像处理系统包括静电印刷机。

公开(公告)号：US20040042678A1

公开(公告)日：2004-03-04

申请号：US10231220

申请日：2002-08-30

Applicant: XEROX CORPORATION

Inventor： Robert P. Loce ,  Beilei Xu ,  Jason Repko

IPC: G06T005/00 ,  H04N001/409

CPC classification number: G06T5/006 ,  G06K9/3283 ,  G06T3/0031 ,  H04N1/387

Abstract: Methods and systems for dewarping images allow a user to reduce distortion in scanned images. A scanned image is processed using an optics model and an illumination model, and resampled to reduce distortion. The dewarping may be improved through iterative operations where a model parameter is varied. An optimal image is obtained which corresponds to a maximum metric as a measure of the quality of a resampled image.

Abstract translation: 用于杜绝图像的方法和系统允许用户减少扫描图像中的失真。 使用光学模型和照明模型处理扫描图像，并重新采样以减少失真。 可以通过改变模型参数的迭代操作来改进杜瓦平。 获得对应于作为重采样图像的质量的度量的最大度量的最佳图像。

公开(公告)号：US20030218779A1

公开(公告)日：2003-11-27

申请号：US10153355

申请日：2002-05-22

Applicant: XEROX CORPORATION

Inventor： Beilei Xu ,  Robert Paul Loce

IPC: H04N001/405 ,  H04N001/409 ,  G06T005/00

CPC classification number: H04N1/40075

Abstract: Optimal rehalftone screen frequencies are found by searching frequency space for points that are maximally spaced from significant frequency components of an input image halftone screen or screens. Selecting a rehalftone screen having a maximally spaced frequency produces moirnull of the highest frequency possible. High frequency moirnull are visually unobjectionable. Optimal rehalftone frequencies may be found near the maximally spaced points where system or other constraints limit the usefulness of the maximally spaced points. Rehalftone screen frequencies in the range of about 1.4 to about 1.8 times the fundamental frequency of the input image halftone screen are often optimal. A rehalftone screen frequency of 1.5 times the fundamental frequency of the input image halftone screen is often optimal when the input image is monochrome and uses a dot screen.

Abstract translation: 通过搜索与输入图像半色调屏幕或屏幕的显着频率分量最大间隔的点的频率空间来找到最佳重呼频率屏幕频率。 选择具有最大间隔频率的重调频屏幕可产生最高频率的莫尔条纹。 高频莫尔条目在视觉上是无敌的。 可以在最大间隔的点附近找到最佳重复频率，其中系统或其他约束限制了最大间隔点的有用性。 通常输入图像半色调屏幕的基频的约1.4至约1.8倍的范围内的重调频屏幕频率是最佳的。 当输入图像为单色并使用点画面时，输入图像半色调屏幕的基频的1.5倍的重复频率屏幕频率通常是最佳的。