公开(公告)号：US20040257595A1

公开(公告)日：2004-12-23

申请号：US10465408

申请日：2003-06-18

Applicant: Xerox Corporation

Inventor： Gaurav Sharma ,  Raja Bala ,  Jean-Pierre R.M Van de Capelle ,  Martin S. Maltz ,  Lalit K. Mestha

IPC: H04N001/50 ,  H04N001/56

CPC classification number: H04N1/50 ,  G09G5/04 ,  G09G2320/0276 ,  G09G2320/0693 ,  H04N1/603

Abstract: A color output device is generally driven by at least three independent control signals for control of its response. A desired response in device independent color space is normally obtained by employing a cascade consisting of a characterization transform and calibration transform. The calibration transform transforms input control variables into output control variables that are directly used to drive the device. Input control variables can be transformed into intermediate control variables, which can be then mapped to output control variables utilizing a two-dimensional transformation. The two-dimensional calibration architecture provides improved control functionality and flexibility.

Abstract translation: 颜色输出装置通常由至少三个独立的控制信号驱动，以控制其响应。 通常通过使用由特征变换和校准变换组成的级联来获得器件独立色彩空间中的期望响应。 校准变换将输入控制变量转换为直接用于驱动器件的输出控制变量。 输入控制变量可以转换为中间控制变量，然后可以使用二维变换将其映射到输出控制变量。 二维校准架构提供了改进的控制功能和灵活性。

公开(公告)号：US20030168582A1

公开(公告)日：2003-09-11

申请号：US10093220

申请日：2002-03-06

Applicant: Xerox Corporation

Inventor： Raja Bala ,  Lalit K. Mestha ,  Robert J. Rolleston

IPC: H01J003/14 ,  H01J005/16

CPC classification number: H04N1/6094 ,  H04N1/603

Abstract: An image transfer apparatus with a scanner and a spectrophotometric sensor interacting logically with the scanner. When the scanner scans a medium containing a color image, the spectrophotometric sensor interacts with the scanner to aid in the automatic selection of a scanner color correction corresponding to the medium being scanned.

Abstract translation: 具有扫描器和分光光度传感器的图像传送装置与扫描仪逻辑地相互作用。 当扫描仪扫描含有彩色图像的介质时，分光光度传感器与扫描仪相互作用，以帮助自动选择与被扫描介质相对应的扫描仪颜色校正。

公开(公告)号：US20040257596A1

公开(公告)日：2004-12-23

申请号：US10465457

申请日：2003-06-19

Applicant: Xerox Corporation

Inventor： Lalit K. Mestha ,  Norman W. Zeck ,  Kenneth J. Mihalyov ,  Gaurav Sharma

IPC: H04N001/50 ,  H04N001/56

CPC classification number: H04N1/6025 ,  H04N1/6055

Abstract: The present invention implements a CMYK to CMYK pre-transform in front of at least one printer to be clustered where the transform is designed to ensure that the printers addressed through the pre-transform have substantially identical output color for substantially identical input CMYK values. As one form of implementation a method is disclosed to build CMY to CMY 3D-LUTs and 1D-LUT for K using sensors in the field. Making use of a system LUTnullCMY to CMY 3D-LUT and a K to K 1D-LUTnullimproves consistency and provides a coherent control strategy and a means to provide standardized input CMY and K values in a clustered environment so that single or multiple vendor DFEs see substantially identical CMYK values.

Abstract translation: 本发明在至少一个打印机之前实现CMYK到CMYK预变换，以将变换设计成保证通过预变换寻址的打印机具有基本相同的输入CMYK值的基本相同的输出颜色。 作为实现的一种形式，公开了一种使用现场传感器构建CMY到CMY 3D-LUT和1D-LUT的方法。 利用系统LUT-CMY到CMY 3D-LUT和K至K 1D-LUT提高了一致性，并提供了一致的控制策略，并提供了一种在集群环境中提供标准化输入CMY和K值的方法，使单个或多个 供应商DFE看到基本相同的CMYK值。

公开(公告)号：US20040136015A1

公开(公告)日：2004-07-15

申请号：US10342873

申请日：2003-01-15

Applicant: XEROX CORPORATION

Inventor： Jean-Pierre R.M. Van de Capelle ,  Lalit K. Mestha ,  Robert P. Loce ,  Raja Bala ,  Martin S. Maltz ,  Peter A. Crean

IPC: H04N001/60 ,  H04N001/52

CPC classification number: H04N1/4078 ,  H04N1/6033

Abstract: A system and method for printer control and color balance calibration. The system and method address the image quality problems of print engine instability, low quality of color balance and contouring from the calibration. The method includes defining combinations of colorants, such as inks or toners that will be used to print images, defining a desired response for the combinations that are to be used and, in real time, iteratively printing CMY halftone color patches, measuring the printed patches via an in situ sensor and iteratively performing color-balance calibration based on the measurements, accumulating corrections until the measurements are within a predetermined proximity of the desired response. The calibration is performed on the halftones while they are in a high quantization resolution form.

Abstract translation: 一种用于打印机控制和色平衡校准的系统和方法。 该系统和方法解决了打印引擎不稳定的图像质量问题，色彩平衡质量差和校准轮廓。 该方法包括定义着色剂的组合，例如将用于打印图像的油墨或调色剂，为要使用的组合定义期望的响应，并且实时迭代地打印CMY半色调色块，测量印刷的贴片 通过原位传感器并且基于测量迭代地执行色平衡校准，累积校正直到测量值在所需响应的预定接近度内。 校准在半色调上进行，而它们处于高量化分辨率形式。

公开(公告)号：US20030086103A1

公开(公告)日：2003-05-08

申请号：US09985419

申请日：2001-11-02

Applicant: Xerox Corporation

Inventor： Lalit K. Mestha ,  Eli S. Saber

IPC: B41J001/00

CPC classification number: H04N1/6033 ,  G03G2215/00042

Abstract: A multiple-LED sensor is used to detect area coverage of marked patches on a marking substrate. The same sensor may also be used for color calibration. The marking substrate area coverage sensor obtains reflectance measurements from marked patches of a marking substrate. For example, the marked patches may be patches of a marking substance such as toner, ink or paint, or patches marked by etching or the like. A Neugebauer model may be used to obtain the reflectance measurements. A batch least squares algorithm may be used to estimate the appropriate parameters of the Neugebauer model. For improved accuracy, a recursive least squares algorithm may be used. The recursive least squares algorithm allows the marking substrate area coverage sensor to calibrate itself to changes in the sensing environment.

Abstract translation: 多LED传感器用于检测标记基板上标记贴片的面积。 同样的传感器也可以用于颜色校准。 标记衬底区域覆盖传感器从标记衬底的标记贴片获得反射率测量值。 例如，标记的贴片可以是标记物质的补片，例如调色剂，墨水或油漆，或者通过蚀刻等标记的贴片。 可以使用Neugebauer模型来获得反射率测量。 可以使用批量最小二乘法来估计Neugebauer模型的适当参数。 为了提高精度，可以使用递归最小二乘法算法。 递归最小二乘算法允许标记衬底区域覆盖传感器自身校准感测环境中的变化。

公开(公告)号：US20030063275A1

公开(公告)日：2003-04-03

申请号：US09949475

申请日：2001-09-10

Applicant: Xerox Corporation

Inventor： Fred F. Hubble III ,  Tanya L. Love ,  Lalit K. Mestha ,  Gary W. Skinner ,  Dennis M. Diehl ,  Robert E. Grace ,  Eric Jackson ,  Yao Rong Wang

IPC: G01J003/46

CPC classification number: G01J3/50 ,  G01J3/501 ,  G01J3/52 ,  G01J3/524

Abstract: In a color analysis system in which sheets with multiple different color printed test patches are moved relative to a color analyzing spectrophotometer, and in which fiducial marks are printed adjacent to respective test patches and optically detected by a fiducial mark detector to provide a triggering system for the respective test patch analysis, there is provided automatic diagnostic testing of the spectrophotometer and the fiducial mark triggering system, including automatically generating special test sheets, some of which may include test areas of varying density black.

Abstract translation: 在一种颜色分析系统中，其中具有多个不同颜色的印刷测试片的片相对于颜色分析分光光度计移动，并且其中基准标记被印刷在相应的测试片附近并由基准标记检测器光学检测以提供触发系统 相应的贴片分析，提供了分光光度计和基准标记触发系统的自动诊断测试，包括自动生成特殊测试片，其中一些可能包括不同密度黑色的测试区域。

公开(公告)号：US20040141193A1

公开(公告)日：2004-07-22

申请号：US10348263

申请日：2003-01-21

Applicant: XEROX CORPORATION

Inventor： Lalit K. Mestha

IPC: H04N001/60 ,  H04N001/50

CPC classification number: H04N1/60 ,  H04N1/6033

Abstract: The color management system comprises a state-space based model for a pixel element in a dynamically varying color marking device. A sensor measures the color of the printed output for construction of a selected set of sensitivity functions representative of color output relating to inputs. The gradients of the sensitivity functions are extracted and used to develop the corresponding discrete multivariable state-space model of the pixel element. More particularly, the model is constructed from the Jacobian matrix characterizing a change in measured color output for a change in input color values of the pixel. Extension of modeling methodology for a single pixel is applied to multiple pixel elements.

Abstract translation: 颜色管理系统包括基于状态空间的模型，用于动态变化的颜色标记装置中的像素元件。 传感器测量打印输出的颜色，以构建表示与输入相关的颜色输出的所选择的一组灵敏度函数。 提取灵敏度函数的梯度，并用于开发像素元素的相应离散多变量状态空间模型。 更具体地，该模型由雅可比矩阵构成，其表征用于像素的输入颜色值的变化的测量的颜色输出的变化。 将单个像素的建模方法的扩展应用于多个像素元素。

公开(公告)号：US20020191189A1

公开(公告)日：2002-12-19

申请号：US09994666

申请日：2001-11-28

Applicant: Xerox Corporation

Inventor： Lalit K. Mestha ,  Fred F. Hubble III ,  Tonya L. Love ,  Daniel A. Robbins ,  Gary W. Skinner

IPC: G01J003/46

CPC classification number: G01J3/02 ,  G01J3/0208 ,  G01J3/50 ,  G01J3/501 ,  G01J3/504 ,  G01J3/513 ,  G01J3/52 ,  G01J3/524

Abstract: A method is provided for measuring the color of irregular surface materials, including textiles which may provide dissimilar color measurements from different viewing angles, by illuminating a sampling area of the irregular surface material approximately perpendicularly thereto and measuring the color reflected from that area at a substantial angle, preferably about 45 degrees, with a plurality of separate photodetectors arrayed circularly around the illuminated sampling area of irregular surface material to receive the reflected illumination from substantially opposing directions and at a substantial angle to the illuminated area, for providing a more accurate yet lower cost color measurement system for textiles that can be used easily, quickly, and uncritically in terms of the handling, positioning and orientation of the textile material being tested.

Abstract translation: 提供了一种用于测量不规则表面材料的颜色的方法，所述不规则表面材料包括可以通过照射垂直于其的不规则表面材料的采样区域并且以大体上的方式测量从该区域反射的颜色来从不同的视角提供不同的颜色测量的纺织品 角度，优选约45度，多个单独的光电探测器围绕照射的不规则表面材料的采样区域循环地排列，以从基本上相对的方向接收反射的照明，并以与照明区域相当的角度接收反射照明，以提供更准确但更低的 用于纺织品的成本色彩测量系统，可以在被测试的纺织材料的处理，定位和取向方面容易，快速和不加批判地使用。

公开(公告)号：US20040012817A1

公开(公告)日：2004-01-22

申请号：US10196837

申请日：2002-07-16

Applicant: XEROX CORPORATION

Inventor： Grace T. Brewington ,  Peter A. Crean ,  Lalit K. Mestha ,  Gary W. Skinner

IPC: H04N001/405

CPC classification number: H04N1/40006 ,  H04N1/4076 ,  H04N1/6097

Abstract: In an image rendering system, a method of compensating for system performance changes related to image attributes includes rendering a diagnostic image, sensing at least one image quality from the diagnostic image, updating an image attribute compensation tone reproduction curve based on the sensed image quality and rendering an image based on the updated image attribute compensation tone reproduction curve. For example, image attributes include print media type and a halftone screen selection. An image processing system operative to perform the method of compensation includes a set of image attribute compensation tone reproduction curves. Each curve of the set is associated with a particular combination of image attributes. For example, each curve is associated with a particular media type/halftone screen combination.

Abstract translation: 在图像渲染系统中，补偿与图像属性相关的系统性能改变的方法包括渲染诊断图像，从诊断图像感测至少一个图像质量，基于感测图像质量更新图像属性补偿色调再现曲线，以及 基于更新的图像属性补偿色调再现曲线渲染图像。 例如，图像属性包括打印介质类型和半色调屏幕选择。 可执行补偿方法的图像处理系统包括一组图像属性补偿色调再现曲线。 该集合的每个曲线与图像属性的特定组合相关联。 例如，每个曲线与特定的媒体类型/半色调屏幕组合相关联。

公开(公告)号：US20030081214A1

公开(公告)日：2003-05-01

申请号：US10000379

申请日：2001-10-31

Applicant: XEROX CORPORATION

Inventor： Lalit K. Mestha ,  Yao Rong Wang ,  Kenneth J. Mihalyov

IPC: G01J003/46

CPC classification number: G01J3/46 ,  G01J3/463 ,  G01J3/524

Abstract: A color sensor monitors the output of a color producing process and produces a signal representative of a color produced by the color producing process. The signal can be used as feedback signal to control the process. Occasionally, the color sensor signal includes a component representing a transient error. A system model of the color producing process is used to predict reasonable sensor signals. A comparison of the sensor signal with the predicted sensor signals is used to determine if the sensor signal is reasonable. If the sensor signal is unreasonable, a substitute signal is used as the feedback signal to the control process. The substitute signal can be a predicted sensor signal or a signal based on historical system performance data.