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    • 3. 发明申请
    • Interactive visual card-selection process for mitigating light-area banding in a pagewide array
    • 交互式视觉卡选择过程,用于减轻页面范围阵列中的光区域条带
    • US20090028585A1
    • 2009-01-29
    • US11881553
    • 2007-07-27
    • Shilin GuoGuo LiRob Patrick ChohanJulie Huynh
    • Shilin GuoGuo LiRob Patrick ChohanJulie Huynh
    • G03G13/00
    • B41J2/155B41J2/2132B41J2202/20
    • Preferably, test-patterns print on separate, multiple print-medium cards, each including a ramp with colors graded along a certain direction—and, superimposed on the ramp, a candidate add-on colorant. Ramps preferably are printed in so-called “customer colors”, common in snapshots and particularly snapshot regions that include sky. Positions or amounts of the candidate add-on colorant canvass a likely range of values that optimize camouflaging or suppression of a banding artifact (due to seams in the pagewide array) that is extended along the same certain direction. For each seam and each “customer color” used, an operator holds up several cards for comparison, selecting the best one to three. Operators thus can evaluate candidate colorant patterns in context of many different tones of the sky and other customer colors. Preferably banding suppression is integrated with linearization: at each seam a series of linearization tables is smoothly interpolated between measurement-based tables for adjacent inkjet dice.
    • 优选地,测试图案打印在单独的多个打印介质卡上,每个包括沿着特定方向分级的颜色的斜面,并且叠加在斜面上,候选的附加着色剂。 斜坡优选地以所谓的“客户颜色”打印,在快照中特别是包括天空的快照区域中。 候选者附加色素的位置或数量可以绘制一些可能的范围的值,该值可以优化伪装或抑制条纹伪影(由于页面范围阵列中的接缝)而沿同一特定方向延伸。 对于每个接缝和每个“客户颜色”使用,操作员拿起几张卡进行比较,选择最好的一到三个。 因此,操作者可以在天空和其他客户颜色的许多不同色调的背景下评估候选着色剂图案。 优选地,带状抑制与线性化集成:在每个接缝处,在相邻喷墨骰子的基于测量的表之间平滑地插入一系列线性化表。
    • 7. 发明授权
    • Device state error diffusion technique for halftoning
    • 用于半色调的器件状态误差扩散技术
    • US06081344A
    • 2000-06-27
    • US960779
    • 1997-10-30
    • Francis E. BockmanGuo Li
    • Francis E. BockmanGuo Li
    • H04N1/52G06F15/00
    • H04N1/52
    • A halftoning technique is disclosed which uses look-up tables to identify a combination of color ink drops (device states) to be printed by an inkjet printer. The look-up tables are indexed by a particular color to be reproduced. An error is also output by the look-up tables reflecting the difference between the indexing tone level and the printed color spot. The error is applied in a halftoning process to neighboring pixels. A plurality of look-up tables is used, and one of the look-up tables is selected for a particular medium (e.g., glossy paper, plain paper) to be printed upon. In this manner, the number and combination of ink drops can be optimize for a particular type of medium. In one embodiment, six different color inks are used by the printer.
    • 公开了一种半色调技术,其使用查找表来识别由喷墨打印机打印的彩色墨滴(装置状态)的组合。 查找表由要重现的特定颜色索引。 查询表也会输出错误,反映了索引音级与打印色点之间的差异。 该错误在半色调处理中应用于相邻像素。 使用多个查找表,并且为要打印的特定介质(例如光面纸,普通纸)选择一个查找表。 以这种方式,可以针对特定类型的介质优化墨滴的数量和组合。 在一个实施例中,打印机使用六种不同颜色的油墨。