公开(公告)号：US20100040282A1

公开(公告)日：2010-02-18

申请号：US12191721

申请日：2008-08-14

申请人： Raja Bala ,  Reiner Eschbach ,  Yonghui Zhao

发明人： Raja Bala ,  Reiner Eschbach ,  Yonghui Zhao

IPC分类号： G06K9/00

CPC分类号： G06K9/38 ,  G06K2009/0059 ,  G06K2209/01 ,  G06T7/11 ,  G06T7/155 ,  G06T7/194 ,  G06T2207/10008 ,  G06T2207/20036 ,  G07D7/005

摘要： A method and system for identifying a fluorescence mark in a printed document includes using an image acquisition device to derive an input digital image that represents a printed document including a background and a fluorescence mark adjacent the background. The input digital image includes multiple color channel digital images, with each color channel digital image comprising a plurality of pixels each defined by a gray value. For each pixel of at least one of the color channel digital images, the gray value is adjusted based upon a variance of adjacent pixel gray values to define a filtered digital image including a plurality of pixels each defined by an adjusted gray value. Some pixels of the filtered digital image correspond to low variance regions of the input digital image and other pixels of the filtered digital image correspond to high variance regions of the input digital image. A binary image is derived that represents the filtered digital image by mapping each adjusted gray value of the filtered image to either a first or second possible binary pixel value. The binary image includes a binary representation of the fluorescence mark and a binary representation of the background. At least one morphological operation is performed on the binary image to adjust the pixel values of the binary representation of the background so that all pixel values of the binary representation of the background are opposite the binary pixel value used for the binary representation of the fluorescence mark. An ASCII character for the binary representation of the fluorescence mark (or each constituent character thereof) can be derived and compared to a known security code to authenticate the printed document.

摘要翻译： 用于识别印刷文档中的荧光标记的方法和系统包括使用图像获取装置来导出表示包括背景的印刷文档和邻近背景的荧光标记的输入数字图像。 输入数字图像包括多个彩色通道数字图像，每个彩色通道数字图像包括由灰度值定义的多个像素。 对于至少一个颜色通道数字图像的每个像素，基于相邻像素灰度值的方差来调整灰度值，以定义包括由调整的灰度值定义的多个像素的滤波数字图像。 滤波数字图像的一些像素对应于输入数字图像的低方差区域，并且滤波数字图像的其他像素对应于输入数字图像的高方差区域。 导出二进制图像，其通过将滤波图像的每个经调整的灰度值映射到第一或第二可能二进制像素值来表示经滤波的数字图像。 二进制图像包括荧光标记的二进制表示和背景的二进制表示。 对二进制图像执行至少一个形态学操作以调整背景的二进制表示的像素值，使得背景的二进制表示的所有像素值与用于荧光标记的二进制表示的二进制像素值相反 。 可以导出用于荧光标记（或其每个构成字符）的二进制表示的ASCII字符，并将其与已知的安全代码进行比较以验证打印文档。

公开(公告)号：US07652791B2

公开(公告)日：2010-01-26

申请号：US11488355

申请日：2006-07-18

申请人： Ann L. McCarthy ,  Edul N. Dalal ,  Wencheng Wu ,  Dale R. Mashtare ,  Raja Bala

发明人： Ann L. McCarthy ,  Edul N. Dalal ,  Wencheng Wu ,  Dale R. Mashtare ,  Raja Bala

IPC分类号： G06F3/12

CPC分类号： H04N1/6055 ,  G06F3/1204 ,  G06F3/1208 ,  G06F3/1234 ,  G06F3/1273 ,  H04N1/40006 ,  H04N1/6011

摘要： Consistency of document reprints is improved by recording characteristics of a reference printing system used to produce a reference printing of a document, determining related characteristics of a reprint printing system, retrieving the recorded characteristics and compensating for differences between the reference system and the reprint system in the reprint system prior to using the reprint system to produce reprints of the document. Analytical test prints (TPs) are produced with the respective printing systems in close temporal association to the production of the respective reference prints and reprints. TPs can be customized according to aspects of the document. TP customization allows the compensation to address aspects of the printing systems that have a bearing on perceived consistency in the reprints. TPs can be customized with regard to colors in test patches or both the colors and locations of test patches on a page. Compensation is based on measurements of the TPs.

摘要翻译： 通过记录用于生成文档的参考打印的参考打印系统的特性来改进文档重印的一致性，确定重印打印系统的相关特征，检索记录的特性并补偿参考系和重印系统之间的差异 在重印系统使用转印系统之前，重印系统可以重印本文档。 分析测试印刷品（TP）与相应的印刷系统一起生产，与相应的参考印刷品的印刷和重印相关。 TP可以根据文档的方面进行定制。 TP定制允许补偿来处理与重印中感知到的一致性有关的打印系统的方面。 TP可以针对测试补丁中的颜色或页面上测试补丁的颜色和位置进行定制。 补偿是基于TP的测量。

公开(公告)号：US20090180152A1

公开(公告)日：2009-07-16

申请号：US12013664

申请日：2008-01-14

申请人： Raja Bala ,  Shen-Ge Wang ,  Reiner Eschbach

发明人： Raja Bala ,  Shen-Ge Wang ,  Reiner Eschbach

IPC分类号： H04K1/00 ,  G06K9/00

CPC分类号： H04N1/44 ,  H04N1/387 ,  H04N1/405 ,  H04N1/4055 ,  H04N1/52

摘要： A method for encryption of a digital watermark by intelligent halftoning includes receiving image data that define at least a portion of a document to be printed in terms of at least three halftone images corresponding respectively to three printing colorants, each of the three halftone images comprising a plurality of halftone cells. The image data are modified by phase-shifting some of the halftone cells of at least one of the halftone images relative to the other halftone images to encode a watermark within the portion of the document such that the at least one phase-shifted halftone image includes a phase-shifted region and a non-phase-shifted region. The modified image data are used to print the portion of the document on a substrate that will fluoresce when subjected to UV illumination. The printed portion of the document includes a first printed pattern resulting from the phase-shifted region and a second printed pattern resulting from the non-phase-shifted region. The first and second patterns of the printed portion of the document appear substantially similar when the portion of the document is viewed in visible light, and appear dissimilar when the portion of the document is viewed in UV light such that the watermark encoded in the modified image data is perceptible when the portion of the document is viewed in UV light and is hidden when the portion of the document is viewed in visible light.

摘要翻译： 通过智能半色调对数字水印进行加密的方法包括接收图像数据，该图像数据限定要分别对应于三个打印着色剂的至少三个半色调图像要打印的文档的至少一部分，三个半色调图像中的每一个包括一个 多个半色调细胞。 图像数据通过相对于其他半色调图像相移至少一个半色调图像的半色调单元来对文档的该部分内的水印进行相位改变，使得至少一个相移半色调图像包括 相移区域和非相移区域。 经修改的图像数据用于将文档的部分打印在经受UV照射时将发荧光的基底上。 文档的打印部分包括由相移区域产生的第一印刷图案和由非相移区域产生的第二印刷图案。 当文件的部分在可见光中观看时，文档的打印部分的第一和第二图案看起来基本相似，并且当在UV光中观看文档的部分时，显示不相似，使得编码在修改图像中的水印 当文档的部分在紫外光下观看时，数据是可感知的，并且当在可见光中观看文档的部分时，数据被隐藏。

公开(公告)号：US07511860B2

公开(公告)日：2009-03-31

申请号：US10988555

申请日：2004-11-16

申请人： R. Victor Klassen ,  Raja Bala

发明人： R. Victor Klassen ,  Raja Bala

IPC分类号： H04N1/40

CPC分类号： G06T1/0021 ,  H04N1/6058

摘要： Systems and methods preserve the information lost in gamut-mapping during marking (e.g., printing) such that the lost information survives the marking and recapture (e.g. scanning) process. Generally, an encoding method may include gamut-mapping and image for a particular device; determining a residual image; and embedding the information needed to recover the residual image within the pixels of the gamut-mapped image. Generally, a decoding method may include extracting the embedded information from the image; and using the residual image to restore the gamut-mapped image to the original image.

摘要翻译： 系统和方法在标记（例如打印）期间保留在色域映射中丢失的信息，使得丢失的信息在标记和重新捕获（例如扫描）过程中存活。 通常，编码方法可以包括用于特定设备的色域映射和图像; 确定残差图像; 并且嵌入在色域映射图像的像素内恢复残留图像所需的信息。 通常，解码方法可以包括从图像中提取嵌入信息; 并使用残差图像将色域映射的图像恢复到原始图像。

公开(公告)号：US20090067017A1

公开(公告)日：2009-03-12

申请号：US11853652

申请日：2007-09-11

申请人： Vishal Monga ,  Raja Bala

发明人： Vishal Monga ,  Raja Bala

IPC分类号： G03F3/00 ,  G06K9/00

CPC分类号： G09G5/06 ,  G09G2340/10 ,  H04N1/6019

摘要： The proposed systems and methods automatically select the node locations of a multi-dimensional lookup table transformation in accordance with the relative importance of multi-dimensional input values. Such importance, as an example could be quantified by the statistical distribution of the input data. Additionally, the proposed scheme is efficient and works for inputs of arbitrary dimensionality. Finally, the proposed method accounts the characteristics of the input-data and the geometry of the input space. The proposed systems and methods are generally applicable to a large number of practical scenarios including, but not limited to, color imaging applications where input adaptive color look-up tables are desired.

摘要翻译： 所提出的系统和方法根据多维输入值的相对重要性自动选择多维查找表变换的节点位置。 作为示例的重要性可以通过输入数据的统计分布来量化。 此外，所提出的方案是有效的，适用于任意维度的输入。 最后，提出的方法考虑了输入数据的特征和输入空间的几何。 所提出的系统和方法通常适用于大量实际场景，包括但不限于期望输入自适应颜色查找表的彩色成像应用。

公开(公告)号：US20090021587A1

公开(公告)日：2009-01-22

申请号：US11880052

申请日：2007-07-19

申请人： David Snyderman ,  Geoffrey John Woolfe ,  Raja Bala

发明人： David Snyderman ,  Geoffrey John Woolfe ,  Raja Bala

IPC分类号： H04N5/225

CPC分类号： H04N9/73 ,  G01J3/10 ,  G01J3/50 ,  G01J3/506 ,  G01J3/524 ,  G09G2320/0693 ,  H04N17/02

摘要： A computer program product and method for calibrating and characterizing a color display perform calibrating and characterizing steps. A light source is operated in order to emit light from one or more light emitters on the light source. A color capture device, e.g., a digital camera, is calibrated and characterized based on the emitted light. Then, color images are displayed on the color display and captured on the color capture device. The color display is calibrated and characterized based on the captured color images. Computer program instructions are recorded on the computer readable medium, and are executable by a processor, for performing the calibrating and characterizing steps. A method for generating a controlled light source includes displaying light source selections to a user and receiving a user light source selection. Selected light emitters produce a light output matching the user light source selection.

摘要翻译： 用于校准和表征彩色显示器的计算机程序产品和方法执行校准和表征步骤。 操作光源以便从光源上的一个或多个光发射器发射光。 基于发射的光来校准和表征彩色捕获装置，例如数字照相机。 然后，彩色图像被显示在彩色显示器上并捕获在彩色捕获装置上。 基于捕获的彩色图像校准和表征彩色显示。 计算机程序指令被记录在计算机可读介质上，并且可由处理器执行，用于执行校准和表征步骤。 用于产生受控光源的方法包括向用户显示光源选择并接收用户光源选择。 所选择的发光体产生与用户光源选择相匹配的光输出。

公开(公告)号：US20080239344A1

公开(公告)日：2008-10-02

申请号：US11694960

申请日：2007-03-31

申请人： Shen-ge Wang ,  Raja Bala ,  Willey Huaili Wang

发明人： Shen-ge Wang ,  Raja Bala ,  Willey Huaili Wang

IPC分类号： G06K15/00

CPC分类号： G06K15/02 ,  B41J29/393 ,  G06K15/027 ,  H04N1/4015 ,  H04N1/6033

摘要： Methods and systems are presented for calibrating or characterizing a color printer or determining the color response of a color printer to combat spatial non-uniformity, in which color patches are printed on a test page according to an input matrix of input color in a printer-dependent-color space and the test page is measured to provide a corresponding output matrix of output color in a printer-independent-color space. Initial forward and inverse color transforms between the input and the output colors are generated based on the input and the output matrices. The output values are mapped to the input color space based on the initial inverse transform to form a feedback matrix, and spatial non-uniformities present in the printed test page are estimated according to noise values derived from the input matrix and the feedback matrix. The input matrix is modified according to the estimated spatial non-uniformity to form a modified input matrix of input color, and final forward and inverse transforms are generated for the color printer according to the modified input matrix and the output matrix.

摘要翻译： 呈现用于校准或表征彩色打印机的方法和系统，或者确定彩色打印机的颜色响应以对抗空间不均匀性，其中根据打印机的输入颜色的输入矩阵将色块打印在测试页上。 测量依赖颜色空间并测试测试页面，以在独立于打印机的颜色空间中提供输出颜色的相应输出矩阵。 基于输入和输出矩阵生成输入和输出颜色之间的初始正向和反向颜色变换。 基于初始反变换将输出值映射到输入颜色空间以形成反馈矩阵，并且根据从输入矩阵和反馈矩阵导出的噪声值来估计印刷测试页面中存在的空间非均匀性。 输入矩阵根据估计的空间不均匀性进行修改，形成输入颜色的修改输入矩阵，根据修改的输入矩阵和输出矩阵，为彩色打印机生成最终的正向和反向变换。

公开(公告)号：US20080199785A1

公开(公告)日：2008-08-21

申请号：US11708313

申请日：2007-02-20

申请人： Raja Bala ,  Reiner Eschbach

发明人： Raja Bala ,  Reiner Eschbach

IPC分类号： G03F1/00

CPC分类号： B41M3/144 ,  B41M3/14

摘要： A method is provided for creation of a substrate fluorescence mask having background color(s), UV mark color(s), and distraction color(s), to be printed as an image on a substrate containing optical brightening agents. The method includes selecting one or more UV mark colors for the mask such that the UV mark colors exhibit low contrast against the background color(s) under normal illumination and high contrast against the background color(s) under UV illumination. One or more distraction colors are also selected, such that the distraction color(s) exhibit low contrast against the background color(s) under UV illumination and exhibit high contrast against the background color(s) under normal illumination. A distraction pattern, formed from one or more distraction colors, is also selected.

摘要翻译： 提供了一种用于产生具有背景颜色，UV标记颜色和分散颜色的衬底荧光掩模的方法，作为图像印刷在含有荧光增白剂的衬底上。 该方法包括为掩模选择一个或多个UV标记颜色，使得UV标记颜色在正常照明下对背景颜色显示低对比度，并且在UV照射下对背景颜色显示高对比度。 还选择一种或多种分散颜色，使得分散颜色在UV照射下表现出与背景颜色的低对比度，并且在正常照明下显示与背景颜色的高对比度。 还选择由一种或多种分散颜色形成的分散图案。

公开(公告)号：US20080068626A1

公开(公告)日：2008-03-20

申请号：US11522739

申请日：2006-09-18

申请人： Raja Bala ,  Michael Branciforte ,  Reiner Eschbach

发明人： Raja Bala ,  Michael Branciforte ,  Reiner Eschbach

IPC分类号： G03F3/08

CPC分类号： H04N1/6058

摘要： An image characterized by an original image gamut is received in an imaging device characterized by a device gamut. The original image gamut is enhanced to a first set of modified color values that occupy a greater fraction of the device gamut than the original image gamut. The modified color values of each pixel are mapped to new color values within the device gamut.

摘要翻译： 以原始图像色域为特征的图像被接收在以设备色域为特征的成像设备中。 原始图像色域被增强为占原始图像色域的设备色域的更大部分的第一组修改的颜色值。 每个像素的修改颜色值被映射到设备色域内的新颜色值。

公开(公告)号：US07328116B2

公开(公告)日：2008-02-05

申请号：US11119972

申请日：2005-05-02

申请人： Raja Bala ,  Reiner Eschbach ,  Gaurav Sharma

发明人： Raja Bala ,  Reiner Eschbach ,  Gaurav Sharma

IPC分类号： G01D18/00 ,  G01P21/00 ,  G01R35/00

CPC分类号： H04N17/04

摘要： A method is presented for deriving gamma for a display monitor that does not involve color matching tasks. The method includes displaying a test pattern to a user on the display monitor. The test pattern includes at least one of a pattern of alternating light and dark regions displayed to the user at different gamma correction levels, or a grayscale character string displayed to the user at different digital gray levels against a background of two known luminance levels. Input is received from the user as to at least one of a gamma correction level that results in the pattern of alternating light and dark regions having light and dark regions of perceived equal size, or a digital gray level for the grayscale character string that results in maximum legibility of the text string against the two known background luminance levels. Gamma is derived for the display monitor based upon the user input.

摘要翻译： 提出了一种用于导出不涉及颜色匹配任务的显示监视器的伽马的方法。 该方法包括在显示监视器上向用户显示测试图案。 测试图案包括以不同的伽马校正水平显示给用户的交替光和暗区域的模式中的至少一个，或者以两个已知亮度水平的背景在不同的数字灰度级显示给用户的灰度字符串中的至少一个。 从用户接收关于导致具有感知相同大小的亮和暗区域的交替的光和暗区域的图案的灰度校正水平或用于灰度字符串的数字灰度级中的至少一个的输入，其导致 文本串相对于两个已知背景亮度级别的最大可读性。 基于用户输入，导出用于显示监视器的伽马。