公开(公告)号：US07652808B2

公开(公告)日：2010-01-26

申请号：US10733608

申请日：2003-12-11

申请人： Raja Bala

发明人： Raja Bala

IPC分类号： G03F3/00 ,  G06K1/00 ,  G06K9/00 ,  G06K9/36

CPC分类号： H04N1/6027 ,  H04N1/6072

摘要： A system and method for gamut mapping includes a luminance compression algorithm for gamut mapping that varies across different parts of the image. In shadow regions, a soft compression function is applied to bring out the detail. In other regions, including areas with high local contrast, a hard clipping function is applied to preserve local contrast. The algorithm adaptively blends between these two functions to ensure that the overall compression function is spatially smooth. The system and method may also use chrominance information to compute “perceived lightness”, to be used as input to the low-pass filter. Also, the blending function α( ) could be a function of chrominance as well as luminance.

摘要翻译： 用于色域映射的系统和方法包括在图像的不同部分上变化的色域映射的亮度压缩算法。 在阴影区域，应用软压缩功能来显示细节。 在其他区域，包括局部对比度较高的区域，应用硬切割功能来保持局部对比度。 该算法自适应地融合了这两个功能，以确保整体压缩功能在空间上平滑。 该系统和方法还可以使用色度信息来计算“感知亮度”，以用作低通滤波器的输入。 此外，混合函数alpha（）可以是色度以及亮度的函数。

公开(公告)号：US07639401B2

公开(公告)日：2009-12-29

申请号：US11012994

申请日：2004-12-15

申请人： Raja Bala ,  Karen M. Braun ,  Robert J. Rolleston

发明人： Raja Bala ,  Karen M. Braun ,  Robert J. Rolleston

IPC分类号： H04N1/46 ,  G06K9/00

CPC分类号： H04N1/6033 ,  H04N9/3194

摘要： Provided herein are teachings directed to overcoming the problem of erroneous color reproduction on a color output device such as a color display. The teachings herein provide a method for correcting color image data input to a display device by displaying a target of color patches of known input values on the display device, and capturing an image of the target with a digital camera. This is followed by extracting camera signals from the image which corresponds to the color patches, and deriving a tone response calibration for the projector from the camera signals and the input values.

摘要翻译： 这里提供的是旨在克服彩色显示器等彩色输出装置上的错误色彩再现问题的教导。 本文的教导提供了一种通过在显示装置上显示已知输入值的色标目标并用数字照相机捕获目标图像来校正输入到显示装置的彩色图​​像数据的方法。 然后从相应于色块的图像中提取相机信号，并根据相机信号和输入值导出投影机的色调响应校准。

公开(公告)号：US07639260B2

公开(公告)日：2009-12-29

申请号：US11012993

申请日：2004-12-15

申请人： Raja Bala ,  Karen M. Braun ,  Robert J. Rolleston

发明人： Raja Bala ,  Karen M. Braun ,  Robert J. Rolleston

IPC分类号： G03F3/08 ,  G09G5/00 ,  G09G5/06 ,  G06K9/00 ,  G06K9/40 ,  G06T1/00 ,  H04N1/46 ,  H04N1/60

CPC分类号： H04N1/6033 ,  H04N9/3194 ,  H04N9/69 ,  H04N17/02 ,  H04N17/04

摘要： Provided herein are teachings directed to overcoming the problem of erroneous color reproduction on a color output device such as a color display. The teachings herein provide a system and apparatus for correcting color image data input to a display device by displaying a target of color patches of known input values on the display device, and capturing an image of the target with a digital camera. This is followed by extracting camera signals from the image which correspond to the color patches, and deriving a tone response calibration for the projector from the camera signals and the input values.

摘要翻译： 这里提供的是旨在克服彩色显示器等彩色输出装置上的错误色彩再现问题的教导。 本文的教导提供了一种系统和装置，用于通过在显示装置上显示已知输入值的色块的目标，并用数字照相机捕获目标的图像来校正输入到显示装置的彩色图​​像数据。 然后从相应于色块的图像中提取相机信号，并根据相机信号和输入值导出投影机的色调响应校准。

公开(公告)号：US20090237682A1

公开(公告)日：2009-09-24

申请号：US12052909

申请日：2008-03-21

申请人： Raja Bala ,  Yonghui Zhao

发明人： Raja Bala ,  Yonghui Zhao

IPC分类号： G06F3/12

CPC分类号： H04N1/6033

摘要： The appearance of a color print viewed under UV illumination is predicted using a target comprising color patches each printed using a known coverage of printer colorant(s). In one case, the target is illuminated using a UV light source and an electronic image of the target is captured using a digital camera or the like. In another case, a spectrophotometer is used both with and without a UV cutoff filter to measure the target. The captured image data or the spectrophotometric measurements are used to derive a UV printer characterization model that relates any arbitrary combination of printer colorants to a predicted UV color appearance value. Metameric colorant mixture pairs for visible light and UV light viewing can be determined using the UV model together with a conventional visible light printer characterization model. A visual matching task is used to determine a correction factor for the UV printer characterization model.

摘要翻译： 在UV照射下观察的彩色印刷品的外观使用包括使用已知的打印机着色剂覆盖印刷的各种色块的目标进行预测。 在一种情况下，使用UV光源照射目标，并且使用数字照相机等捕获目标的电子图像。 在另一种情况下，使用分光光度计来测量目标。 捕获的图像数据或分光光度测量用于得出将打印机着色剂的任意任意组合与预测的UV颜色外观值相关联的UV打印机表征模型。 可以使用UV模型和传统的可见光打印机表征模型来确定用于可见光和UV光观察的Metameric着色剂混合物对。 使用视觉匹配任务来确定UV打印机表征模型的校正因子。

公开(公告)号：US20090195796A1

公开(公告)日：2009-08-06

申请号：US12024208

申请日：2008-02-01

申请人： VISHAL MONGA ,  Raja Bala

发明人： VISHAL MONGA ,  Raja Bala

IPC分类号： G06F15/00

CPC分类号： G06K9/00442

摘要： What is provided herein is a method for automatically selecting a subset of pages from a multi-page document for image processing wherein each selected page is substantially different from all other pages according to certain features of interest and wherein the combined content of the selected pages approximately represents the content in the entire document. Selected pages are clustered wherein each page is represented by a feature vector meaningfully related to the task to be performed. A matrix of feature vectors is analyzed. Basis vectors are extracted from the matrix using rank-reduction techniques. Clustering is performed by subspace projection of page features onto the basis vectors with each page being assigned to a cluster to which that page maximally projects. Representative pages are selected from each cluster. The representative pages can then be used as input to a secondary process.

摘要翻译： 这里提供的是用于从用于图像处理的多页文档中自动选择页面子集的方法，其中根据感兴趣的某些特征，每个所选择的页面与所有其他页面基本不同，并且其中所选择的页面的组合内容大约 表示整个文档中的内容。 所选页面被聚集，其中每个页面由与要执行的任务有意义相关的特征向量表示。 分析特征向量矩阵。 使用秩降低技术从矩阵中提取基础向量。 通过将页面特征的子空间投影到基本向量上执行聚类，每个页面被分配给该页面最大程度投射到的群集。 从每个群集中选择代表页面。 然后可以将代表性页面用作次要过程的输入。

公开(公告)号：US07486416B2

公开(公告)日：2009-02-03

申请号：US11143818

申请日：2005-06-02

申请人： Edul N. Dalal ,  Wencheng Wu ,  Robert P. Loce ,  Raja Bala ,  Yeqing Zhang ,  Norman W. Zeck

发明人： Edul N. Dalal ,  Wencheng Wu ,  Robert P. Loce ,  Raja Bala ,  Yeqing Zhang ,  Norman W. Zeck

IPC分类号： H04N1/60 ,  H04N1/04 ,  G03F3/08 ,  G06K15/00 ,  G06K9/00

CPC分类号： H04N1/6038 ,  H04N1/6041

摘要： Spatially dependent colorant interaction effects are identified and isolated from other aspects of spatially dependent colorant appearance nonuniformities. A decorrelating function for compensating for the identified spatially dependent colorant interaction effects is determined. Spatially dependent single colorant compensating functions for compensating for the other aspects of the spatially dependent colorant appearance nonuniformities may also be determined. Image data is processed through the decorrelating function, thereby generating colorant values that are compensated for spatially dependent colorant interaction effects. Optionally, image data is also processed through the spatially dependent single colorant compensating functions, thereby generating colorant values that are compensated for both aspects of colorant appearance nonuniformities. The two kinds of compensating functions may be determined, calibrated and/or stored at different spatial and temporal frequencies or resolutions. One or both of the compensating functions may be employed to maintain consistency across a plurality of rendering devices (e.g., marking engines).

摘要翻译： 从空间依赖的着色剂外观不均匀性的其他方面鉴定和分离空间依赖性着色剂相互作用效应。 确定用于补偿所识别的空间依赖着色剂相互作用效应的去相关函数。 还可以确定用于补偿空间依赖着色剂外观不均匀性的其它方面的空间依赖性单色剂补偿功能。 图像数据通过去相关功能进行处理，从而产生对空间依赖的着色剂相互作用效应进行补偿的着色剂值。 可选地，还通过空间依赖的单一着色剂补偿功能来处理图像数据，由此产生着色剂值，其对着色剂外观不均匀性的两个方面进行补偿。 可以在不同的空间和时间频率或分辨率下确定，校准和/或存储两种补偿功能。 可以采用一种或两种补偿功能来保持多个渲染设备（例如，标记引擎）之间的一致性。

公开(公告)号：US20080299333A1

公开(公告)日：2008-12-04

申请号：US11754702

申请日：2007-05-29

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

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

IPC分类号： B44F1/00

CPC分类号： B42D25/387 ,  B41M3/144 ,  B42D25/00 ,  B42D25/29 ,  B42D25/333 ,  Y10T428/24802

摘要： The teachings as provided herein relate to a watermark embedded in an image that has the property of being relatively indecipherable under normal light, and yet decipherable under UV light. This fluorescent mark comprises a substrate containing optical brightening agents, and a first dot design printed as an image upon the substrate. The first dot design has as a characteristic the property of strongly suppressing substrate fluorescence. A second dot design having a property of providing a differing level of substrate fluorescence suppression from that of the first dot design such that when rendered in close spatial proximity with the first dot design image print, the resultant image rendered substrate suitably exposed to an ultra-violet light source, will yield a discernable image evident as a fluorescent mark.

摘要翻译： 本文提供的教导涉及嵌入在图像中的水印，其具有在正常光线下相对不可解译的性质，并且在UV光下可解码。 该荧光标记包括含有荧光增白剂的基材和在基材上作为图像印刷的第一点设计。 第一个点设计具有强烈抑制底物荧光的特性。 具有提供与第一点设计不同程度的底物荧光抑制的性质的第二点设计，使得当与第一点设计图像打印紧密地空间接近时，所得到的图像渲染衬底适当地暴露于超 紫色光源，将产生明显的可辨别图像作为荧光标记。

公开(公告)号：US20070264476A1

公开(公告)日：2007-11-15

申请号：US11382897

申请日：2006-05-11

申请人： Raja Bala ,  Reiner Eschbach

发明人： Raja Bala ,  Reiner Eschbach

IPC分类号： B41M5/00

CPC分类号： B41M3/144 ,  Y10T428/24802

摘要： The teachings as provided herein relate to a watermark embedded in an image that has the property of being relatively indecipherable under normal light, and yet decipherable under UV light. This fluorescent mark comprises a substrate containing optical brightening agents, and a first colorant mixture printed as an image upon the substrate. The colorant mixture layer has as characteristics a property of strongly suppressing substrate fluorescence, as well as a property of low contrast under normal illumination against the substrate or a second colorant mixture printed in close spatial proximity to the first colorant mixture, such that the resultant image rendered substrate suitably exposed to an ultra-violet light source, will yield a discernable image evident as a fluorescent mark.

摘要翻译： 本文提供的教导涉及嵌入在图像中的水印，其具有在正常光线下相对不可解译的性质，并且在UV光下可解码。 该荧光标记包括含有荧光增白剂的基材和作为图像印刷在基材上的第一着色剂混合物。 着色剂混合物层具有强烈抑制底物荧光的特性，以及在正常照射下对基材或低密度空间接近第一着色剂混合物印刷的第二着色剂混合物的低对比度的性质，使得所得图像 适当地暴露于紫外光源的被渲染基板将产生作为荧光标记显而易见的可辨别图像。

公开(公告)号：US07215817B2

公开(公告)日：2007-05-08

申请号：US10644342

申请日：2003-08-20

申请人： Ricardo L. de Queiroz ,  Robert P. Loce ,  Karen M. Braun ,  Raja Bala

发明人： Ricardo L. de Queiroz ,  Robert P. Loce ,  Karen M. Braun ,  Raja Bala

IPC分类号： G06K9/36 ,  G06K9/00

CPC分类号： G06K9/36 ,  H04N1/32309 ,  H04N1/32352

摘要： What is disclosed is a decoding method for retrieving information bits encoded in a printed image comprising the steps of first receiving an input electronic image as a scanned version of the printed image. A region of interest in the image is then extracted and, for that region, an amount of K colorant present, denoted KH; is obtained. Further, a color value is generated therefrom and the GCR used for encoding that region is determined using KH and the obtained color value. Encoded information bits are retrieved therefrom based on the determined GCR. The estimated KH is preferably evaluated conditional to a capacity signal KL and a luminance signal L. From the obtained data, values of KH, KL, and L, are derived wherein KH is estimated from a high resolution scan, and KL and L are estimated from a down-scaled image, respectively. The capacity signal KL and the luminance signal L are derived from the obtained color value. Further, the capacity signal, KL is derived by first applying a suitable operator S to reduce the image from scanner resolution to the watermark resolution and then converting the obtained color values to CMY estimates such that KL=min(C,M,Y) Alternatively, K-capacity is derived from the amount, KL, y, comprises first converting the obtained color values to CMY estimates and applying a suitable operator S to reduce the image from scanner resolution to the watermark resolution such that KL=min(S(C),S(M),S(Y)); wherein L is described by a linear combination of scan signals RGB, such that L=k1S(R)+k2S(G)+k3S(B). The value of KH is determined by first converting the obtained color values to CMY estimates. The estimates determine K-colorant amount at each pixel such that: K=min(C,M,Y). A suitable operator S is applied to reduce the image from scanner resolution to the watermark resolution.

公开(公告)号：US20070053003A1

公开(公告)日：2007-03-08

申请号：US11218966

申请日：2005-09-02

申请人： Robert Loce ,  Beilei Xu ,  Raja Bala

发明人： Robert Loce ,  Beilei Xu ,  Raja Bala

IPC分类号： H04N1/405

CPC分类号： H04N1/60 ,  H04N1/40075

摘要： Aspects of color of a halftoned image are controlled or adjusted. A method for adjustment can include determining a color description of a color of an area or window associated with a target halftoned pixel, determining a desired adjustment to the color associated with the target pixel, determining a color change value based on the desired adjustment and the color description associated with the target pixel, combining the color change value with at least one value of the target halftoned pixel, thereby generating at least one combined target pixel value and quantizing the at least one combined target pixel value. For instance error diffusion and/or rank-ordered error diffusion is used to perform the quantization. Color adjustments can be based on user preference and/or calibration compensations between original and target devices.

摘要翻译： 控制或调整半色调图像的颜色方面。 一种用于调整的方法可以包括确定与目标半色调像素相关联的区域或窗口的颜色的颜色描述，确定与目标像素相关联的颜色的期望调整，基于期望的调整确定颜色变化值，以及 与目标像素相关联的颜色描述，将颜色变化值与目标半色调像素的至少一个值组合，从而生成至少一个组合目标像素值并量化至少一个组合目标像素值。 例如，误差扩散和/或等级有序误差扩散用于执行量化。 颜色调整可以基于原始设备和目标设备之间的用户偏好和/或校准补偿。