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1. 发明授权

US08282182B2 Correction of print engine artifacts using an iterative halftoning search algorithm 有权
标题翻译：使用迭代半色调搜索算法校正打印引擎伪影
公开(公告)号：US08282182B2
公开(公告)日：2012-10-09
申请号：US12546445
申请日：2009-08-24
申请人： Kartheek Chandu , Larry M. Ernst , Nenad Rijavec , Mikel J. Stanich , Sreenath R. Vantaram , Chai W. Wu
发明人： Kartheek Chandu , Larry M. Ernst , Nenad Rijavec , Mikel J. Stanich , Sreenath R. Vantaram , Chai W. Wu
IPC分类号： B41J2/205 , G06K15/00
CPC分类号： H04N1/40075 , H04N1/4015 , H04N1/4051
摘要： Methods and systems herein provide for reducing artifacts during printing. One printing system is operable to prepare a continuous tone image (CTI) for printing onto a print medium by generating an initial half tone image (HTI) based on the CTI. The printing system includes a printer and a print controller. The print controller filters the initial HTI and the CTI with a perceptual filter and determines an error between the filtered CTI and the filtered HTI. The print controller prints the HTI via the printer to determine printer artifacts and processes a scanned version of the printed HTI to determine an error between the filtered CTI and the scanned and filtered HTI. This processing updates the initial HTI and reduces the error between the filtered CTI and the filtered HTI.
摘要翻译：本文的方法和系统提供了在打印期间减少伪影。一个打印系统可操作以通过基于CTI生成初始半色调图像（HTI）来准备用于打印到打印介质上的连续色调图像（CTI）。打印系统包括打印机和打印控制器。打印控制器用感知过滤器对初始HTI和CTI进行过滤，并确定过滤后的CTI和经过过滤的HTI之间的错误。打印控制器通过打印机打印HTI以确定打印机工件并处理打印的HTI的扫描版本，以确定过滤后的CTI与扫描和过滤的HTI之间的错误。该处理更新初始HTI并减少过滤后的CTI与经过滤的HTI之间的误差。

2. 发明申请

US20120050755A1 PRINTER CALIBRATION FOR PRINTERS WITH FIXED PRINT ARRAY STRUCTURES 有权
标题翻译：具有固定打印阵列结构的打印机的打印机校准
公开(公告)号：US20120050755A1
公开(公告)日：2012-03-01
申请号：US12868311
申请日：2010-08-25
申请人： Kartheek Chandu , Larry M. Ernst , Sreenath R. Vantaram , Mikel J. Stanich
发明人： Kartheek Chandu , Larry M. Ernst , Sreenath R. Vantaram , Mikel J. Stanich
IPC分类号： H04N1/60
CPC分类号： H04N1/6033
摘要： The systems and methods presented herein provide for calibrating a print engine of a printing system. The printing system prints image data on a print medium and scans the printed image data. Color values of the scanned image data are then measured and various tints of color values and their transition locations are identified. A calibration module estimates the original optical densities of the identified color value tints and generates a target optical density for each of the identified color value tints using the estimated original optical densities to determine print irregularities in the color values of the scanned image data. The calibration module then generates a halftone screen based on the mean optical densities and applies the generated halftone screen to the print engine to calibrate the print engine.
摘要翻译：本文提出的系统和方法用于校准打印系统的打印引擎。打印系统在打印介质上打印图像数据并扫描打印的图像数据。然后测量扫描图像数据的颜色值，并且识别颜色值及其转变位置的各种色调。校准模块估计所识别的颜色值色调的原始光密度，并且使用估计的原始光密度来生成每个识别色值色调的目标光密度，以确定扫描图像数据的颜色值中的印刷不规则性。校准模块然后基于平均光密度生成半色调屏幕，并将生成的半色调屏幕应用于打印引擎以校准打印引擎。

3. 发明授权

US08820880B2 Defective nozzle detection mechanism 有权
标题翻译：喷嘴检测机构不良
公开(公告)号：US08820880B2
公开(公告)日：2014-09-02
申请号：US13439430
申请日：2012-04-04
申请人： Kartheek Chandu , Larry M. Ernst , Mikel J. Stanich , Sreenath Rao Vantaram
发明人： Kartheek Chandu , Larry M. Ernst , Mikel J. Stanich , Sreenath Rao Vantaram
IPC分类号： B41J29/393
CPC分类号： B41J2/2142
摘要： A method is disclosed. The method includes receiving image data from one or more image readers and analyzing the image data to locate and classify artifacts on the medium caused by defective print engine nozzles.
摘要翻译：公开了一种方法。该方法包括从一个或多个图像读取器接收图像数据并分析图像数据以定位和分类由缺陷打印引擎喷嘴引起的介质上的伪影。

4. 发明授权

US08807691B2 Print head alignment mechanism 有权
标题翻译：打印头对准机构
公开(公告)号：US08807691B2
公开(公告)日：2014-08-19
申请号：US13438555
申请日：2012-04-03
申请人： Kartheek Chandu , Mikel J. Stanich , Larry M. Ernst , Sreenath Rao Vantaram , Chai Wah Wu
发明人： Kartheek Chandu , Mikel J. Stanich , Larry M. Ernst , Sreenath Rao Vantaram , Chai Wah Wu
IPC分类号： B41J29/38 , B41J29/393
CPC分类号： B41J2/2135
摘要： A printing system is disclosed. The printing system includes a print engine including two or more print heads to generate an alignment chart and an alignment system. The alignment system receives the alignment chart and computes a magnitude of misalignment between the print heads.
摘要翻译：公开了一种打印系统。打印系统包括包括两个或多个打印头的打印引擎以产生对准图和对准系统。对准系统接收对准图并计算打印头之间的未对准的大小。

5. 发明申请

US20130257969A1 Print Head Alignment Mechanism 有权
标题翻译：打印头校准机制
公开(公告)号：US20130257969A1
公开(公告)日：2013-10-03
申请号：US13438555
申请日：2012-04-03
申请人： Kartheek Chandu , Mikel J. Stanich , Larry M. Ernst , Sreenath Rao Vantaram , Chai Wah Wu
发明人： Kartheek Chandu , Mikel J. Stanich , Larry M. Ernst , Sreenath Rao Vantaram , Chai Wah Wu
IPC分类号： B41J29/393
CPC分类号： B41J2/2135
摘要： A printing system is disclosed. The printing system includes a print engine including two or more print heads to generate an alignment chart and an alignment system. The alignment system receives the alignment chart and computes a magnitude of misalignment between the print heads.
摘要翻译：公开了一种打印系统。打印系统包括包括两个或多个打印头的打印引擎以产生对准图和对准系统。对准系统接收对准图并计算打印头之间的未对准的大小。

6. 发明申请

US20100045722A1 CORRECTION OF PRINT ENGINE ARTIFACTS USING AN ITERATIVE HALFTONING SEARCH ALGORITHM 有权
标题翻译：使用迭代搜索算法对打印引擎文件进行校正
公开(公告)号：US20100045722A1
公开(公告)日：2010-02-25
申请号：US12546445
申请日：2009-08-24
申请人： Kartheek Chandu , Larry M. Ernst , Nenad Rijavec , Mikel J. Stanich , Sreenath R. Vantaram , Chai W. Wu
发明人： Kartheek Chandu , Larry M. Ernst , Nenad Rijavec , Mikel J. Stanich , Sreenath R. Vantaram , Chai W. Wu
IPC分类号： B41J2/205
CPC分类号： H04N1/40075 , H04N1/4015 , H04N1/4051
摘要： Methods and systems herein provide for reducing artifacts during printing. One printing system is operable to prepare a continuous tone image (CTI) for printing onto a print medium by generating an initial half tone image (HTI) based on the CTI. The printing system includes a printer and a print controller. The print controller filters the initial HTI and the CTI with a perceptual filter and determines an error between the filtered CTI and the filtered HTI. The print controller prints the HTI via the printer to determine printer artifacts and processes a scanned version of the printed HTI to determine an error between the filtered CTI and the scanned and filtered HTI. This processing updates the initial HTI and reduces the error between the filtered CTI and the filtered HTI.
摘要翻译：本文的方法和系统提供了在打印期间减少伪影。一个打印系统可操作以通过基于CTI生成初始半色调图像（HTI）来准备用于打印到打印介质上的连续色调图像（CTI）。打印系统包括打印机和打印控制器。打印控制器用感知过滤器对初始HTI和CTI进行过滤，并确定过滤后的CTI和经过过滤的HTI之间的错误。打印控制器通过打印机打印HTI以确定打印机工件并处理打印的HTI的扫描版本，以确定过滤后的CTI与扫描和过滤的HTI之间的错误。该处理更新初始HTI并减少过滤后的CTI与经过滤的HTI之间的误差。

7. 发明授权

US08542418B2 Printer calibration for printers with fixed print array structures 有权
标题翻译：具有固定打印阵列结构的打印机的打印机校准
公开(公告)号：US08542418B2
公开(公告)日：2013-09-24
申请号：US12868311
申请日：2010-08-25
申请人： Kartheek Chandu , Larry M. Ernst , Sreenath R. Vantaram , Mikel J. Stanich
发明人： Kartheek Chandu , Larry M. Ernst , Sreenath R. Vantaram , Mikel J. Stanich
IPC分类号： H04N1/46
CPC分类号： H04N1/6033
摘要： The systems and methods presented herein provide for calibrating a print engine of a printing system. The printing system prints image data on a print medium and scans the printed image data. Color values of the scanned image data are then measured and various tints of color values and their transition locations are identified. A calibration module estimates the original optical densities of the identified color value tints and generates a target optical density for each of the identified color value tints using the estimated original optical densities to determine print irregularities in the color values of the scanned image data. The calibration module then generates a halftone screen based on the mean optical densities and applies the generated halftone screen to the print engine to calibrate the print engine.
摘要翻译：本文提出的系统和方法用于校准打印系统的打印引擎。打印系统在打印介质上打印图像数据并扫描打印的图像数据。然后测量扫描图像数据的颜色值，并且识别颜色值及其转变位置的各种色调。校准模块估计所识别的颜色值色调的原始光密度，并且使用估计的原始光密度来生成每个识别色值色调的目标光密度，以确定扫描图像数据的颜色值中的印刷不规则性。校准模块然后基于平均光密度生成半色调屏幕，并将生成的半色调屏幕应用于打印引擎以校准打印引擎。

8. 发明授权

US08322811B2 Multi-pass calibration in fixed printhead array printers 有权
标题翻译：固定打印头阵列打印机的多通道校准
公开(公告)号：US08322811B2
公开(公告)日：2012-12-04
申请号：US12640692
申请日：2009-12-17
申请人： Kartheek Chandu , Mikel J. Stanich , Larry M. Ernst
发明人： Kartheek Chandu , Mikel J. Stanich , Larry M. Ernst
IPC分类号： B41J2/205
CPC分类号： B41J2/2052 , B41J2/2146 , H04N1/4078
摘要： Methods and apparatus herein provide for automated calibration of multiple printheads used in a multi-pass printing system. Aspects hereof print a plurality of gray scale printed patterns each printed pattern corresponding to a gray scale value for each of the multiple printheads. The printed patterns are then measured to determine the intensity (e.g., optical density) of each of the printed patterns. A measurement function is derived from the measured intensity and gray scale levels used to print each pattern. Calibrated transfer functions are then determined from the measurement function and target function where each calibrated transfer function relates, for a corresponding printhead, an input gray scale level of a pixel in an image to be printed to a calibrated gray scale level to use for the corresponding printhead when operating in multi-pass mode.
摘要翻译：本文的方法和装置提供了用于多遍打印系统中的多个打印头的自动校准。本发明的方面打印多个灰度印刷图案，每个印刷图案对应于多个打印头中的每一个的灰度值。然后测量印刷图案以确定每个印刷图案的强度（例如，光密度）。从用于打印每个图案的测量强度和灰度级别导出测量功能。然后，校准的传递函数从每个校准传递函数所涉及的测量功能和目标函数确定，对于相应的打印头，将要打印的图像中的像素的输入灰度级别用于校准的灰度级以用于相应的打印头在多通道模式下运行。

9. 发明申请

US20130265360A1 Defective Nozzle Detection Mechanism 有权
标题翻译：喷嘴检测机构不良
公开(公告)号：US20130265360A1
公开(公告)日：2013-10-10
申请号：US13439430
申请日：2012-04-04
申请人： Kartheek Chandu , Larry M. Ernst , Mikel J. Stanich , Sreenath Rao Vantaram
发明人： Kartheek Chandu , Larry M. Ernst , Mikel J. Stanich , Sreenath Rao Vantaram
IPC分类号： B41J29/393
CPC分类号： B41J2/2142
摘要： A method is disclosed. The method includes receiving image data from one or more image readers and analyzing the image data to locate and classify artifacts on the medium caused by defective print engine nozzles.
摘要翻译：公开了一种方法。该方法包括从一个或多个图像读取器接收图像数据并分析图像数据以定位和分类由缺陷打印引擎喷嘴引起的介质上的伪影。

10. 发明申请

US20110148968A1 MULTI-PASS CALIBRATION IN FIXED PRINTHEAD ARRAY PRINTERS 有权
标题翻译：固定打印机阵列打印机中的多通道校准
公开(公告)号：US20110148968A1
公开(公告)日：2011-06-23
申请号：US12640692
申请日：2009-12-17
申请人： Kartheek Chandu , Mikel J. Stanich , Larry M. Ernst
发明人： Kartheek Chandu , Mikel J. Stanich , Larry M. Ernst
IPC分类号： B41J2/205
CPC分类号： B41J2/2052 , B41J2/2146 , H04N1/4078
摘要： Methods and apparatus herein provide for automated calibration of multiple printheads used in a multi-pass printing system. Aspects hereof print a plurality of gray scale printed patterns each printed pattern corresponding to a gray scale value for each of the multiple printheads. The printed patterns are then measured to determine the intensity (e.g., optical density) of each of the printed patterns. A measurement function is derived from the measured intensity and gray scale levels used to print each pattern. Calibrated transfer functions are then determined from the measurement function and target function where each calibrated transfer function relates, for a corresponding printhead, an input gray scale level of a pixel in an image to be printed to a calibrated gray scale level to use for the corresponding printhead when operating in multi-pass mode.
摘要翻译：本文的方法和装置提供了用于多遍打印系统中的多个打印头的自动校准。本发明的方面打印多个灰度印刷图案，每个印刷图案对应于多个打印头中的每一个的灰度值。然后测量印刷图案以确定每个印刷图案的强度（例如，光密度）。从用于打印每个图案的测量强度和灰度级别导出测量功能。然后，校准的传递函数从每个校准传递函数所关联的测量功能和目标函数确定，对于相应的打印头，将要打印的图像中的像素的输入灰度级别用于校准的灰度级以用于相应的打印头在多通道模式下运行。

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