公开(公告)号：US08477374B2

公开(公告)日：2013-07-02

申请号：US12894475

申请日：2010-09-30

Applicant: Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

Inventor： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC: H04N1/60

CPC classification number: H04N1/6033

Abstract: Systems and methods are described that facilitate reducing a number of patches used in characterizing a color halftone printer via a binary color printer model. A binary printer model involves printing of a fundamental set of color binary patterns that encompass all possible halftone outputs. A k-center clustering technique is employed to automatically find and eliminate redundancies in the initial set of binary color patterns. Once the number of patches is reduced to an acceptable number, a multiplicative reflectance model is applied that better approximates the physical process and therefore improves accuracy.

Abstract translation: 描述了有助于通过二进制彩色打印机模型减少用于表征彩色半色调打印机的多个补丁的系统和方法。 二进制打印机模型涉及打印包含所有可能的半色调输出的基本颜色二进制图案集。 采用k-中心聚类技术来自动寻找和消除初始二值颜色图案集中的冗余。 一旦将补片的数量减少到可接受的数量，则应用更好地逼近物理过程并因此提高准确度的乘法反射率模型。

公开(公告)号：US08339674B2

公开(公告)日：2012-12-25

申请号：US13300845

申请日：2011-11-21

Applicant: Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

Inventor： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC: H04N1/401 ,  H04N1/405 ,  H04N1/407 ,  H04N1/50 ,  H04N1/52 ,  H04N1/60 ,  G03F3/10

CPC classification number: G06K15/02 ,  G06K15/027 ,  H04N1/52 ,  H04N1/6027 ,  H04N1/6033

Abstract: A method and apparatus are provided for compensating for spatial non-uniformities in a printer by deriving a true spatial non-uniformity tone response curve (TRC) that characterizes the printer in terms of color output variation for each addressable pixel location in a spatial range. The “true average” tone response curve is determined for a color channel. A prediction of the true response as a function of the spatial location is derived by printing and scanning a specially designed halftone-independent target of binary patterns. The predicted tone response curve for each color channel and halftone is predicted using a binary printer model, wherein the “predicted tone response curve” provides a model based approximation of the actual response for each addressable pixel location in the spatial range. Also stored is an “average predicted tone response” by averaging the “predicted tone response curve” over the spatial range of the printer.

Abstract translation: 提供了一种方法和装置，用于通过根据空间范围内的每个可寻址像素位置的颜色输出变化导出表征打印机的真实空间不均匀色调响应曲线（TRC）来补偿打印机中的空间非均匀性。 确定颜色通道的真实平均色调响应曲线。 作为空间位置的函数的真实响应的预测是通过打印和扫描专门设计的与二元模式无关的目标的二进制模式得出的。 使用二进制打印机模型来预测每个颜色通道和半色调的预测色调响应曲线，其中预测色调响应曲线为空间范围中的每个可寻址像素位置提供基于模型的近似实际响应。 还通过在打印机的空间范围上平均预测的音调响应曲线来存储平均预测的音调响应。

公开(公告)号：US08072648B2

公开(公告)日：2011-12-06

申请号：US11881263

申请日：2007-07-26

Applicant: Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

Inventor： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC: H04N1/401 ,  H04N1/405 ,  H04N1/407 ,  H04N1/50 ,  H04N1/52 ,  H04N1/60 ,  G03F3/10

CPC classification number: G06K15/02 ,  G06K15/027 ,  H04N1/52 ,  H04N1/6027 ,  H04N1/6033

Abstract: The predicted tone response curve for each color channel and halftone is predicted using a binary printer model and stored, wherein the “predicted tone response curve” provides a model based approximation of the actual response for the printer for each addressable pixel location in the spatial range. Also stored is an “average predicted tone response” by averaging the “predicted tone response curve” over the spatial range of the printer. With the “true average” tone response curve, the “predicted tone response curve”, and the “average predicted tone response curve”, an estimate of the true tone response curve for the color channel can then be mathematically obtained, wherein the true tone response curve defines a predicted actual response for the printer for each addressable print location in the spatial range. The “predicted” and “average” tone response curves are obtained using the 2×2 binary printer model.

Abstract translation: 每个颜色通道和半色调的预测色调响应曲线使用二进制打印机模型预测并存储，其中“预测色调响应曲线”为空间范围内的每个可寻址像素位置提供基于打印机的实际响应的基于模型的近似 。 还通过在打印机的空间范围上对“预测色调响应曲线”进行平均，还存储“平均预测色调响应”。 利用“真实平均”音调响应曲线，“预测音响响应曲线”和“平均预测音响响应曲线”，可以数学地获得颜色通道的真实色调响应曲线的估计，其中真正的音调 响应曲线定义了空间范围内每个可寻址打印位置的打印机预测的实际响应。 使用2×2二进制打印机模型获得“预测”和“平均”音调响应曲线。

公开(公告)号：US20100238508A1

公开(公告)日：2010-09-23

申请号：US12405737

申请日：2009-03-17

Applicant: Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

Inventor： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC: H04N1/405

CPC classification number: H04N1/6033

Abstract: A method and system is disclosed for characterizing a color scanner comprising generating a halftone-independent target of color patches, printing the target on a color hardcopy device, measuring the target to obtain device-independent color values, scanning the target to obtain scanner color values, and building a scanner profile that relates scanned color values to device-independent color values.

Abstract translation: 公开了一种用于表征彩色扫描仪的方法和系统，该彩色扫描仪包括产生色调不依赖于色块的目标，在彩色硬拷贝装置上打印目标，测量目标以获得与装置无关的色彩值，扫描目标以获得扫描仪颜色值 ，并构建扫描仪配置文件，将扫描的颜色值与设备无关的颜色值相关联。

公开(公告)号：US20100182649A1

公开(公告)日：2010-07-22

申请号：US12356897

申请日：2009-01-21

Applicant: Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

Inventor： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC: H04N1/405

CPC classification number: H04N1/6033 ,  H04N1/4078

Abstract: A model-based halftone independent method for characterizing a printer equipped with a plural of halftone screens comprises: printing a target set of basic patches comprised of a fundamental binary pattern independent of a halftone screen; measuring true color printer response from the target set; modeling a halftone independent characterization of the printer with the mathematical transformation using the measured response; modeling a first halftone dependent characterization of the printer with the mathematical transformer to generate a first predicted result using a selected halftone screen; comparing a measured response of the printer using the halftone screen with the predicted result to define a correction factor corresponding to the halftone screen; and modeling a halftone dependent characterization of the printer using a predicted response of the fundamental binary pattern and the correction factor.

Abstract translation: 用于表征配备有多个半色调网版的打印机的基于模型的半色调独立方法包括：打印由基本二进制图案独立于半色调屏幕组成的基本色块的目标集合; 测量来自目标组的真彩打印机响应; 使用测量响应的数学变换建模打印机的半色调独立表征; 使用数学变压器对打印机的第一半色调依赖特征进行建模，以使用所选择的半色调屏幕产生第一预测结果; 将使用半色调屏幕的打印机的测量响应与预测结果进行比较，以定义对应于半色调屏幕的校正因子; 以及使用基本二进制模式和校正因子的预测响应对打印机的半色调依赖特征进行建模。

公开(公告)号：US20070177231A1

公开(公告)日：2007-08-02

申请号：US11343656

申请日：2006-01-31

Applicant: Shen-ge Wang ,  Raja Bala ,  Vishal Monga

Inventor： Shen-ge Wang ,  Raja Bala ,  Vishal Monga

IPC: H04N1/46

CPC classification number: H04N1/4078 ,  H04N1/40006

Abstract: A method for compensating for color drift in a printer includes determining a first true tone response curve for a color channel when said printer is in a first state. A first estimated tone response curve for the color channel is also determined when said printer is in the first state. A second estimated tone response curve for the color channel is determined when the printer is in a second, color-drifted state relative to the first state. A second true tone response curve for the color channel is mathematically predicted using the first true tone response curve, the first estimated tone response curve, and the second estimated tone response curve. The first and second estimated tone response curves are estimated using a 2×2 printer model. A printing apparatus includes an image processing unit for implementing the color-drift correction process.

Abstract translation: 用于补偿打印机中的颜色漂移的方法包括当所述打印机处于第一状态时，确定用于颜色通道的第一真实色调响应曲线。 当所述打印机处于第一状态时，还确定色彩通道的第一估计色调响应曲线。 当打印机处于相对于第一状态的第二颜色漂移状态时，确定用于颜色通道的第二估计色调响应曲线。 使用第一真实色调响应曲线，第一估计色调响应曲线和第二估计色调响应曲线来数学地预测用于色彩通道的第二真正色调响应曲线。 使用2x2打印机模型来估计第一和第二估计音响应曲线。 打印装置包括用于实现色差校正处理的图像处理单元。

公开(公告)号：US20120133991A1

公开(公告)日：2012-05-31

申请号：US13300845

申请日：2011-11-21

Applicant: Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

Inventor： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC: H04N1/405

CPC classification number: G06K15/02 ,  G06K15/027 ,  H04N1/52 ,  H04N1/6027 ,  H04N1/6033

Abstract: A method and apparatus are provided for compensating for spatial non-uniformities in a printer by deriving a true spatial non-uniformity tone response curve (TRC) that characterizes the printer in terms of color output variation for each addressable pixel location in a spatial range. The “true average” tone response curve is determined for a color channel. A prediction of the true response as a function of the spatial location is derived by printing and scanning a specially designed halftone-independent target of binary patterns. The predicted tone response curve for each color channel and halftone is predicted using a binary printer model, wherein the “predicted tone response curve” provides a model based approximation of the actual response for each addressable pixel location in the spatial range. Also stored is an “average predicted tone response” by averaging the “predicted tone response curve” over the spatial range of the printer.

Abstract translation: 提供了一种方法和装置，用于通过根据空间范围内的每个可寻址像素位置的颜色输出变化导出表征打印机的真实空间不均匀色调响应曲线（TRC）来补偿打印机中的空间非均匀性。 针对颜色通道确定“真实平均”色调响应曲线。 作为空间位置的函数的真实响应的预测是通过打印和扫描专门设计的与二元模式无关的目标的二进制模式得出的。 使用二进制打印机模型预测每个颜色通道和半色调的预测色调响应曲线，其中“预测色调响应曲线”为空间范围内的每个可寻址像素位置提供基于模型的近似实际响应。 还通过在打印机的空间范围上对“预测色调响应曲线”进行平均，还存储“平均预测色调响应”。

公开(公告)号：US20120081755A1

公开(公告)日：2012-04-05

申请号：US12894475

申请日：2010-09-30

Applicant: Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

Inventor： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC: H04N1/405

CPC classification number: H04N1/6033

Abstract: Systems and methods are described that facilitate reducing a number of patches used in characterizing a color halftone printer via a binary color printer model. A binary printer model involves printing of a fundamental set of color binary patterns that encompass all possible halftone outputs. A k-center clustering technique is employed to automatically find and eliminate redundancies in the initial set of binary color patterns. Once the number of patches is reduced to an acceptable number, a multiplicative reflectance model is applied that better approximates the physical process and therefore improves accuracy.

Abstract translation: 描述了有助于通过二进制彩色打印机模型减少用于表征彩色半色调打印机的多个补丁的系统和方法。 二进制打印机模型涉及打印包含所有可能的半色调输出的基本颜色二进制图案集。 采用k-中心聚类技术来自动寻找和消除初始二值颜色图案集中的冗余。 一旦将补片的数量减少到可接受的数量，则应用更好地逼近物理过程并因此提高准确度的乘法反射率模型。

公开(公告)号：US20100182616A1

公开(公告)日：2010-07-22

申请号：US12355450

申请日：2009-01-16

Applicant: Vishal Monga ,  Shen-ge Wang

Inventor： Vishal Monga ,  Shen-ge Wang

IPC: H04N1/405

CPC classification number: H04N1/4078 ,  H04N1/40006

Abstract: Disclosed are systems and methods for halftone independent temporal color drift correction, particularly for correction in hi-addressability xerographic printers

Abstract translation: 公开了用于半色调独立的时间色彩漂移校正的系统和方法，特别是用于在高可寻址性静电印刷机中的校正

公开(公告)号：US07724406B2

公开(公告)日：2010-05-25

申请号：US11343656

申请日：2006-01-31

Applicant: Shen-ge Wang ,  Raja Bala ,  Vishal Monga

Inventor： Shen-ge Wang ,  Raja Bala ,  Vishal Monga

IPC: H04N1/60

CPC classification number: H04N1/4078 ,  H04N1/40006

Abstract: A method for compensating for color drift in a printer includes determining a first true tone response curve for a color channel when said printer is in a first state. A first estimated tone response curve for the color channel is also determined when said printer is in the first state. A second estimated tone response curve for the color channel is determined when the printer is in a second, color-drifted state relative to the first state. A second true tone response curve for the color channel is mathematically predicted using the first true tone response curve, the first estimated tone response curve, and the second estimated tone response curve. The first and second estimated tone response curves are estimated using a 2×2 printer model. A printing apparatus includes an image processing unit for implementing the color-drift correction process.

Abstract translation: 用于补偿打印机中的颜色漂移的方法包括当所述打印机处于第一状态时，确定用于颜色通道的第一真实色调响应曲线。 当所述打印机处于第一状态时，还确定色彩通道的第一估计色调响应曲线。 当打印机处于相对于第一状态的第二颜色漂移状态时，确定用于颜色通道的第二估计色调响应曲线。 使用第一真实色调响应曲线，第一估计色调响应曲线和第二估计色调响应曲线来数学地预测用于色彩通道的第二真正色调响应曲线。 使用2×2打印机模型估计第一和第二估计音响响应曲线。 打印装置包括用于实现色差校正处理的图像处理单元。