公开(公告)号：US08072648B2

公开(公告)日：2011-12-06

申请号：US11881263

申请日：2007-07-26

申请人： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

发明人： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC分类号： H04N1/401 ,  H04N1/405 ,  H04N1/407 ,  H04N1/50 ,  H04N1/52 ,  H04N1/60 ,  G03F3/10

CPC分类号： G06K15/02 ,  G06K15/027 ,  H04N1/52 ,  H04N1/6027 ,  H04N1/6033

摘要： The predicted tone response curve for each color channel and halftone is predicted using a binary printer model and stored, wherein the “predicted tone response curve” provides a model based approximation of the actual response for the printer for each addressable pixel location in the spatial range. Also stored is an “average predicted tone response” by averaging the “predicted tone response curve” over the spatial range of the printer. With the “true average” tone response curve, the “predicted tone response curve”, and the “average predicted tone response curve”, an estimate of the true tone response curve for the color channel can then be mathematically obtained, wherein the true tone response curve defines a predicted actual response for the printer for each addressable print location in the spatial range. The “predicted” and “average” tone response curves are obtained using the 2×2 binary printer model.

摘要翻译： 每个颜色通道和半色调的预测色调响应曲线使用二进制打印机模型预测并存储，其中“预测色调响应曲线”为空间范围内的每个可寻址像素位置提供基于打印机的实际响应的基于模型的近似 。 还通过在打印机的空间范围上对“预测色调响应曲线”进行平均，还存储“平均预测色调响应”。 利用“真实平均”音调响应曲线，“预测音响响应曲线”和“平均预测音响响应曲线”，可以数学地获得颜色通道的真实色调响应曲线的估计，其中真正的音调 响应曲线定义了空间范围内每个可寻址打印位置的打印机预测的实际响应。 使用2×2二进制打印机模型获得“预测”和“平均”音调响应曲线。

公开(公告)号：US08047447B2

公开(公告)日：2011-11-01

申请号：US12436432

申请日：2009-05-06

申请人： Orhan Bulan ,  Vishal Monga ,  Gaurav Sharma

发明人： Orhan Bulan ,  Vishal Monga ,  Gaurav Sharma

IPC分类号： G06K7/00 ,  G06K19/00 ,  G06K19/06 ,  G06K19/08

CPC分类号： G06K7/00 ,  G06K7/14 ,  G06K19/06037

摘要： What is disclosed is a system and method for encoding and decoding data in a color barcode pattern using dot orientation and color separability. The spectral (wavelength) characteristics of the CMY colorants, commonly used in digital printing, and those of RGB sensors are exploited to achieve high capacity data embedding rates in color barcodes. The present method embeds independent data in two different printer colorant channels using dot orientation modulation. In the print end, dots of two colorants occupy the same spatial region. At the detector end, by using the complementary sensor channels to estimate the colorant channels, data is recovered in each colorant channel. The method approximately doubles the capacity of encoding methods based upon a single colorant channel and enables embedding rates which match or exceed that of other hardcopy barcodes known in the arts. The method is robust against inter-separation misregistration with a small symbol error rate.

摘要翻译： 公开的是使用点取向和颜色分离来对彩色条形码图案中的数据进行编码和解码的系统和方法。 通常用于数字印刷的CMY着色剂和RGB传感器的光谱（波长）特性被利用来实现彩色条形码中的高容量数据嵌入率。 本方法使用点取向调制将独立数据嵌入两种不同的打印机着色剂通道。 在打印端，两个着色剂的点占据相同的空间区域。 在检测器端，通过使用互补传感器通道来估计着色剂通道，数据在每个着色剂通道中被回收。 该方法基于单个着色剂通道使编码方法的容量大大增加一倍，并且使嵌入速率匹配或超过本领域已知的其它硬拷贝条形码的嵌入速率。 该方法对于具有小的符号错误率的分离间对位失调是鲁棒的。

公开(公告)号：US08023160B2

公开(公告)日：2011-09-20

申请号：US12207704

申请日：2008-09-10

申请人： Vishal Monga ,  Gaurav Sharma ,  Orhan Bulan

发明人： Vishal Monga ,  Gaurav Sharma ,  Orhan Bulan

IPC分类号： H04N1/405 ,  H04N1/44 ,  G06K15/02 ,  G06K19/06 ,  B41M1/10

CPC分类号： G06K1/121 ,  G06K2019/06234 ,  G06T1/005 ,  G06T2201/0051 ,  G06T2201/0061 ,  H04N1/32203 ,  H04N1/32229 ,  H04N1/32256 ,  H04N1/32352

摘要： What is disclosed is a novel system and method for encoding/decoding data in a cover contone image via halftone dot orientation modulation. Arrays of halftone threshold values are used to determine a desired orientation, e.g. 0/90°+/−45° for a given single data value of the original message to be embedded. Message data is embedded as a function of halftone dot orientation. Detection modeling of the print-scan process enables the determination of dot orientation from the image scan via statistically motivated image moments. A probabilistic model of the print-scan channel conditions received moments on input orientation. Density values of the received moments are used to determine dot orientation for each halftone cell. The embedded data is retrieved based on the determined orientations. The present method is applicable to areas of data embedding, document security, and the like.

摘要翻译： 公开的是通过半色调点取向调制对覆盖连接图像中的数据进行编码/解码的新型系统和方法。 使用半色调阈值数组来确定期望的取向，例如， 对于要嵌入的原始消息的给定单个数据值，0/90°+/- 45°。 消息数据作为半色调点取向的函数进行嵌入。 打印扫描过程的检测建模使得能够通过统计动机的图像时刻从图像扫描确定点取向。 打印扫描通道条件的概率模型在输入方向上接收到力矩。 接收力矩的密度值用于确定每个半色调单元的点取向。 基于确定的取向检索嵌入数据。 本方法适用于数据嵌入，文档安全等领域。

公开(公告)号：US07844117B2

公开(公告)日：2010-11-30

申请号：US11851774

申请日：2007-09-07

申请人： Vishal Monga

发明人： Vishal Monga

IPC分类号： G06K9/00 ,  G06K9/46 ,  G06K9/66 ,  G06K9/36

CPC分类号： G06K9/6215 ,  G06F17/30271

摘要： An image digest based search approach allows images within an image repository related to a query image to be located despite cropping, rotating, localized changes in image content, compression formats and/or an unlimited variety of other distortions. In particular, the approach allows potential distortion types to be characterized and to be fitted to an exponential family of equations matched to a Bregman distance. Image digests matched to the identified distortion types may then be generated for stored images using the matched Bregman distances, thereby allowing searches to be conducted of the image repository that explicitly account for the statistical nature of distortions on the image. Processing associated with characterizing image noise, generating matched Bregman distances, and generating image digests for images within an image repository based on a wide range of distortion types and processing parameters may be performed offline and stored for later use, thereby improving search response times.

摘要翻译： 基于图像摘要的搜索方法允许与查询图像相关的图像存储库内的图像定位，尽管裁剪，旋转，图像内容的局部变化，压缩格式和/或无限多种其他失真。 特别地，该方法允许潜在的失真类型被表征并且被拟合到与伯格曼距离相匹配的指数族方程组。 然后可以使用匹配的Bregman距离为存储的图像生成与所识别的失真类型匹配的图像摘要，从而允许对图像存储库进行搜索，显式地说明图像上的失真的统计特性。 可以基于宽范围的失真类型和处理参数来生成与图像噪声特征化，生成匹配的Bregman距离以及图像储存库内的图像的图像摘要的处理，以供以后使用，从而提高搜索响应时间。

公开(公告)号：US07844116B2

公开(公告)日：2010-11-30

申请号：US11742020

申请日：2007-04-30

申请人： Vishal Monga

发明人： Vishal Monga

IPC分类号： G06K9/00 ,  G06K9/46 ,  G06K9/66 ,  G06K9/36

CPC分类号： G06K9/522

摘要： Images within an image repository related to a selected image may be located despite cropping, rotating, and/or the application of a variety of other distortions to either the selected image and/or images in the image repository. Described exemplary approaches may use image digests produced using a multi-step process. In a first step, a discrete Fourier transform may be applied to produce an M×N frequency-based image matrix from an M×N image matrix containing elements that represent spatial image pixel values. In subsequent steps, matrix approximations may be applied to reduce the M×N frequency-based image matrix and to produce an image digest that reflects the content of the image. Further, an approach is described for generating a search threshold value that may be used to determine whether images digests associated with images in a repository are sufficiently similar to a search digest to be returned in a search result.

摘要翻译： 尽管在图像存储库中对所选择的图像和/或图像进行裁剪，旋转和/或应用各种其他失真，但是与所选择的图像相关的图像储存库内的图像可以被定位。 描述的示例性方法可以使用使用多步骤过程产生的图像摘要。 在第一步骤中，可以应用离散付里叶变换来从包含表示空间图像像素值的元素的M×N图像矩阵中产生基于M×N个频率的图像矩阵。 在随后的步骤中，可以应用矩阵近似以减少基于M×N频率的图像矩阵并产生反映图像内容的图像摘要。 此外，描述了一种用于生成搜索阈值的方法，所述搜索阈值可用于确定与储存库中的图像相关联的图像摘要是否与要在搜索结果中返回的搜索摘要充分相似。

公开(公告)号：US20100238508A1

公开(公告)日：2010-09-23

申请号：US12405737

申请日：2009-03-17

申请人： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

发明人： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC分类号： H04N1/405

CPC分类号： H04N1/6033

摘要： A method and system is disclosed for characterizing a color scanner comprising generating a halftone-independent target of color patches, printing the target on a color hardcopy device, measuring the target to obtain device-independent color values, scanning the target to obtain scanner color values, and building a scanner profile that relates scanned color values to device-independent color values.

摘要翻译： 公开了一种用于表征彩色扫描仪的方法和系统，该彩色扫描仪包括产生色调不依赖于色块的目标，在彩色硬拷贝装置上打印目标，测量目标以获得与装置无关的色彩值，扫描目标以获得扫描仪颜色值 ，并构建扫描仪配置文件，将扫描的颜色值与设备无关的颜色值相关联。

公开(公告)号：US20100182649A1

公开(公告)日：2010-07-22

申请号：US12356897

申请日：2009-01-21

申请人： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

发明人： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC分类号： H04N1/405

CPC分类号： H04N1/6033 ,  H04N1/4078

摘要： A model-based halftone independent method for characterizing a printer equipped with a plural of halftone screens comprises: printing a target set of basic patches comprised of a fundamental binary pattern independent of a halftone screen; measuring true color printer response from the target set; modeling a halftone independent characterization of the printer with the mathematical transformation using the measured response; modeling a first halftone dependent characterization of the printer with the mathematical transformer to generate a first predicted result using a selected halftone screen; comparing a measured response of the printer using the halftone screen with the predicted result to define a correction factor corresponding to the halftone screen; and modeling a halftone dependent characterization of the printer using a predicted response of the fundamental binary pattern and the correction factor.

摘要翻译： 用于表征配备有多个半色调网版的打印机的基于模型的半色调独立方法包括：打印由基本二进制图案独立于半色调屏幕组成的基本色块的目标集合; 测量来自目标组的真彩打印机响应; 使用测量响应的数学变换建模打印机的半色调独立表征; 使用数学变压器对打印机的第一半色调依赖特征进行建模，以使用所选择的半色调屏幕产生第一预测结果; 将使用半色调屏幕的打印机的测量响应与预测结果进行比较，以定义对应于半色调屏幕的校正因子; 以及使用基本二进制模式和校正因子的预测响应对打印机的半色调依赖特征进行建模。

公开(公告)号：US20080218802A1

公开(公告)日：2008-09-11

申请号：US11716283

申请日：2007-03-09

申请人： Vishal Monga ,  Raja Bala

发明人： Vishal Monga ,  Raja Bala

IPC分类号： G06K15/00

CPC分类号： H04N1/6019

摘要： A device calibration method based on two-dimensional calibration transform that allows complete control of two-dimensional planes in the three-dimensional CMY (Cyan, Magenta, and Yellow) cube. Two-dimensional planes can be identified in the three-dimensional CMY cube as a primary plane and projected onto two-dimensional calibration lookup tables (LUTs) for C, M, and Y. The LUTs are filled with CMY colorant values that will maintain a fixed color (e.g. CIELAB) response within the chosen primary planes. There are three possible realizations depending upon which primary diagonal CMY plane is chosen. This technique can be used to calibrate an engine over time and to bring two or more engines to the same desired state.

摘要翻译： 基于二维校准变换的装置校准方法，其允许完全控制三维CMY（青色，品红色和黄色）立方体中的二维平面。 可以将三维CMY立方体中的二维平面识别为主平面并且投影到用于C，M和Y的二维校准查找表（LUT）上。LUT用CMY着色剂值填充，其将保持 所选主平面内的固定颜色（如CIELAB）响应。 根据哪个主对角CMY平面被选择，有三种可能的实现。 这种技术可用于随时间校准发动机，并使两个或更多个发动机达到相同的期望状态。

公开(公告)号：US20070177231A1

公开(公告)日：2007-08-02

申请号：US11343656

申请日：2006-01-31

申请人： Shen-ge Wang ,  Raja Bala ,  Vishal Monga

发明人： Shen-ge Wang ,  Raja Bala ,  Vishal Monga

IPC分类号： H04N1/46

CPC分类号： H04N1/4078 ,  H04N1/40006

摘要： A method for compensating for color drift in a printer includes determining a first true tone response curve for a color channel when said printer is in a first state. A first estimated tone response curve for the color channel is also determined when said printer is in the first state. A second estimated tone response curve for the color channel is determined when the printer is in a second, color-drifted state relative to the first state. A second true tone response curve for the color channel is mathematically predicted using the first true tone response curve, the first estimated tone response curve, and the second estimated tone response curve. The first and second estimated tone response curves are estimated using a 2×2 printer model. A printing apparatus includes an image processing unit for implementing the color-drift correction process.

摘要翻译： 用于补偿打印机中的颜色漂移的方法包括当所述打印机处于第一状态时，确定用于颜色通道的第一真实色调响应曲线。 当所述打印机处于第一状态时，还确定色彩通道的第一估计色调响应曲线。 当打印机处于相对于第一状态的第二颜色漂移状态时，确定用于颜色通道的第二估计色调响应曲线。 使用第一真实色调响应曲线，第一估计色调响应曲线和第二估计色调响应曲线来数学地预测用于色彩通道的第二真正色调响应曲线。 使用2x2打印机模型来估计第一和第二估计音响应曲线。 打印装置包括用于实现色差校正处理的图像处理单元。

公开(公告)号：US20120133991A1

公开(公告)日：2012-05-31

申请号：US13300845

申请日：2011-11-21

申请人： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

发明人： Vishal Monga ,  Shen-Ge Wang ,  Raja Bala

IPC分类号： H04N1/405

CPC分类号： G06K15/02 ,  G06K15/027 ,  H04N1/52 ,  H04N1/6027 ,  H04N1/6033

摘要： A method and apparatus are provided for compensating for spatial non-uniformities in a printer by deriving a true spatial non-uniformity tone response curve (TRC) that characterizes the printer in terms of color output variation for each addressable pixel location in a spatial range. The “true average” tone response curve is determined for a color channel. A prediction of the true response as a function of the spatial location is derived by printing and scanning a specially designed halftone-independent target of binary patterns. The predicted tone response curve for each color channel and halftone is predicted using a binary printer model, wherein the “predicted tone response curve” provides a model based approximation of the actual response for each addressable pixel location in the spatial range. Also stored is an “average predicted tone response” by averaging the “predicted tone response curve” over the spatial range of the printer.

摘要翻译： 提供了一种方法和装置，用于通过根据空间范围内的每个可寻址像素位置的颜色输出变化导出表征打印机的真实空间不均匀色调响应曲线（TRC）来补偿打印机中的空间非均匀性。 针对颜色通道确定“真实平均”色调响应曲线。 作为空间位置的函数的真实响应的预测是通过打印和扫描专门设计的与二元模式无关的目标的二进制模式得出的。 使用二进制打印机模型预测每个颜色通道和半色调的预测色调响应曲线，其中“预测色调响应曲线”为空间范围内的每个可寻址像素位置提供基于模型的近似实际响应。 还通过在打印机的空间范围上对“预测色调响应曲线”进行平均，还存储“平均预测色调响应”。