公开(公告)号：US20040257619A1

公开(公告)日：2004-12-23

申请号：US10462966

申请日：2003-06-17

Applicant: Xerox Corporation

Inventor： Robert P. Loce ,  Martin S. Maltz ,  Jay S. Grzenda

IPC: H04N001/52 ,  G06T007/00

CPC classification number: H04N1/40075

Abstract: What is disclosed is an image path that advantageously uses halftone classification to select appropriate mappings in gray-scale management and color management operations. The tags generated in the scanner help identify different classes of halftones. One is selected from several pixel-value mappings to provide proper compensation. That is, the one-dimensional and multi-dimensional pixel-value mappings within the color management module are selected based on halftone classification tags from the scanner. The tagging is either one bit that indicates nullLow Frequency Halftonenull and nullNot LFHTnull, or, more preferably, the tag is multi-bit indicating a frequency bin that contains the frequency of the input halftone. Additionally, the multi-bit tag can indicate particular halftone screen types, such as dot screens, line screens, stochastic screens or error diffusion. The pixel value mappings are typically implemented as Look-Up Tables (LUTs), and the LUTs of the present invention are optimized for the various halftone classes. Generation of the LUTs, or other pixel-value mappings, is non-trivial in that such mappings are normally applied to contone images and not to blurred halftoned images. The pixel-value mappings of the present invention are derived via an iterative process. Alternatively, a model for this modulated image type is used.

Abstract translation: 公开的是图像路径，其有利地使用半色调分类来选择灰度管理和颜色管理操作中的适当映射。 扫描仪中生成的标签有助于识别不同类别的半色调。 从几个像素值映射中选择一个来提供适当的补偿。 也就是说，基于来自扫描仪的半色调分类标签来选择颜色管理模块内的一维和多维像素值映射。 标签是指示“低频半色调”和“不LFHT”的一个位，或者更优选地，标签是多位，指示包含输入半色调的频率的频率仓。 此外，多位标签可以指示特定的半色调屏幕类型，例如点屏幕，线屏幕，随机屏幕或错误扩散。 像素值映射通常被实现为查找表（LUT），并且本发明的LUT针对各种半色调类进行了优化。 LUT的生成或其他像素值映射是不重要的，因为这样的映射通常被应用于连续色调图像而不是模糊的半色调图像。 本发明的像素值映射通过迭代处理得到。 或者，使用用于该调制图像类型的模型。

公开(公告)号：US20040179090A1

公开(公告)日：2004-09-16

申请号：US10812545

申请日：2004-03-29

Applicant: Xerox Corporation

Inventor： R. Victor Klassen ,  Stephen C. Morgana ,  Robert P. Loce ,  Michael Branciforte ,  Daniel R. Maurer ,  Michael J. Martin ,  Robert M. Lofthus

IPC: B41J002/47

CPC classification number: B41J2/471

Abstract: A method for rendering a raster output level determines an image position of a pixel of interest (POI) within an image. An intended raster output level, which corresponds to the POI, is received into a processing device. A final raster input level is determined as a function of the image position and the intended raster output level. The final input level and the image position are transmitted to an output device. An actual raster output level is rendered, via the output device, at a position on an output medium corresponding to the image position. The actual raster output level substantially matches the intended raster output level.

Abstract translation: 用于渲染光栅输出电平的方法确定图像内的感兴趣像素（POI）的图像位置。 对应于POI的预期光栅输出电平被接收到处理设备中。 根据图像位置和预期的光栅输出电平确定最终光栅输入电平。 最终输入电平和图像位置被发送到输出设备。 通过输出设备，在对应于图像位置的输出介质上的位置处渲染实际的光栅输出电平。 实际光栅输出电平基本上与预期的光栅输出电平相匹配。

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：US20030058474A1

公开(公告)日：2003-03-27

申请号：US09962904

申请日：2001-09-25

Applicant: XEROX CORPORATION

Inventor： Robert P. Loce ,  Xiaoxue Cheng ,  Gregory W. Zack

IPC: H04N001/405 ,  H04N001/40

CPC classification number: G06K15/02 ,  G06K15/1807

Abstract: Characteristics of text or text components or features are considered when selecting halftoning screens. For example, an italic slant angle of text is recognized and used to select or generate a compatible halftone screen oriented at the same angle. A screen frequency may be selected based on a thickness of a text component. Descriptive tags associated with text or text components facilitate screen selection. Tags are assigned based on font descriptions included in a document during authoring. Alternatively, tags are assigned based on the results of document segmentation and character recognition techniques. An image processing system operative to consider characteristics of text or text components when selecting halftone screens includes a text component characteristic recognizer, a halftone screen selector and a halftoner. Optionally a print engine is also included. In a xerographic environment the print engine includes a xerographic printer.

Abstract translation: 当选择半色调屏幕时，会考虑文本或文本组件或特征的特征。 例如，文本的斜体斜角被识别并用于选择或生成以相同角度定向的兼容半色调屏幕。 可以基于文本分量的厚度来选择屏幕频率。 与文本或文本组件关联的描述性标签便于屏幕选择。 标签根据创作期间文档中包含的字体说明进行分配。 或者，基于文档分割和字符识别技术的结果分配标签。 当选择半色调网屏时，可以考虑文本或文本成分的特征的图像处理系统包括文本成分特征识别器，半色调屏幕选择器和半色调。 可选地，还包括打印引擎。 在静电复印环境中，打印引擎包括静电印刷机。

公开(公告)号：US20030002739A1

公开(公告)日：2003-01-02

申请号：US10187924

申请日：2002-07-01

Applicant: Xerox Corporation

Inventor： Robert P. Loce ,  Jeffrey D. Kingsley

IPC: G06K009/00 ,  G06T005/00 ,  G06K015/02 ,  G06K009/64 ,  H04N001/409 ,  G06K009/68

CPC classification number: H04N1/40068 ,  G06T5/20 ,  H04N1/40037

Abstract: The present invention is a method and apparatus for improving the appearance of electronic images, and more specifically, to the efficient use of template rotation within a template matching process to enhance such images. The invention reduces the number of entries that are stored in a look up table by eliminating identical patterns that differ only by the angle at which they are output. The appropriate templates are then rotated it by the required angle for output subsequent to their retrieval from the lookup table.

公开(公告)号：US20040071348A1

公开(公告)日：2004-04-15

申请号：US10268394

申请日：2002-10-09

Applicant: Xerox Corporation

Inventor： Steven J. Harrington ,  Robert P. Loce ,  Gaurav Sharma

IPC: G06K009/36

CPC classification number: B44F1/10 ,  G02B27/06

Abstract: Methods and apparatus for spectrally-encoding plural source images and for providing the spectrally-encoded plural source images in a composite image, for rendering the composite image in a physical form, or for recovering at least one of the encoded source images from the rendered composite image such that the recovered source image is made distinguishable. The rendered composite image may be subjected to a varying field of illumination, generated, for example, by a switched sequence of individually activated, differing illuminants. This sequenced array of illuminants causes a corresponding sequence of source images to be recovered in rapid succession, thus imparting a sense of change, such as motion, between or within the recovered source images.

Abstract translation: 用于频谱编码多个源图像并用于在合成图像中提供频谱编码的多个源图像的方法和装置，用于以物理形式呈现合成图像，或用于从所渲染的复合物中恢复至少一个编码源图像 使得恢复的源图像是可区分的。 渲染的合成图像可以经受例如通过单独激活的不同光源的切换序列产生的变化的照明场。 这种排序的发光体阵列使得能够快速连续地恢复相应的源图像序列，从而在恢复的源图像之间或之内赋予诸如运动的变化感。

公开(公告)号：US20040071339A1

公开(公告)日：2004-04-15

申请号：US10268246

申请日：2002-10-09

Applicant: Xerox Corporation

Inventor： Robert P. Loce ,  Yeqing Juliet Zhang ,  Gaurav Sharma ,  Steven J. Harrington

IPC: G06K009/00

CPC classification number: H04N1/4446

Abstract: Methods and apparatus for spectrally-encoding plural source images and for providing the spectrally-encoded plural source images in a composite image, for rendering the composite image on a substrate, or for recovering at least one of the encoded source images from the rendered composite image such that the recovered source image is made distinguishable. The rendered composite image includes at least a first source image that is encoded and rendered with use of a selected colorant so as to be visually discernible on the substrate during a plurality of modes of intended illumination as a nullbackgroundnull image, and a second, nullnarrow bandnull source image that is encoded in the composite image so as to be recovered when illuminated by at least a selected of the plurality of modes of intended illumination that employs complementary narrow band illuminant.

Abstract translation: 用于频谱编码多个源图像并用于在合成图像中提供频谱编码的多个源图像的方法和装置，用于在基板上渲染合成图像，或用于从所渲染的合成图像中恢复至少一个编码源图像 使得恢复的源图像是可区分的。 所渲染的合成图像至少包括使用选定的着色剂编码和渲染的第一源图像，以便在作为“背景”图像的预定照明的多个模式期间在基板上在视觉上可辨别， 在合成图像中被编码的“窄带”源图像，以便在使用补充窄带光源的多个预期照明模式中的至少一个选择的照明下被恢复。

公开(公告)号：US20040071310A1

公开(公告)日：2004-04-15

申请号：US10268575

申请日：2002-10-09

Applicant: Xerox Corporation

Inventor： Gaurav Sharma ,  Yeqing Zhang ,  Robert P. Loce ,  Steven J. Harrington

IPC: G06K009/00 ,  G06K009/36

CPC classification number: H04N1/4446

Abstract: Methods and apparatus for spectrally-encoding plural source images and for providing the spectrally-encoded plural source images in a composite image, for rendering the composite image in a physical form, or for recovering at least one of the encoded source images from the rendered composite image such that the recovered source image is made distinguishable. Source image confusion in a rendered composite image is controlled by application of a multi-illuminant gray component replacement (GCR) technique to the darkness common to the different colorants under the multiple illuminants.

Abstract translation: 用于频谱编码多个源图像并用于在合成图像中提供频谱编码的多个源图像的方法和装置，用于以物理形式呈现合成图像，或用于从所渲染的复合物中恢复至少一个编码源图像 使得恢复的源图像是可区分的。 渲染合成图像中的源图像混淆是通过将多光源灰分成分替换（GCR）技术应用于在多个光源下的不同着色剂通用的黑暗来控制的。

公开(公告)号：US20030048478A1

公开(公告)日：2003-03-13

申请号：US09947838

申请日：2001-09-05

Applicant: Xerox Corporation

Inventor： Shirley Cheng ,  Mark A. Gwaltney ,  Robert P. Loce ,  Martin S. Maltz ,  Connie F. Purdum

IPC: H04N001/405 ,  G06K015/00 ,  G03F003/08

CPC classification number: H04N1/4078

Abstract: Method, system and computer-readable medium containing instructions for performing halftone gamma correction in a printing environment to achieve and maintain high print quality. The system includes one or more subsystems, including a tone reproduction subsystem that creates one or more print calibration pages, each having a tone curve defining a relationship between a plurality of input color levels, output color levels and a level of measured darkness. A pixel adjustment subsystem associates each input color level with one of the output color levels based on a desired percentage change in the level of measured darkness. Further, a gamma correction system performs gamma correction on a selected tone curve of one of the print calibration pages by associating each input color level with one of the output color levels based on the desired percentage change in the level of measured darkness in a substantially flat region of the selected tone curve.

Abstract translation: 包含用于在打印环境中执行半色调伽马校正的指令以实现和保持高打印质量的方法，系统和计算机可读介质。 该系统包括一个或多个子系统，包括创建一个或多个打印校准页面的色调再现子系统，每个打印校准页面具有定义多个输入颜色级别，输出颜色级别和测量黑暗级别之间的关系的色调曲线。 像素调整子系统基于所测量的黑暗级别的期望百分比变化将每个输入颜色级别与输出颜色级别之一相关联。 此外，伽马校正系统通过将每个输入颜色级别与输出颜色级别之一相关联，基于在基本平坦的测量黑暗级别中的期望百分比变化，对所选择的打印校准页面之一的色调曲线进行伽马校正 所选色调曲线的区域。

公开(公告)号：US20010038460A1

公开(公告)日：2001-11-08

申请号：US09870304

申请日：2001-05-30

Applicant: Xerox Corporation

Inventor： Robert P. Loce ,  Michael Branciforte ,  Ying-Wei Lin

IPC: B41B001/00

CPC classification number: G06T5/20 ,  H04N1/58

Abstract: A method for processing digital images to be displayed, stored, or printed, to eliminate blooming and other artifacts. The system utilizes morphological processes to isolate and modify image structures susceptible to marking process artifacts and then combines the modified image structures with the input image to produce a printable image that may be rendered on a given printer.