公开(公告)号：US20040070776A1

公开(公告)日：2004-04-15

申请号：US10270992

申请日：2002-10-15

Applicant: Xerox Corporation

Inventor： Meng Yao ,  Martin S. Maltz

IPC: H04N001/60

CPC classification number: H04N1/6027

Abstract: A gray balancing technique wherein gray balancing curves are determined by interpolating the primary color data values of color samples to determine discrete combinations of primary colors that substantially match predetermined targets, and performing a curve fitting procedure on the discrete combinations of primary colors to produce gray balancing curves.

Abstract translation: 一种灰度平衡技术，其中通过内插颜色样本的原色数据值来确定基本匹配预定目标的原色的离散组合并且对原色的离散组合执行曲线拟合程序以产生灰度平衡来确定灰平衡曲线 曲线。

公开(公告)号：US20040136014A1

公开(公告)日：2004-07-15

申请号：US10342355

申请日：2003-01-15

Applicant: Xerox Corporation

Inventor： Martin S. Maltz

IPC: H04N001/60

CPC classification number: G06K15/00 ,  H04N1/6025 ,  H04N1/6058

Abstract: Systems and methods are disclosed of a smooth gray component replacement strategy which utilizes the full gamut of a printer device. A CMY to CMYK gray component replacement transform is disclosed which inherently exploits the full gamut of the printer, by transforming points in CMY cube to L*a*b* color space, scaling the obtained values so they fill the maximum gamut obtainable with the printer device and calculating the CMYK values needed to obtain the scaled L*a*b* values. The CMY to CMYK transform is then smoothed with an averaging filter that does not change CMYK values at the corners. The entire color gamut is adequately sampled and small changes in CMY do not produce large jumps in L*a*b*.

Abstract translation: 公开了利用打印机设备的全色域的平滑灰色组件替换策略的系统和方法。 公开了CMY到CMYK灰色组件替换变换，其通过将CMY多维数据集中的点转换为L * a * b *颜色空间来固有地利用打印机的全色域，缩放所获得的值，使得它们填充由打印机可获得的最大色域 并计算获得缩放的L * a * b *值所需的CMYK值。 然后使用不改变拐角处的CMYK值的平均滤波器平滑CMY到CMYK变换。 整个色域被充分采样，CMY的小变化不会在L * a * b *中产生大的跳跃。

公开(公告)号：US20040257619A1

公开(公告)日：2004-12-23

申请号：US10462966

申请日：2003-06-17

Applicant: Xerox Corporation

Inventor： Robert P. Loce ,  Martin S. Maltz ,  Jay S. Grzenda

IPC: H04N001/52 ,  G06T007/00

CPC classification number: H04N1/40075

Abstract: What is disclosed is an image path that advantageously uses halftone classification to select appropriate mappings in gray-scale management and color management operations. The tags generated in the scanner help identify different classes of halftones. One is selected from several pixel-value mappings to provide proper compensation. That is, the one-dimensional and multi-dimensional pixel-value mappings within the color management module are selected based on halftone classification tags from the scanner. The tagging is either one bit that indicates nullLow Frequency Halftonenull and nullNot LFHTnull, or, more preferably, the tag is multi-bit indicating a frequency bin that contains the frequency of the input halftone. Additionally, the multi-bit tag can indicate particular halftone screen types, such as dot screens, line screens, stochastic screens or error diffusion. The pixel value mappings are typically implemented as Look-Up Tables (LUTs), and the LUTs of the present invention are optimized for the various halftone classes. Generation of the LUTs, or other pixel-value mappings, is non-trivial in that such mappings are normally applied to contone images and not to blurred halftoned images. The pixel-value mappings of the present invention are derived via an iterative process. Alternatively, a model for this modulated image type is used.

Abstract translation: 公开的是图像路径，其有利地使用半色调分类来选择灰度管理和颜色管理操作中的适当映射。 扫描仪中生成的标签有助于识别不同类别的半色调。 从几个像素值映射中选择一个来提供适当的补偿。 也就是说，基于来自扫描仪的半色调分类标签来选择颜色管理模块内的一维和多维像素值映射。 标签是指示“低频半色调”和“不LFHT”的一个位，或者更优选地，标签是多位，指示包含输入半色调的频率的频率仓。 此外，多位标签可以指示特定的半色调屏幕类型，例如点屏幕，线屏幕，随机屏幕或错误扩散。 像素值映射通常被实现为查找表（LUT），并且本发明的LUT针对各种半色调类进行了优化。 LUT的生成或其他像素值映射是不重要的，因为这样的映射通常被应用于连续色调图像而不是模糊的半色调图像。 本发明的像素值映射通过迭代处理得到。 或者，使用用于该调制图像类型的模型。

公开(公告)号：US20040257595A1

公开(公告)日：2004-12-23

申请号：US10465408

申请日：2003-06-18

Applicant: Xerox Corporation

Inventor： Gaurav Sharma ,  Raja Bala ,  Jean-Pierre R.M Van de Capelle ,  Martin S. Maltz ,  Lalit K. Mestha

IPC: H04N001/50 ,  H04N001/56

CPC classification number: H04N1/50 ,  G09G5/04 ,  G09G2320/0276 ,  G09G2320/0693 ,  H04N1/603

Abstract: A color output device is generally driven by at least three independent control signals for control of its response. A desired response in device independent color space is normally obtained by employing a cascade consisting of a characterization transform and calibration transform. The calibration transform transforms input control variables into output control variables that are directly used to drive the device. Input control variables can be transformed into intermediate control variables, which can be then mapped to output control variables utilizing a two-dimensional transformation. The two-dimensional calibration architecture provides improved control functionality and flexibility.

Abstract translation: 颜色输出装置通常由至少三个独立的控制信号驱动，以控制其响应。 通常通过使用由特征变换和校准变换组成的级联来获得器件独立色彩空间中的期望响应。 校准变换将输入控制变量转换为直接用于驱动器件的输出控制变量。 输入控制变量可以转换为中间控制变量，然后可以使用二维变换将其映射到输出控制变量。 二维校准架构提供了改进的控制功能和灵活性。

公开(公告)号：US20040136015A1

公开(公告)日：2004-07-15

申请号：US10342873

申请日：2003-01-15

Applicant: XEROX CORPORATION

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

IPC: H04N001/60 ,  H04N001/52

CPC classification number: H04N1/4078 ,  H04N1/6033

Abstract: 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.

Abstract translation: 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：US20040070775A1

公开(公告)日：2004-04-15

申请号：US10270966

申请日：2002-10-15

Applicant: Xerox Corporation

Inventor： Meng Yao ,  Martin S. Maltz

IPC: H04N001/60

CPC classification number: H04N1/6022

Abstract: A gray balancing technique wherein color data values are modified only if the color data values include a gray component.

Abstract translation: 一种灰度平衡技术，其中仅当颜色数据值包括灰色分量时才对颜色数据值进行修改。

公开(公告)号：US20030132984A1

公开(公告)日：2003-07-17

申请号：US10046156

申请日：2002-01-16

Applicant: XEROX CORPORATION

Inventor： Martin S. Maltz

IPC: B41J029/393

CPC classification number: H04N1/6058 ,  H04N1/6025

Abstract: The invention provides a system and method for reducing or eliminating kinks in ink limit conversion processes. In particular, an adjusted ink limit conversion process is provided which approaches the limit in a smooth fashion. Moreover, extrapolated values in the input, values that are outside of a predetermined range, are handled in a smooth fashion. The extrapolated values are used to avoid kinks in the conversion process at the end bounds of the range. Ink limiting is performed gradually as the system approaches the ink limit, avoiding sudden changes in the slope of the system response characteristics. If one of a plurality of colors reaches zero ink, the remaining colors are decreased by multiplying them by a factor less than one. Accordingly, the colorant ratio is maintained, and hue shifts are reduced.

Abstract translation: 本发明提供了用于减少或消除墨水极限转换过程中的扭结的系统和方法。 特别地，提供了调整的墨水极限转换处理，以平滑的方式接近极限。 此外，输入中的外推值处于预定范围之外，以平滑的方式处理。 外推值用于避免在范围结束范围内的转换过程中的扭结。 随着系统接近墨水极限，逐渐执行墨水限制，避免系统响应特性的斜率突然变化。 如果多个颜色中的一个颜色达到零墨水，则通过将其乘以小于1的因子来减少剩余的颜色。 因此，保持着色剂比例，并降低色相偏移。

公开(公告)号：US20030048478A1

公开(公告)日：2003-03-13

申请号：US09947838

申请日：2001-09-05

Applicant: Xerox Corporation

Inventor： Shirley Cheng ,  Mark A. Gwaltney ,  Robert P. Loce ,  Martin S. Maltz ,  Connie F. Purdum

IPC: H04N001/405 ,  G06K015/00 ,  G03F003/08

CPC classification number: H04N1/4078

Abstract: Method, system and computer-readable medium containing instructions for performing halftone gamma correction in a printing environment to achieve and maintain high print quality. The system includes one or more subsystems, including a tone reproduction subsystem that creates one or more print calibration pages, each having a tone curve defining a relationship between a plurality of input color levels, output color levels and a level of measured darkness. A pixel adjustment subsystem associates each input color level with one of the output color levels based on a desired percentage change in the level of measured darkness. Further, a gamma correction system performs gamma correction on a selected tone curve of one of the print calibration pages by associating each input color level with one of the output color levels based on the desired percentage change in the level of measured darkness in a substantially flat region of the selected tone curve.

Abstract translation: 包含用于在打印环境中执行半色调伽马校正的指令以实现和保持高打印质量的方法，系统和计算机可读介质。 该系统包括一个或多个子系统，包括创建一个或多个打印校准页面的色调再现子系统，每个打印校准页面具有定义多个输入颜色级别，输出颜色级别和测量黑暗级别之间的关系的色调曲线。 像素调整子系统基于所测量的黑暗级别的期望百分比变化将每个输入颜色级别与输出颜色级别之一相关联。 此外，伽马校正系统通过将每个输入颜色级别与输出颜色级别之一相关联，基于在基本平坦的测量黑暗级别中的期望百分比变化，对所选择的打印校准页面之一的色调曲线进行伽马校正 所选色调曲线的区域。

公开(公告)号：US20020140956A1

公开(公告)日：2002-10-03

申请号：US09817186

申请日：2001-03-27

Applicant: XEROX CORPORATION

Inventor： Martin S. Maltz

IPC: G06K015/02 ,  H04N001/48 ,  H04N001/58 ,  H04N001/407 ,  H04N001/409

CPC classification number: H04N1/407 ,  H04N1/6027

Abstract: The tone reproduction curve is smoothed to eliminate or reduce artifacts due to abrupt changes in the final system tone reproduction curve. As the tone reproduction curve approaches an end point, it is modified, if necessary, so that the angle between a tangent to the tone reproduction curve at a point, and a line from that point to the end point is less than a threshold value. The end point is considered to be a corner of a box, the threshold value is a function of the distance from the point to the nearest of the walls of the corner, and the threshold value goes to zero as the distance to the wall goes to zero. Thus, the tone reproduction curve is guided to the end point in a smooth and monotonic fashion.

Abstract translation: 平滑色调再现曲线以消除或减少由于最终系统色调再现曲线中的突然变化引起的伪像。 当色调再现曲线接近终点时，如果需要，其被修改为使得一点处的色调再现曲线的切线与从该点到终点的线之间的角度小于阈值。 终点被认为是箱子的一角，阈值是从点到最接近角落的距离的函数，并且随着与墙的距离变为零，阈值变为零 零。 因此，音调再现曲线以平滑和单调的方式被引导到终点。