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1. 发明申请

WO2013103559A1 HALFTONE SCREEN GENERATION MECHANISM 审中-公开
标题翻译： HALFTONE屏幕生成机制
公开(公告)号：WO2013103559A1
公开(公告)日：2013-07-11
申请号：PCT/US2012/071516
申请日：2012-12-21
申请人： RICOH PRODUCTION PRINT SOLUTIONS LLC
发明人： CHANDU, Kartheek , STANICH, Mikel , WU, Chai Wah , TRAGER, Barry M.
IPC分类号： H04N1/40
CPC分类号： H04N1/4051 , H04N1/40087
摘要： A method is disclosed. The method includes generating a Continuous Tone Image (CTI) with all pixel values same as the first gray level and an initial Half Tone Image (HTI) with all pixel values equal to minimum absorptance level, computing a change in pixel error by toggling with all the possible output states and swapping with all neighbor pixels only if the stacking constraint is satisfied, updating the HTI with the maximum error decrease operation and continue to next pixel location till the end criteria is met. Once the end criteria is met, the updated HTI is saved as a final halftone screen for that gray level and copied as the initial HTI for the next gray level along with CTI pixel values updated to the next gray level till the final gray value is reached.
摘要翻译：公开了一种方法。该方法包括产生具有与第一灰度级相同的所有像素值的连续色调图像（CTI）和具有等于最小吸收水平的所有像素值的初始半色调图像（HTI），通过全部切换来计算像素误差的变化可能的输出状态和所有相邻像素的交换只有在满足堆叠约束的情况下，用最大误差减少操作更新HTI并继续到下一个像素位置，直到满足结束标准。一旦满足结束标准，更新的HTI被保存为该灰度级的最终半色调屏幕，并被复制为用于下一个灰度级的初始HTI，以及更新到下一个灰度级的CTI像素值，直到达到最终灰度值。

2. 发明申请

WO2012027100A1 PRINTER CALIBRATION FOR PRINTERS WITH FIXED PRINT ARRAY STRUCTURES 审中-公开
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：WO2012027100A1
公开(公告)日：2012-03-01
申请号：PCT/US2011/047091
申请日：2011-08-09
申请人： RICOH PRODUCTION PRINT SOLUTIONS LLC , CHANDU, Kartheek , ERNST, Larry M. , VANTARAM, Sreenath R. , STANICH, Mikel J.
发明人： CHANDU, Kartheek , ERNST, Larry M. , VANTARAM, Sreenath R. , STANICH, Mikel J.
IPC分类号： H04N1/401 , 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。

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