公开(公告)号：US06643032B1

公开(公告)日：2003-11-04

申请号：US09221239

申请日：1998-12-28

申请人： Peter A. Crean ,  Martin S. Maltz

发明人： Peter A. Crean ,  Martin S. Maltz

IPC分类号： H04N1405

CPC分类号： H04N1/4078 ,  H04N1/4055

摘要： A halftone cell is composed of a plurality of pixel groupings predefined to correspond to optimal tone level gradations. Selected output pixel groupings vary in number, and in shape of subpixels used from other pixel groupings, in order that successive input levels correspond to successive halftone cells defining substantially equal changes in a measured darkness value. Tone level gradations are optimized by purposeful correlation of input levels to output levels, especially where the number of output levels exceeds the number of input levels. During optimization, a calibration sample is produced by the image output device and calibration elements are empirically measured. Darkness change between successive levels is calculated and compared. Where the percentage of darkness change exceeds a desired amount, additional calibration elements are produced until the change calculated between successive levels is substantially the same. Successive input levels are associated with successive output levels such that a change between any adjacent input levels produces a change in darkness in the desired amount. The correlation is stored in a look up table for use during operation of the image output device.

摘要翻译： 半色调单元由预定为对应于最佳色阶等级的多个像素分组组成。 所选择的输出像素分组在其他像素分组中使用的子像素的数量和形状不同，以便连续的输入电平对应于连续的半色调单元，其在测量的黑暗值中定义基本相等的变化。 通过输入电平与输出电平的有意义的相关性来优化音调级别，特别是输出电平数量超过输入电平数量时。 在优化期间，由图像输出装置产生校准样品，并且经验地测量校准元件。 计算并比较连续水平之间的黑暗变化。 在黑暗变化百分比超过所需量的情况下，产生额外的校准元件，直到在连续水平之间计算的变化基本相同。 连续输入电平与连续输出电平相关联，使得任何相邻输入电平之间的变化产生期望量的黑暗变化。 相关性存储在查找表中，以在图像输出设备的操作期间使用。

公开(公告)号：US07307752B1

公开(公告)日：2007-12-11

申请号：US09566291

申请日：2000-05-05

申请人： Lingappa K. Mestha ,  Peter A. Crean ,  Martin S. Maltz ,  Robert J. Rolleston ,  Yao Rong Wang ,  Eric Jackson ,  Thyagarajan Balasubramanian

发明人： Lingappa K. Mestha ,  Peter A. Crean ,  Martin S. Maltz ,  Robert J. Rolleston ,  Yao Rong Wang ,  Eric Jackson ,  Thyagarajan Balasubramanian

IPC分类号： G06F15/00 ,  H04N1/46 ,  G03F3/08

CPC分类号： G06F15/00 ,  H04N1/4078 ,  H04N1/6027 ,  H04N1/6033

摘要： A color marking device including a control system for calibration of the device based upon dynamic color balance control of an output image. The system comprises a front end converter for converting an input signal representative of a target image comprising a preselected color into a device-dependent control signal in accordance with a device TRC, a color marking device for outputting an output image in response to the control signal, a sensor for measuring a parameter from the output image representative of a color of the output image, and, a point-wise controller for comparing the parameter with a corresponding parameter from the target image and constructing adjusted controlled points for the device TRC when the measured parameter and the corresponding parameter vary by a preselected value, a color balance controller for constructing an adjusted device TRC from the controlled points, whereby subsequently generated output images are output with the adjusted device TRC and, more accurately represent target input images.

摘要翻译： 一种彩色标记装置，包括基于输出图像的动态色彩平衡控制来校准装置的控制系统。 该系统包括：前端转换器，用于根据设备TRC将表示包括预选颜色的目标图像的输入信号转换成依赖于设备的控制信号;响应于控制信号输出输出图像的颜色标记装置 ，用于从表示输出图像的颜色的输出图像中测量参数的传感器，以及用于将参数与来自目标图像的相应参数进行比较的逐点控制器，并且当所述设备TRC的调整的控制点在 测量参数和相应的参数由预选值变化，用于从受控点构建调整的设备TRC的色平衡控制器，由此随后生成的输出图像被调整的设备TRC输出，并且更精确地表示目标输入图像。

公开(公告)号：US07277196B2

公开(公告)日：2007-10-02

申请号：US10342873

申请日：2003-01-15

申请人： Jean-Pierre R. M. Van de Capelle ,  Lalit K. Mestha ,  Robert P. Loce ,  Raja Bala ,  Martin S. Maltz ,  Peter A. Crean

发明人： Jean-Pierre R. M. Van de Capelle ,  Lalit K. Mestha ,  Robert P. Loce ,  Raja Bala ,  Martin S. Maltz ,  Peter A. Crean

IPC分类号： G06F15/00

CPC分类号： H04N1/4078 ,  H04N1/6033

摘要： A system and method for printer control and color balance calibration. The system and method address the image quality problems of print engine instability, low quality of color balance and contouring from the calibration. The method includes defining combinations of colorants, such as inks or toners that will be used to print images, defining a desired response for the combinations that are to be used and, in real time, iteratively printing CMY halftone color patches, measuring the printed patches via an in situ sensor and iteratively performing color-balance calibration based on the measurements, accumulating corrections until the measurements are within a predetermined proximity of the desired response. The calibration is performed on the halftones while they are in a high quantization resolution form.

摘要翻译： 一种用于打印机控制和色平衡校准的系统和方法。 该系统和方法解决了打印引擎不稳定的图像质量问题，色彩平衡质量差和校准轮廓。 该方法包括定义着色剂的组合，例如将用于打印图像的油墨或调色剂，为要使用的组合定义期望的响应，并且实时迭代地打印CMY半色调色块，测量印刷的贴片 通过原位传感器并且基于测量迭代地执行色平衡校准，累积校正直到测量值在所需响应的预定接近度内。 校准在半色调上进行，而它们处于高量化分辨率形式。

公开(公告)号：US08547613B2

公开(公告)日：2013-10-01

申请号：US12915217

申请日：2010-10-29

申请人： Lalit Keshav Mestha ,  Martin S. Maltz ,  Yao Rong Wang

发明人： Lalit Keshav Mestha ,  Martin S. Maltz ,  Yao Rong Wang

IPC分类号： H04N1/60 ,  G03F3/08 ,  G06K9/00

CPC分类号： H04N1/6022

摘要： What is disclosed is a novel system and method of inheriting intended GCR into a 4-to-4 cascaded LUT to compensate for print engine change which adversely impacts the quality of an output print. The present method uses the device link transform to generate starting LUT nodes for the inverse of the drifted printer model by inputting CMYK or RGB into the device link at a color space resolution sufficient to determine output nodes. Lab and CMYK values are derived from this process, and a “starting LUT” is created at the Lab destination nodes. An iterative control begins with this starting LUT to produce an inverse drifted printer model that contains a close approximation for the intended GCR. The present method captures the intent of the device link transform for a fleet and generates the cascaded LUT for drift, specific printer, side1/side2, and other modes leading to special GCRs.

摘要翻译： 所公开的是将期望的GCR继承到4对4级联LUT中以补偿不利地影响输出打印质量的打印引擎改变的新型系统和方法。 本方法使用设备链接变换通过以足以确定输出节点的颜色空间分辨率将CMYK或RGB输入到设备链接中来生成漂移的打印机模型的倒数的起始LUT节点。 实验室和CMYK值是从该过程得到的，并且在实验室目标节点处创建一个“起始LUT”。 迭代控制开始于该起始LUT以产生包含对于预期GCR的近似近似的反漂移打印机模型。 本方法捕获了针对车队的设备链接变换的意图，并生成用于漂移，特定打印机，side1 / side2和导致特殊GCR的其他模式的级联LUT。

公开(公告)号：US08526727B2

公开(公告)日：2013-09-03

申请号：US12815823

申请日：2010-06-15

申请人： Martin S. Maltz ,  Raja Bala ,  Lalit Keshav Mestha

发明人： Martin S. Maltz ,  Raja Bala ,  Lalit Keshav Mestha

IPC分类号： G06K9/00 ,  G06K9/36 ,  G06K1/00 ,  G06F15/00 ,  H04N1/60 ,  G03F3/08 ,  G09G5/02

CPC分类号： G06K9/00 ,  G06T11/001

摘要： A system and method for generating a hierarchical LUT for implementing a color transformation within a color imaging system. In one embodiment, a coarse LUT is received which comprises a plurality of sub-cubes arrayed on a plurality of coarse levels on a structured coarse grid. Each of the sub-cubes encompasses at least one coarse LUT node. Sub-cubes in the coarse grid are identified that are bisected by a boundary surface of the gamut. Then, each of the identified coarse LUT sub-cubes are associated with fine LUT which comprises a plurality of fine LUT nodes arrayed on a plurality of fine levels on a structured fine grid. A hierarchical LUT is generated from the coarse LUT and the associated fine LUTs. Thereafter, the hierarchical LUT can be used for color transformation within a color imaging system.

摘要翻译： 一种用于生成用于在彩色成像系统内实现颜色变换的分层LUT的系统和方法。 在一个实施例中，接收粗略LUT，其包括排列在结构化粗网格上的多个粗略级上的多个子立方体。 每个子立方体包含至少一个粗略LUT节点。 识别粗网格中的子立方体，其被色域的边界面平分。 然后，识别的粗略LUT子立方体中的每一个都与精细LUT相关联，该精细LUT包括排列在结构化细网格上的多个精细级上的多个精细LUT节点。 从粗略LUT和相关联的精细LUT生成分层LUT。 此后，分层LUT可以用于彩色成像系统内的颜色变换。

公开(公告)号：US08451521B2

公开(公告)日：2013-05-28

申请号：US12782362

申请日：2010-05-18

申请人： Martin S. Maltz ,  Raja Bala ,  Yonghui Zhao ,  Matthew Frederick Hoffmann

发明人： Martin S. Maltz ,  Raja Bala ,  Yonghui Zhao ,  Matthew Frederick Hoffmann

IPC分类号： G03F3/08

CPC分类号： H04N1/6019

摘要： What is disclosed is a novel system and method for converting a set of L*a*b* values to CMYK color space in which all CMYK formulations that produce each L*a*b* value are found and enumerated. The CMYK formulations are found through a search algorithm starting with the lightest L*a*b* values then visiting neighboring L*a*b* values until the entire L*a*b* color set has been processed. The CMYK space is tessellated into a set of pentahedrons, and for each L*a*b* value, an enclosing pentahedron is found and the CMYK values corresponding to where the locus of this point penetrates each surface is recorded. Adjacent pentahedrons are then visited and this process continues until the gamut boundary is reached. The result is a piecewise linear representation of the CMYK locus containing all values that will give the target L*a*b* value. The present method provides a flexible and powerful approach for solving color management problems.

摘要翻译： 所公开的是用于将一组L * a * b *值转换为CMYK颜色空间的新型系统和方法，其中发现并列举了产生每个L * a * b *值的所有CMYK公式。 通过搜索算法找到CMYK公式，从最轻的L * a * b *值开始，然后访问相邻的L * a * b *值，直到整个L * a * b *颜色集合被处理。 CMYK空间被镶嵌成一组五面体，并且对于每个L * a * b *值，找到一个包围的五面体，并且记录与该点的轨迹穿过每个表面的位置相对应的CMYK值。 然后访问相邻的五面体，并且该过程继续，直到达到色域边界。 结果是包含将给出目标L * a * b *值的所有值的CMYK轨迹的分段线性表示。 本方法为解决颜色管理问题提供了灵活而强大的方法。

公开(公告)号：US20120212752A1

公开(公告)日：2012-08-23

申请号：US13029753

申请日：2011-02-17

申请人： Yao Rong Wang ,  Lalit Keshav Mestha ,  Martin S. Maltz

发明人： Yao Rong Wang ,  Lalit Keshav Mestha ,  Martin S. Maltz

IPC分类号： H04N1/60

CPC分类号： H04N1/6016 ,  H04N1/40006

摘要： What is disclosed is a system and method which addresses the problem of inheriting color management intent from a fleet color management LUT into a 4-to-4 cascaded LUT. The LUT is updated starting with a set of patches that either form a uniform or non-uniform grid of the LUT or can be projected to a uniform or non-uniform grid in the CMYK space using, e.g., PCA. A set of L*a*b* target as well a variable that serve the purpose of preserving the GCR and other elements of the fleet profile is obtained by passing the set of CMYK values to the fleet printer model. By iterating on the printer (or the printer model of the engine at the moment of the engine change) and converging to the targets, the engine device cmyk set is obtained. The LUT is formed between the uniform or non-uniform gridded CMYK and the device cmyk.

摘要翻译： 公开的是一种系统和方法，其解决将车队颜色管理LUT的颜色管理意图从继承到4对4级联LUT的问题。 LUT以从LUT的统一或非均匀网格形成的一组补丁开始更新，或者使用例如PCA将其投影到CMYK空间中的均匀或非均匀网格。 通过将一组CMYK值传递给车队打印机模型，获得一组L * a * b *目标以及用于保存GCR和船队简档的其他元素的变量。 通过在打印机（或发动机更换时刻的发动机的打印机型号）上迭代并收敛到目标，获得发动机装置cmyk组。 LUT在均匀或不均匀的网格CMYK和设备cmyk之间形成。

公开(公告)号：US07965421B2

公开(公告)日：2011-06-21

申请号：US12103978

申请日：2008-04-16

申请人： Zhigang Fan ,  Reiner Eschbach ,  Martin S. Maltz ,  Judith Stinehour

发明人： Zhigang Fan ,  Reiner Eschbach ,  Martin S. Maltz ,  Judith Stinehour

IPC分类号： H04N1/40

CPC分类号： H04N1/4095

摘要： A show-through reduction method is disclosed. The method is designed to deal with both light and severe show-through. The method focuses mostly on text documents, with characters possibly appearing in multiple gray levels, although the method can also be extended to color documents. As in the prior art, the front and back pages are processed in pairs. However, no perfect page alignment is assumed here, since we are dealing with real images. Instead, a front and back registration is performed as the first step before the pages are further analyzed. In this method, we are aligning the front page content with its show-through appearing in the back side, and the back page content with its show-through appearing in the front side. Once the two sides are aligned, masks are generated for both sides to differentiate severe show-through and light color content regions. Finally, different TRCs are applied to different regions. The show-through is reduced and the page contents are retained.

摘要翻译： 公开了一种透视简化方法。 该方法旨在处理轻型和重型展示。 该方法主要集中在文本文档上，字符可能出现在多个灰度级，尽管该方法也可以扩展到彩色文档。 如现有技术那样，前页和后页成对处理。 然而，在这里假设没有完美的页面对齐，因为我们正在处理真实的图像。 相反，在进一步分析页面之前，执行正面和背面注册作为第一步。 在这种方法中，我们正在将首页内容与其后面的显示对齐，后端页面的内容与其显示出现在前面。 一旦双方对齐，双方将产生掩模，以区分严重的透明和浅色内容区域。 最后，不同的TRC应用于不同的地区。 展示次数减少，页面内容保留。

公开(公告)号：US20090296153A1

公开(公告)日：2009-12-03

申请号：US12127473

申请日：2008-05-27

申请人： Yao Rong Wang ,  Alvaro Enrique Gil ,  Lalit Keshav Mestha ,  Martin S. Maltz

发明人： Yao Rong Wang ,  Alvaro Enrique Gil ,  Lalit Keshav Mestha ,  Martin S. Maltz

IPC分类号： H04N1/40 ,  G06F15/00

CPC分类号： H04N1/6022 ,  H04N1/603

摘要： This disclosure provides methods, apparatus and systems for generating a multidimensional printer profile for a color printer. Specifically, the disclosure provides a method to blend multiple GCR functions or strategies to produce a final GCR blended printer profile, for example a printer profile LUT.

摘要翻译： 本公开提供了用于生成彩色打印机的多维打印机配置文件的方法，装置和系统。 具体地，本公开提供了一种混合多个GCR功能或策略以产生最终的GCR混合打印机配置文件的方法，例如打印机配置文件LUT。

公开(公告)号：US20090080041A1

公开(公告)日：2009-03-26

申请号：US11860631

申请日：2007-09-25

申请人： Zhigang Fan ,  Martin S. Maltz ,  Lalit Keshav Mestha ,  Yao Rong Wang ,  Alvaro E. Gil

发明人： Zhigang Fan ,  Martin S. Maltz ,  Lalit Keshav Mestha ,  Yao Rong Wang ,  Alvaro E. Gil

IPC分类号： G03F3/00

CPC分类号： H04N1/60 ,  H04N1/6019

摘要： Linear transformations of L*a*b* color space are provided to minimize interpolation errors when performing multi-dimensional color space conversions involving lookup tables. Methods are provided for linear transformations (e.g., rotation and shear) to substantially fir the sampling grid to a given printer gamut.

摘要翻译： 提供L * a * b *颜色空间的线性变换，以便在执行涉及查找表的多维颜色空间转换时，最小化插补误差。 提供了用于线性变换（例如旋转和剪切）以将采样网格基本上冷却到给定的打印机色域的方法。