公开(公告)号：US20040165199A1

公开(公告)日：2004-08-26

申请号：US10372558

申请日：2003-02-25

Applicant: Xerox Corporation

Inventor： R. Victor Klassen ,  Raja Bala

IPC: H04N001/58

CPC classification number: H04N1/6033

Abstract: A method includes forming a plurality of test patches in an array of orthogonal rows. The test patches are formed by using at least one printhead in an imaging machine. Each of the test patches is associated with a respective one of a plurality of initial input color values. The array of test patches includes a plurality of rows of varied-input test patches and at least one row of first equivalent-input test patches. A respective output color value of each of the test patches is measured. At least one first mathematical relationship is generated based on the output color values of the at least one row of first equivalent-input test patches. A plurality of adjusted input color values are calculated for respective ones of the varied-input test patches. Each adjusted input color value is calculated based upon the generated at least one first mathematical relationship. A second mathematical relationship is computed between the adjusted input color values and the output color values. The imaging machine is calibrated by using the second mathematical relationship.

Abstract translation: 一种方法包括在正交行阵列中形成多个测试块。 测试贴片通过在成像机中使用至少一个打印头来形成。 每个测试补丁与多个初始输入颜色值中的相应一个相关联。 测试补丁阵列包括多行不同输入的测试补丁和至少一行第一等效输入测试补丁。 测量每个测试片的相应输出颜色值。 基于至少一行第一等效输入测试片的输出颜色值生成至少一个第一数学关系。 针对各个输入的测试块中的各个来计算多个调整的输入颜色值。 基于产生的至少一个第一数学关系来计算每个调整的输入颜色值。 在调整的输入颜色值和输出颜色值之间计算第二数学关系。 成像机通过使用第二数学关系进行校准。

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：US20030063097A1

公开(公告)日：2003-04-03

申请号：US09966030

申请日：2001-09-28

Applicant: XEROX CORPORATION

Inventor： Salil Prabhakar ,  Raja Bala ,  Hui Cheng ,  John C. Handley ,  Ying-wei Lin

IPC: G09G005/02

CPC classification number: G06T7/90 ,  G06T7/11 ,  G06T2207/30176

Abstract: A process for color graphics image processing, related to detection and segmentation of sweeps, is provided. An input graphics image is transformed into a three-dimensional histogram in an appropriate color space 104 (e.g., CIELUV). Two-dimensional histograms are estimated from the three-dimensional histogram 106. The two-dimensional histograms are processed to detect and segment sweeps 108. Sweep segment information from the processing of the two-dimensional histograms is combined 110. The combined sweep segment information is used to process the input graphics image to identify and segment sweeps 112. Post-processing may be optionally and selectively used to reject false alarms (i.e., areas falsely identified as sweeps) 114.

Abstract translation: 提供了与扫描的检测和分割相关的彩色图形图像处理的过程。 将输入图形图像转换成适当颜色空间104（例如，CIELUV）中的三维直方图。 从三维直方图106估计二维直方图。处理二维直方图以检测和分割扫描108.组合来自二维直方图的处理的扫描段信息。组合的扫描段信息是 用于处理输入图形图像以识别和分段扫描112.可以可选地和选择性地使用后处理来拒绝假警报（即，被错误地识别为扫描的区域）114。

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：US20040257378A1

公开(公告)日：2004-12-23

申请号：US10465437

申请日：2003-06-19

Applicant: Xerox Corporation

Inventor： Karen M. Braun ,  Raja Bala

IPC: G09G005/02

CPC classification number: G09G5/028 ,  G06K15/02 ,  G06K15/1825 ,  H04N1/40012

Abstract: What is disclosed is an image processing method for enabling one to print color graphics and other recognizable objects on monochrome printers while retaining color differences. More specifically, the present method is for preserving color discriminability in a grayscale representation. The method involves first sorting colors according to at least one characteristic dimension of a color space such as lightnesses. The color space preferably is a luminance-chrominance color space, although others are envisioned. The sorted colors are adjusted by a metric appropriate to the color space such that the metric imparts a degree of distinction among the colors along the chosen characteristic dimension. The spacing between two adjacent sorted colors can be constant, or weighted by the total color difference between the two colors in the original color space. Color difference can be calculated using for example nullE*ab, nullE*LCh, nullE*94, or DE2000 metrics. Once the colors have been adjusted, they are converted to the monochrome representation using straightforward techniques.

Abstract translation: 所公开的是一种用于使得能够在保持颜色差异的同时在单色打印机上打印彩色图形和其他可识别对象的图像处理方法。 更具体地，本方法用于保持灰度表示中的颜色辨别性。 该方法包括首先根据诸如亮度的颜色空间的至少一个特征尺寸来分类颜色。 颜色空间优选地是亮度 - 色度色彩空间，尽管其他设想也是如此。 分类颜色通过适合于颜色空间的度量来调整，使得度量赋予沿所选特征维度的颜色之间的一定程度的区别。 两个相邻排序颜色之间的间距可以是常数，或者由原始颜色空间中的两种颜色之间的总色差加权。 可以使用例如DeltaE * ab，DeltaE * LCh，DeltaE * 94或DE2000度量来计算色差。 一旦颜色被调整，它们将使用简单的技术转换为单色表示。

公开(公告)号：US20030168582A1

公开(公告)日：2003-09-11

申请号：US10093220

申请日：2002-03-06

Applicant: Xerox Corporation

Inventor： Raja Bala ,  Lalit K. Mestha ,  Robert J. Rolleston

IPC: H01J003/14 ,  H01J005/16

CPC classification number: H04N1/6094 ,  H04N1/603

Abstract: An image transfer apparatus with a scanner and a spectrophotometric sensor interacting logically with the scanner. When the scanner scans a medium containing a color image, the spectrophotometric sensor interacts with the scanner to aid in the automatic selection of a scanner color correction corresponding to the medium being scanned.

Abstract translation: 具有扫描器和分光光度传感器的图像传送装置与扫描仪逻辑地相互作用。 当扫描仪扫描含有彩色图像的介质时，分光光度传感器与扫描仪相互作用，以帮助自动选择与被扫描介质相对应的扫描仪颜色校正。

公开(公告)号：US20030063803A1

公开(公告)日：2003-04-03

申请号：US09965880

申请日：2001-09-28

Applicant: Xerox Corporation

Inventor： Ying-Wei Lin ,  Stuart A. Schweid ,  Jeng-Nan Shiau ,  Raja Bala ,  Zhigang Fan

IPC: G06K009/00

CPC classification number: H04N1/40062 ,  G06K9/00456

Abstract: A method and system for image processing, in conjunction with classification of images between natural pictures and synthetic graphics, using SGLD texture (e.g., variance, bias, skewness, and fitness), color discreteness (e.g., R_L, R_U, and R_V normalized histograms), or edge features (e.g., pixels per detected edge, horizontal edges, and vertical edges) is provided. In another embodiment, a picture/graphics classifier using combinations of SGLD texture, color discreteness, and edge features is provided. In still another embodiment, a nullsoftnull image classifier using combinations of two (2) or more SGLD texture, color discreteness, and edge features is provided. The nullsoftnull classifier uses image features to classify areas of an input image in picture, graphics, or fuzzy classes.

Abstract translation: 一种用于图像处理的方法和系统，结合使用SGLD纹理（例如，方差，偏差，偏度和适应度）的自然图像和合成图像之间的图像分类，颜色离散性（例如，R_L，R_U和R_V归一化直方图 ）或边缘特征（例如，每个检测到的边缘的像素，水平边缘和垂直边缘）。 在另一个实施例中，提供了使用SGLD纹理，颜色离散性和边缘特征的组合的图片/图形分类器。 在另一个实施例中，提供了使用两（2）或更多SGLD纹理，颜色离散性和边缘特征的组合的“软”图像分类器。 “软”分类器使用图像特征来对图像，图形或模糊类中的输入图像的区域进行分类。