公开(公告)号：US20030050768A1

公开(公告)日：2003-03-13

申请号：US09941774

申请日：2001-08-30

Applicant: XEROX CORPORATION

Inventor： Lingappa K. Mestha ,  Sohail A. Dianat

IPC: H03F001/26 ,  G06F015/00 ,  H04B015/00

CPC classification number: G01J3/46 ,  G01J3/462 ,  G01J3/501 ,  G01J3/524 ,  G01J2003/467

Abstract: An LED-based spectrophotometer uses a reconstruction algorithm, based on the spectral characteristics of the illumination source and the color sensing system, to convert integrated multiple illuminant measurements from a non-fully illuminant populated color sensor into a fully populated spectral curve using a reference database. The reference database contains training samples that indicate reflectance spectra and their corresponding LED sensor output. A dynamic, Karhunen-Loeve-based (DKL) spectral reconstruction algorithm, used to reconstruct spectra, gives greater importance to the data from the training samples in the neighborhood of the color sample under measurement. This is done using linear operators and basis vectors.

公开(公告)号：US20020191183A1

公开(公告)日：2002-12-19

申请号：US09862247

申请日：2001-05-22

Applicant: Xerox Corporation

Inventor： Jagdish C. Tandon ,  Lingappa K. Mestha

IPC: G01J003/42

CPC classification number: G01J3/02 ,  G01J3/0208 ,  G01J3/501 ,  G01J3/51 ,  G01J3/513 ,  G01J3/52 ,  G01J3/524 ,  G03G15/01 ,  G03G2215/00063 ,  G03G2215/00067 ,  H04N1/6033

Abstract: An improved and lower cost color spectrophotometer, especially suitable for on-line color printer color control systems, incorporating a low cost commercial imaging chip, which normally only forms part of a three row, three color, document imaging bar used for imaging documents in scanners, digital copiers, or multifunction products, having multiple photo-sites with at least three different color filters in three rows. This multiple photo-sites chip may be modified to also provide unfiltered photo-sites. This spectrophotometer may have a substantially reduced number of different LED or other spectral illumination sources, one of which may be for white light, yet provide multiple spectral data outputs from the differently filtered photo-sites being simultaneous illuminated by the light reflected from a color test target area which is being sequentially illuminated by the respective limited number of LEDs, enabling broad spectrum information and color control.

Abstract translation: 一种改进且成本较低的彩色分光光度计，特别适用于在线彩色打印机色彩控制系统，结合了低成本的商业成像芯片，通常仅形成扫描仪中成像文档的三行三色文档成像条的一部分 ，数字复印机或多功能产品，具有三行具有至少三种不同滤色片的多个照片位置。 可以修改该多个照片位置芯片，以提供未过滤的照片位置。 该分光光度计可以具有基本上减少数量的不同的LED或其它光谱照明源，其中一个可以用于白光，但是提供来自不同滤光的光点的多个光谱数据输出，由来自颜色测试反射的光同时照亮 目标区域由相应有限数量的LED顺序地照亮，从而实现广谱信息和颜色控制。

公开(公告)号：US20030132982A1

公开(公告)日：2003-07-17

申请号：US10377910

申请日：2003-02-28

Applicant: Xerox Corporation

Inventor： Jagdish C. Tandon ,  Lingappa K. Mestha

IPC: B41J029/393

CPC classification number: G01J3/02 ,  G01J3/0208 ,  G01J3/501 ,  G01J3/51 ,  G01J3/513 ,  G01J3/52 ,  G01J3/524 ,  G03G15/01 ,  G03G2215/00063 ,  G03G2215/00067 ,  H04N1/6033

Abstract: An improved and lower cost color spectrophotometer, especially suitable for on-line color printer color control systems, incorporating a low cost commercial imaging chip, which normally only forms part of a three row, three color, document imaging bar used for imaging documents in scanners, digital copiers, or multifunction products, having multiple photo-sites with at least three different color filters in three rows. This multiple photo-sites chip may be modified to also provide unfiltered photo-sites. This spectrophotometer may have a substantially reduced number of different LED or other spectral illumination sources, one of which may be for white light, yet provide multiple spectral data outputs from the differently filtered photo-sites being simultaneous illuminated by the light reflected from a color test target area which is being sequentially illuminated by the respective limited number of LEDs, enabling broad spectrum information and color control.

公开(公告)号：US20030055611A1

公开(公告)日：2003-03-20

申请号：US09941858

申请日：2001-08-30

Applicant: Xerox Corporation

Inventor： Lingappa K. Mestha ,  Sohail A. Dianat

IPC: H03F001/26 ,  G06F015/00 ,  H04B015/00

CPC classification number: G01J3/52 ,  G01J3/28 ,  G01J3/501 ,  G01J3/524

Abstract: An LED-based spectrophotometer uses a reconstruction algorithm, based on spectral information of an illumination source and a reference spectrophotometer, to convert integrated multiple illuminant measurements from a non-fully illuminant populated color sensor into a fully populated spectral curve using a reference database. A dynamic, Least Squares-based spectral reconstruction algorithm, used to reconstruct spectra, gives greater importance to the data from the reference database in the neighborhood of the color sample under measurement. This is done using linear operators.

Abstract translation: 基于LED的分光光度计使用基于照明源和参考分光光度计的光谱信息的重建算法，使用参考数据库将来自非完全照明的填充颜色传感器的集成多个光源测量值转换为完全填充的光谱曲线。 用于重建光谱的基于动态，最小二乘法的光谱重建算法对于测量中颜色样本附近的参考数据库的数据更为重要。 这是使用线性运算符完成的。

公开(公告)号：US20020196437A1

公开(公告)日：2002-12-26

申请号：US09863042

申请日：2001-05-22

Applicant: Xerox Corporation

Inventor： Jagdish C. Tandon ,  Lingappa K. Mestha ,  Fred F. Hubble III

IPC: G01J003/42

CPC classification number: H04N1/6033 ,  G01J3/501 ,  G01J3/513 ,  G01J3/524 ,  G03G15/01 ,  G03G2215/00063 ,  G03G2215/00067

Abstract: A color spectrophotometer incorporating a low cost commercial imaging chip, which normally forms part of a document imaging bar used for imaging documents in scanners, etc., having multiple photo-sites with three different rows of color filters. Each chip is mounted on the optical axis of an imaging lens system, in the image plane of that lens system, to image the reflected illumination from an illuminated color test target area on the chip. The optical axis of the imaging lens system is oriented at 45null to the illuminated color test patches, and the photodetector chip is physically mounted perpendicular to the plane of the illuminated color test patches. Respective photo-sensor chips and associated 1:1 optics may be mounted on opposing sides of the spectrophotometer physically oriented at 90null to the test target area plane receiving the reflected light from the test target optically oriented at 45null to the illuminated test target.

Abstract translation: 一种彩色分光光度计，其结合了低成本的商业成像芯片，其通常构成用于在扫描仪等中成像文档的文档成像条的一部分，具有具有三个不同行彩色滤光片的多个光照位置。 每个芯片安装在成像透镜系统的光轴上，在该透镜系统的图像平面中，以对来自芯片上的被照亮颜色测试对象区域的反射照明进行成像。 成像透镜系统的光轴与被照明的彩色测试贴片定向成45°，并且光电检测器芯片物理地安装成垂直于被照亮的彩色测试贴片的平面。 相应的光传感器芯片和相关的1：1光学器件可以安装在分光光度计的相对侧上，物理地定向为90°，接收来自与照明测试目标以45°光学定向的测试对象的反射光的测试对象区域平面。

公开(公告)号：US20020093684A1

公开(公告)日：2002-07-18

申请号：US09731207

申请日：2000-12-06

Applicant: XEROX CORPORATION

Inventor： Jan Bares ,  Michael R. Furst ,  Lingappa K. Mestha ,  Steven J. Harrington ,  Eric Jackson

IPC: G06F015/00 ,  B41J001/00

CPC classification number: G06T11/001 ,  G06K1/123

Abstract: A printing system accurately prints proprietary marks and selected colors. A dictionary of recognizable patterns and defined colors corresponding to the proprietary marks and selected colors is linked to a user interface wherein a user may designate a location within a document and at least one of the proprietary marks with defined colors from an accessible menu. A processor associates the defined colors with the image at the specified location and generates a printer signal representative thereof. Alternatively, the processor includes a pattern recognizer for identifying recognizable patterns within a document. The patterns have a likeness to defined patterns within a pattern dictionary and can be converted to the defined patterns for display or imaging.

Abstract translation: 打印系统准确地打印专有标记和选定的颜色。 与专有标记和所选择的颜色相对应的可识别图案和定义的颜色的字典被链接到用户界面，其中用户可以从可访问的菜单指定文档内的位置和具有定义颜色的专有标记中的至少一个。 处理器将定义的颜色与指定位置处的图像相关联，并产生代表其的打印机信号。 或者，处理器包括用于识别文档内的可识别图案的图案识别器。 这些图案与图案字典中定义的图案具有相似性，并且可以转换为定义的图案以进行显示或成像。

公开(公告)号：US20030086090A1

公开(公告)日：2003-05-08

申请号：US10309703

申请日：2002-12-04

Applicant: Xerox Corporation

Inventor： Jagdish C. Tandon ,  Lingappa K. Mestha ,  Fred F. Hubble III

IPC: G01N021/25

CPC classification number: H04N1/6033 ,  G01J3/501 ,  G01J3/513 ,  G01J3/524 ,  G03G15/01 ,  G03G2215/00063 ,  G03G2215/00067

Abstract: A color spectrophotometer incorporating a low cost commercial imaging chip, which normally forms part of a document imaging bar used for imaging documents in scanners, etc., having multiple photo-sites with three different rows of color filters. Each chip is mounted on the optical axis of an imaging lens system, in the image plane of that lens system, to image the reflected illumination from an illuminated color test target area on the chip. The optical axis of the imaging lens system is oriented at 45null to the illuminated color test patches, and the photodetector chip is physically mounted perpendicular to the plane of the illuminated color test patches. Respective photo-sensor chips and associated 1:1 optics may be mounted on opposing sides of the spectrophotometer physically oriented at 90null to the test target area plane receiving the reflected light from the test target optically oriented at 45null to the illuminated test target.

公开(公告)号：US20030007154A1

公开(公告)日：2003-01-09

申请号：US09888791

申请日：2001-06-25

Applicant: Xerox Corporation

Inventor： Jagdish C. Tandon ,  Lingappa K. Mestha

IPC: G01J003/51

CPC classification number: G01J3/51 ,  G01J3/501 ,  G01J3/513 ,  G01J3/52 ,  G01J3/524 ,  G03G15/01 ,  G03G2215/00063

Abstract: A low cost yet higher speed color spectrophotometer, especially suitable for on-line color printer color control systems, wherein multiple test patches of different colors may be simultaneously illuminated and substantially simultaneously discretely color analyzed. Reduced numbers of test print sheets, with multiple sets of multiple small adjacent different color test patches, may be used. Reflected images of the multiple different color test patches may be simultaneously focused on different areas of a photodetector chip to expose differently color responsive sets of multiple photo-sites to provide plural discrete color signals for each different color test patch image.