公开(公告)号：US07295703B2

公开(公告)日：2007-11-13

申请号：US10871114

申请日：2004-06-18

申请人： Raja Bala ,  Judith Stinehour ,  Gaurav Sharma

发明人： Raja Bala ,  Judith Stinehour ,  Gaurav Sharma

IPC分类号： G06K9/00 ,  G06K1/00 ,  H04N1/46

CPC分类号： H04N1/4078 ,  H04N1/6022

摘要： The present invention is directed to a method and apparatus for the improved characterization of an image scanner or similar image input terminal so as to enable the device to be employed in the measurement and analysis of color images. The invention uses a family of input device characterization targets, each varying in primary colorants and at a fixed level of black (K) colorant. A corresponding family of input device characterizations is derived, one for each level of K, and the final transformation is prepared such that the characterization includes K as an additional input—thereby improving the characterization and accuracy of the input device.

摘要翻译： 本发明涉及一种用于改进图像扫描仪或类似图像输入端子的表征的方法和装置，以便能够将该装置用于彩色图像的测量和分析。 本发明使用一系列输入设备表征目标，每个变色原色和在黑（K）着色剂的固定水平。 导出相应的输入设备特性系列，每个级别为K一个，并且准备最终变换，使得表征包括K作为附加输入，从而提高输入设备的表征和精度。

公开(公告)号：US20050281459A1

公开(公告)日：2005-12-22

申请号：US10871114

申请日：2004-06-18

申请人： Raja Bala ,  Judith Stinehour ,  Gaurav Sharma

发明人： Raja Bala ,  Judith Stinehour ,  Gaurav Sharma

IPC分类号： G06F15/00 ,  G06K9/00 ,  H04N1/407 ,  H04N1/60

CPC分类号： H04N1/4078 ,  H04N1/6022

摘要： The present invention is directed to a method and apparatus for the improved characterization of an image scanner or similar image input terminal so as to enable the device to be employed in the measurement and analysis of color images. The invention uses a family of input device characterization targets, each varying in primary colorants and at a fixed level of black (K) colorant. A corresponding family of input device characterizations is derived, one for each level of K, and the final transformation is prepared such that the characterization includes K as an additional input—thereby improving the characterization and accuracy of the input device.

摘要翻译： 本发明涉及一种用于改进图像扫描仪或类似图像输入端子的表征的方法和装置，以便能够将该装置用于彩色图像的测量和分析。 本发明使用一系列输入设备表征目标，每个变色原色和在黑（K）着色剂的固定水平。 导出相应的输入设备特性系列，每个级别为K一个，并且准备最终变换，使得表征包括K作为附加输入，从而改善输入设备的表征和精度。

公开(公告)号：US07352491B2

公开(公告)日：2008-04-01

申请号：US10641205

申请日：2003-08-14

申请人： Raja Bala ,  Gaurav Sharma ,  Robert J. Rolleston

发明人： Raja Bala ,  Gaurav Sharma ,  Robert J. Rolleston

IPC分类号： H04N1/40

CPC分类号： H04N1/603 ,  H04N1/6058

摘要： The system for selecting a best device for rendering a color document involves first determining the types of color data included in the color document to be printed. Once the type of color data has been determined, the color characteristics are matched against the strengths of the available output devices to obtain a list of devices best suited for this particular color print job. At least one device from the list of best devices is selected and the color document is rendered onto the selected device. Preferably, the types of color data involved are determined by the mix of defined colorimetry and undefined colorimetry in the color document. Alternatively, the types of color data are determined by analyzing the colorspaces in the document (i.e., RGB, CMYK, LAB, XYZ, etc.), and the embedded profiles, if any, in the document (e.g., sRGB, SWOPCMYK, Euroscale). In the instance wherein a number of devices match the criteria for selection, only those devices which honor embedded color profiles are selected for documents containing embedded profiles. Alternatively, only those devices are selected that produce a consistent rendering across multiple color spaces and profiles for documents with a mix of color spaces and profiles. Selecting the best device may also depend on whether the type of print job is considered to be Job-Balancing or Job-Splitting. With Job-Balancing, at least one of the metrics is used: (i) Intersection Gamut Volume, (ii) Gamut Similarity, or (iii) Mismatch Between Document Colors and Intersection Gamut for device selection. With Job-Splitting, at least one of these metrics are used: (i) Individual Gamut Volume, or (ii) Mismatch Between Document Colors and Device Gamut. Colorimetric definition of the selected colors can be retrieved from either an embedded source profile or by default and mapping the colors to the output gamut.

公开(公告)号：US20050036159A1

公开(公告)日：2005-02-17

申请号：US10640835

申请日：2003-08-14

申请人： Gaurav Sharma ,  Raja Bala ,  Robert Rolleston

发明人： Gaurav Sharma ,  Raja Bala ,  Robert Rolleston

IPC分类号： H04N1/60

CPC分类号： H04N1/6058 ,  H04N1/603

摘要： A method for maintaining color consistency in an environment of networked devices is disclosed. The method involves identifying a group of devices to which a job is intended to be rendered; obtaining color characteristics from devices in the identified group; modifying the job based on the obtained color characteristics; and rendering the job on one or more of the devices. More specifically, device controllers associated with each of the output devices are queried to obtain color characteristics specific to the associated output device. Preferably, the original job and the modified job employ device independent color descriptions. Modifications are computed by a transform determined by using the color characteristics of the output devices along with the content of the job itself. The method further comprises mapping colors in the original job to the output devices' common gamut, i.e., intersection of the gamuts of the individual printers wherein the color gamut of each device is obtained from a device characterization profile either by retrieving the gamut tag or by derivation using the characterization data in the profile. The color gamut of each device is computed with knowledge of the transforms that relate device independent color to device dependent color using a combination of device calibration and characterization information. Alternatively, transformations are determined dynamically based on the characteristics of the target group of output devices. From the individual color gamuts of the devices, a common intersection gamut is derived. The common intersection gamut derivation generally comprises an intersection of two three-dimensional volumes in color space. This may be performed geometrically by intersecting the surfaces representing the boundaries of the gamut volumes—which are typically chosen as triangles. Alternately, the intersection may be computed by generating a grid of points known to include all involved device gamuts. This is then mapped sequentially to each individual gamut in turn resulting in a set of points that lie within the common gamut to produce a connected gamut surface. Once the common intersection gamut is derived, the input job colors are mapped to this gamut. The optimal technique generally depends on the characteristics of the input job and the user's rendering intent. Final color correction employs a standard calorimetric transform for each output device that does not involve any gamut mapping.

公开(公告)号：US07747073B2

公开(公告)日：2010-06-29

申请号：US10997528

申请日：2004-11-24

申请人： Raja Bala ,  Gaurav Sharma

发明人： Raja Bala ,  Gaurav Sharma

IPC分类号： G06K9/00 ,  G03F3/08

CPC分类号： H04N1/603

摘要： A system and method for generating an adjusted profile for a device in response to a specified aim, where the aim may include parameters established in response to a user's specifications, for device emulation, etc.

摘要翻译： 一种用于响应于指定目的产生用于设备的经调整的简档的系统和方法，其中目的可以包括响应于用户的规范而建立的参数，用于设备仿真等。

公开(公告)号：US07328116B2

公开(公告)日：2008-02-05

申请号：US11119972

申请日：2005-05-02

申请人： Raja Bala ,  Reiner Eschbach ,  Gaurav Sharma

发明人： Raja Bala ,  Reiner Eschbach ,  Gaurav Sharma

IPC分类号： G01D18/00 ,  G01P21/00 ,  G01R35/00

CPC分类号： H04N17/04

摘要： A method is presented for deriving gamma for a display monitor that does not involve color matching tasks. The method includes displaying a test pattern to a user on the display monitor. The test pattern includes at least one of a pattern of alternating light and dark regions displayed to the user at different gamma correction levels, or a grayscale character string displayed to the user at different digital gray levels against a background of two known luminance levels. Input is received from the user as to at least one of a gamma correction level that results in the pattern of alternating light and dark regions having light and dark regions of perceived equal size, or a digital gray level for the grayscale character string that results in maximum legibility of the text string against the two known background luminance levels. Gamma is derived for the display monitor based upon the user input.

摘要翻译： 提出了一种用于导出不涉及颜色匹配任务的显示监视器的伽马的方法。 该方法包括在显示监视器上向用户显示测试图案。 测试图案包括以不同的伽马校正水平显示给用户的交替光和暗区域的模式中的至少一个，或者以两个已知亮度水平的背景在不同的数字灰度级显示给用户的灰度字符串中的至少一个。 从用户接收关于导致具有感知相同大小的亮和暗区域的交替的光和暗区域的图案的灰度校正水平或用于灰度字符串的数字灰度级中的至少一个的输入，其导致 文本串相对于两个已知背景亮度级别的最大可读性。 基于用户输入，导出用于显示监视器的伽马。

公开(公告)号：US08120812B2

公开(公告)日：2012-02-21

申请号：US10640835

申请日：2003-08-14

申请人： Gaurav Sharma ,  Raja Bala ,  Robert J. Rolleston

发明人： Gaurav Sharma ,  Raja Bala ,  Robert J. Rolleston

IPC分类号： G06F15/00

CPC分类号： H04N1/6058 ,  H04N1/603

摘要： A method for maintaining color consistency in an environment of networked devices is disclosed. The method involves identifying a group of devices to which a job is intended to be rendered; obtaining color characteristics from devices in the identified group; modifying the job based on the obtained color characteristics; and rendering the job on one or more of the devices. Modifications are computed by a transform determined by using the color characteristics of the output devices along with the content of the job itself. The method further maps colors in the original job to the output devices' common gamut, i.e., intersection of the gamuts of the individual printers wherein the color gamut of each device is obtained from a device characterization profile either by retrieving the gamut tag or by derivation using the characterization data in the profile.

摘要翻译： 公开了一种用于在网络设备的环境中维持颜色一致性的方法。 该方法涉及识别旨在呈现作业的一组设备; 从识别组中的设备获得颜色特征; 基于获得的颜色特性修改作业; 并在一个或多个设备上呈现作业。 通过使用输出设备的颜色特性以及作业本身的内容确定的变换来计算修改。 该方法进一步将原始作业中的颜色映射到输出设备的公共色域，即各个打印机的色域的相交，其中通过检索色域标签或通过衍生获得每个设备的色域，从设备表征简档 使用配置文件中的表征数据。

公开(公告)号：US20050036171A1

公开(公告)日：2005-02-17

申请号：US10641205

申请日：2003-08-14

申请人： Raja Bala ,  Gaurav Sharma ,  Robert Rolleston

发明人： Raja Bala ,  Gaurav Sharma ,  Robert Rolleston

IPC分类号： H04N1/50 ,  H04N1/56 ,  H04N1/60

CPC分类号： H04N1/603 ,  H04N1/6058

摘要： The system for selecting a best device for rendering a color document involves first determining the types of color data included in the color document to be printed. Once the type of color data has been determined, the color characteristics are matched against the strengths of the available output devices to obtain a list of devices best suited for this particular color print job. At least one device from the list of best devices is selected and the color document is rendered onto the selected device. Preferably, the types of color data involved are determined by the mix of defined colorimetry and undefined colorimetry in the color document. Alternatively, the types of color data are determined by analyzing the colorspaces in the document (i.e., RGB, CMYK, LAB, XYZ, etc.), and the embedded profiles, if any, in the document (e.g., sRGB, SWOPCMYK, Euroscale). In the instance wherein a number of devices match the criteria for selection, only those devices which honor embedded color profiles are selected for documents containing embedded profiles. Alternatively, only those devices are selected that produce a consistent rendering across multiple color spaces and profiles for documents with a mix of color spaces and profiles. Selecting the best device may also depend on whether the type of print job is considered to be Job-Balancing or Job-Splitting. With Job-Balancing, at least one of the metrics is used: (i) Intersection Gamut Volume, (ii) Gamut Similarity, or (iii) Mismatch Between Document Colors and Intersection Gamut for device selection. With Job-Splitting, at least one of these metrics are used: (i) Individual Gamut Volume, or (ii) Mismatch Between Document Colors and Device Gamut. Colorimetric definition of the selected colors can be retrieved from either an embedded source profile or by default and mapping the colors to the output gamut.

公开(公告)号：US07355752B2

公开(公告)日：2008-04-08

申请号：US10465408

申请日：2003-06-18

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

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

IPC分类号： H04N1/50 ,  H04N1/56

CPC分类号： H04N1/50 ,  G09G5/04 ,  G09G2320/0276 ,  G09G2320/0693 ,  H04N1/603

摘要： 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.

摘要翻译： 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：US20060110031A1

公开(公告)日：2006-05-25

申请号：US10997528

申请日：2004-11-24

申请人： Raja Bala ,  Gaurav Sharma

发明人： Raja Bala ,  Gaurav Sharma

IPC分类号： G06K9/00

CPC分类号： H04N1/603

摘要： A system and method for generating an adjusted profile for a device in response to a specified aim, where the aim may include parameters established in response to a user's specifications, for device emulation, etc.

摘要翻译： 一种用于响应于指定目的产生用于设备的经调整的简档的系统和方法，其中目的可以包括响应于用户的规范而建立的参数，用于设备仿真等。