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1. 发明授权

US07064860B1 Color-balanced TRC correction to compensate for illuminant changes in printer characterization 有权
标题翻译：彩色平衡TRC校正，以补偿打印机表征中的光源变化
公开(公告)号：US07064860B1
公开(公告)日：2006-06-20
申请号：US09571125
申请日：2000-05-15
申请人： Thyagarajan Balasubramanian , Shen-Ge Wang
发明人： Thyagarajan Balasubramanian , Shen-Ge Wang
IPC分类号： H04N1/40
CPC分类号： H04N1/40 , H04N1/6008 , H04N1/6027 , H04N1/6033 , H04N1/6088
摘要： A color marking device includes a color balance controller which adjusts the TRC linearization in accordance with an intended illuminant for viewing the output of the device. The system comprises a front end converter for converting an input signal representative of a target image comprised to preselect the color into a device dependent control system in accordance with the device TRC. The device TRC is selected in accordance with a signal identifying the intended illuminant for the output.
摘要翻译：颜色标记装置包括色平衡控制器，该色平衡控制器根据用于观察装置的输出的预期光源来调整TRC线性化。该系统包括前端转换器，用于根据设备TRC将表示包括预选颜色的目标图像的输入信号转换成依赖于设备的控制系统。根据识别输出的预期光源的信号来选择装置TRC。

2. 发明授权

US07307752B1 On-line calibration system for a dynamically varying color marking device 有权
标题翻译：用于动态变化的彩色打标设备的在线校准系统
公开(公告)号：US07307752B1
公开(公告)日：2007-12-11
申请号：US09566291
申请日：2000-05-05
申请人： Lingappa K. Mestha , Peter A. Crean , Martin S. Maltz , Robert J. Rolleston , Yao Rong Wang , Eric Jackson , Thyagarajan Balasubramanian
发明人： Lingappa K. Mestha , Peter A. Crean , Martin S. Maltz , Robert J. Rolleston , Yao Rong Wang , Eric Jackson , Thyagarajan Balasubramanian
IPC分类号： G06F15/00 , H04N1/46 , G03F3/08
CPC分类号： G06F15/00 , H04N1/4078 , H04N1/6027 , H04N1/6033
摘要： A color marking device including a control system for calibration of the device based upon dynamic color balance control of an output image. The system comprises a front end converter for converting an input signal representative of a target image comprising a preselected color into a device-dependent control signal in accordance with a device TRC, a color marking device for outputting an output image in response to the control signal, a sensor for measuring a parameter from the output image representative of a color of the output image, and, a point-wise controller for comparing the parameter with a corresponding parameter from the target image and constructing adjusted controlled points for the device TRC when the measured parameter and the corresponding parameter vary by a preselected value, a color balance controller for constructing an adjusted device TRC from the controlled points, whereby subsequently generated output images are output with the adjusted device TRC and, more accurately represent target input images.
摘要翻译：一种彩色标记装置，包括基于输出图像的动态色彩平衡控制来校准装置的控制系统。该系统包括：前端转换器，用于根据设备TRC将表示包括预选颜色的目标图像的输入信号转换成依赖于设备的控制信号;响应于控制信号输出输出图像的颜色标记装置，用于从表示输出图像的颜色的输出图像中测量参数的传感器，以及用于将参数与来自目标图像的相应参数进行比较的逐点控制器，并且当所述设备TRC的调整的控制点在测量参数和相应的参数由预选值变化，用于从受控点构建调整的设备TRC的色平衡控制器，由此随后生成的输出图像被调整的设备TRC输出，并且更精确地表示目标输入图像。

3. 发明授权

US06268939B1 Method and apparatus for correcting luminance and chrominance data in digital color images 失效
公开(公告)号：US06268939B1
公开(公告)日：2001-07-31
申请号：US09004650
申请日：1998-01-08
申请人： R. Victor Klassen , Thyagarajan Balasubramanian
发明人： R. Victor Klassen , Thyagarajan Balasubramanian
IPC分类号： G03F308
CPC分类号： H04N1/60 , H04N1/6058
摘要： The present invention is directed to a method and apparatus for improving the efficiency of color correcting subsampled luminance and chrominance based data. More specifically, the present invention is directed to a method of applying a full conversion between color spaces for one pixel in a selected pixel block. Chrominance values are assigned to the remaining pixels based upon their luminance values relative to the luminance value of the converted pixel. The invention may be used to convert between various types of color spaces, and may be used in the processing of both device dependent and device independent data.

4. 发明授权

US6009192A Color correction of a compressed image 失效
标题翻译：压缩图像的颜色校正
公开(公告)号：US6009192A
公开(公告)日：1999-12-28
申请号：US770765
申请日：1996-12-19
申请人： R. Victor Klassen , Steven J. Harrington , Thyagarajan Balasubramanian , Ricardo L. de Queiroz
发明人： R. Victor Klassen , Steven J. Harrington , Thyagarajan Balasubramanian , Ricardo L. de Queiroz
IPC分类号： H04N11/04 , H04N1/41 , H04N1/46 , H04N1/60 , H04N7/30 , G06K9/00 , G06K9/36 , G06K9/46
CPC分类号： H04N1/64 , H04N1/60
摘要： The present invention is a method for the color correction of digital images that have been compressed. In a preferred embodiment, aspects of the color correction are carried out on the compressed image data to improve computational efficiency. One of a number of alternative methods is employed to accomplish the color correction on lossy or losslessly compressed images. The color transformation process accomplishes color correction on compressed image data in conjunction with compression or decompression operations. A second, simplified phase of the color correction may be applied subsequently to the decompressed image data in certain embodiments. Accordingly, the technique has application to any number of color imaging systems, including digital printers and copiers where there is a necessity to color correct compressed digital images.
摘要翻译：本发明是一种已被压缩的数字图像的颜色校正方法。在优选实施例中，对压缩图像数据执行颜色校正的方面以提高计算效率。采用多种替代方法之一来实现有损或无损压缩图像上的色彩校正。彩色转换处理结合压缩或解压缩操作对压缩图像数据进行颜色校正。在某些实施例中，随后可以对解压缩的图像数据应用颜色校正的第二简化阶段。因此，该技术可应用于任何数量的彩色成像系统，包括需要对正确的压缩数字图像进行着色的数字打印机和复印机。

5. 发明授权

US5544284A Sequential product code quantization of digital color image 失效
标题翻译：数字彩色图像的顺序产品代码量化
公开(公告)号：US5544284A
公开(公告)日：1996-08-06
申请号：US833529
申请日：1992-02-11
申请人： Jan P. Allebach , Charles A. Bouman , Thyagarajan Balasubramanian
发明人： Jan P. Allebach , Charles A. Bouman , Thyagarajan Balasubramanian
IPC分类号： G09G5/06 , G06T1/00 , G06T5/00 , H04N1/64 , G06F15/00
CPC分类号： H04N1/644
摘要： A digital color image quantization mechanism employs sequential product code vector quantization, to sequentially extract chrominance and luminance values from the vectors and quantizes chrominance and luminance features based upon a conditional distribution of these features within partitioned regions of chrominance/luminance color space. The mechanism sequentially partitions a histogram of the original digital color image in luminance, chrominance (Y,Cb,Cr) space coordinates into a plurality of sub-regions or color space cells, such that each partitioned color cell is associated with a color of the output palette through which the color composition of a reproduced color image is defined. A splitting criterion determines the sequential order of partitioning of an axis. Because of the increased sensitivity of the human visual system to contouring artifacts in regions of an image to low spatial activity, the splitting criterion along the luminance axis is scaled or weighted in inverse proportion to the average spatial activity of the luminance-chrominance region subject to be split. A map of chrominance and luminance output codes is generated for the respective pixels of the output color image in accordance with the axial splitting or quantization of the chrominance and luminance components of the histogram.
摘要翻译：数字彩色图像量化机构采用顺序乘积码矢量量化，从色度和亮度色彩空间分割区域内的这些特征的条件分布，顺序地从矢量中提取色度和亮度值，并量化色度和亮度特征。该机构将亮度，色度（Y，Cb，Cr）空间坐标中的原始数字彩色图像的直方图依次分割成多个子区域或色彩空间单元，使得每个分割的彩色单元与输出调色板，通过该调色板定义再现的彩色图像的颜色组成。分割标准确定轴的分割顺序。由于人类视觉系统对图像区域中的伪像的敏感性增加到低空间活动，所以沿着亮度轴的分割准则被缩放或加权，与受到受限制的亮度色度区域的平均空间活动成反比分裂根据直方图的色度和亮度分量的轴向分割或量化，为输出彩色图像的各个像素生成色度和亮度输出代码的映射。

6. 发明授权

US06972867B1 Patch codes for color calibration job identification encoding 失效
标题翻译：彩色校准作业识别编码的补码
公开(公告)号：US06972867B1
公开(公告)日：2005-12-06
申请号：US09710106
申请日：2000-11-10
申请人： Dennis L. Venable , Thyagarajan Balasubramanian
发明人： Dennis L. Venable , Thyagarajan Balasubramanian
IPC分类号： B41J29/46 , B41J2/525 , G01J3/52 , H04N1/23 , H04N1/60 , G06K15/00 , H04N1/46
CPC分类号： H04N1/6033 , H04N2201/3269
摘要： A color calibration job identification system and method are provided, wherein the job identification data is encoded on a printed page, in a patch code, along with color targets, according to a protocol and format approximately identical to a format of the color targets. The patch code comprises a first portion, including a start code, and a second portion, including job identification data. The first portion of the patch code is comprised of two or more small color patches, each having a predefined color. The second portion of the patch code is comprised of two or more small color patches wherein each of the patches is comprised of a color selected from a plurality of colors, wherein each of the colors is indicative of a unique datum value, preferably an octal digit. The system provides a means for determining correct functioning of a printer and a means for determining an orientation of a printed page in a scanning device.
摘要翻译：提供了一种颜色校准作业识别系统和方法，其中根据与彩色目标的格式大致相同的协议和格式，将作业识别数据与打印页面，拼图代码以及颜色目标一起编码。补丁码包括包括起始码的第一部分和包括作业识别数据的第二部分。补丁代码的第一部分由两个或更多个小颜色补丁组成，每个都有一个预定义的颜色。补丁代码的第二部分由两个或更多个小的色块组成，其中每个补丁由选自多种颜色的颜色组成，其中每种颜色表示唯一的基准值，优选地是八进制数。该系统提供用于确定打印机的正确功能的装置和用于确定扫描装置中的打印页面的方位的装置。

7. 发明授权

US06819792B1 Automatic detection of colorimetry of unknown CMYK images 有权
标题翻译：自动检测未知CMYK图像的比色法
公开(公告)号：US06819792B1
公开(公告)日：2004-11-16
申请号：US09656623
申请日：2000-09-07
申请人： Thyagarajan Balasubramanian
发明人： Thyagarajan Balasubramanian
IPC分类号： G06K900
CPC分类号： G06K9/4652 , G06T7/90
摘要： A method for the automatic detection of colorimetry of CMYK image files includes the calculation of differentiation metrics based on colorant relationships, saturation, and luminance. Summary statistics, such as the means and standard deviations of the differentiation metrics are used to describe a set of known image colorimetry classes. At least one classifying algorithm is used to assign a known colorimetry class to an image of unknown colorimetry. Preferably at least one of the classifying algorithms is a Bayesian Quadratic Classifier algorithm. Mahanalobis distances are used to find the most appropriate colorimetry class to assign to an image. A color image processor operative to automatically detect image colorimetry comprises a training image analyzer, a colorimetry detector and a class associator.
摘要翻译：用于自动检测CMYK图像文件的比色法的方法包括基于着色剂关系，饱和度和亮度的差分度量的计算。汇总统计数据，例如差分度量的均值和标准偏差用于描述一组已知的图像比色法类别。使用至少一种分类算法将已知的比色法类分配给未知比色法的图像。优选地，分类算法中的至少一个是贝叶斯二次分类器算法。 Mahanalobis距离用于找到最适合的比例分类以分配给图像。用于自动检测图像比色法的彩色图像处理器包括训练图像分析仪，比色检测器和分类关联器。

8. 发明授权

US06414690B1 Gamut mapping using local area information 有权
标题翻译：使用本地区信息进行色域映射
公开(公告)号：US06414690B1
公开(公告)日：2002-07-02
申请号：US09457022
申请日：1999-12-08
申请人： Thyagarajan Balasubramanian , Karen M. Braun
发明人： Thyagarajan Balasubramanian , Karen M. Braun
IPC分类号： G06T1140
CPC分类号： H04N1/6058
摘要： A color printing process, printing a color image in which out-of-gamut original colors are present. Each pixel is reviewed in context of its neighbors prior to remapping, so that a remapping function may take local area information into account in the remapping process.
摘要翻译：彩色打印处理，打印出色域原色的彩色图像。每个像素在重新映射之前在其邻居的上下文中进行审查，使得重映射功能可以在重映射过程中考虑局部区域信息。

9. 发明授权

US06381037B1 Dynamic creation of color test patterns for improved color calibration 有权
标题翻译：动态创建颜色测试图案，以改进颜色校准
公开(公告)号：US06381037B1
公开(公告)日：2002-04-30
申请号：US09340884
申请日：1999-06-28
申请人： Thyagarajan Balasubramanian , Reiner Eschbach , Paul G. Roetling
发明人： Thyagarajan Balasubramanian , Reiner Eschbach , Paul G. Roetling
IPC分类号： G03F308
CPC分类号： H04N1/6033
摘要： A method for calibrating a printer includes printing a first set of color samples with the printer, reflecting at least a portion of the printer gamut. Each printed color sample in the set of samples is measured calorimetrically, to determine the printer's response thereto. The colorimetric response is compared with a predictive model of printer behavior for that portion of the printer gamut. In a portion of the printer gamut wherein the calorimetric response differs from predicted printer behavior, the printer generates a new set of color samples, for printing. The new set of color samples is secondarily measured to determine the printer's colorimetric response thereto; and using the initial measurements and the secondary measurements, a color calibration table is generated for use by the printer in converting device independent colors to device dependent colors.
摘要翻译：用于校准打印机的方法包括用打印机打印第一组颜色样本，反映打印机色域的至少一部分。测量样品组中的每个印刷色样都是用量热测量的，以确定打印机对其的响应。将比色响应与打印机色域部分的打印机行为的预测模型进行比较。在打印机色域的其中热量响应与预测的打印机行为不同的部分中，打印机生成新的一组颜色样本用于打印。二次测量新的一组颜色样品以确定打印机的比色响应; 并且使用初始测量和二次测量，生成颜色校准表以供打印机将设备独立颜色转换为与设备相关的颜色。

10. 发明授权

US07436549B2 Patch codes for color calibration job identification encoding 有权
标题翻译：彩色校准作业识别编码的补码
公开(公告)号：US07436549B2
公开(公告)日：2008-10-14
申请号：US11247552
申请日：2005-10-11
申请人： Dennis L. Venable , Thyagarajan Balasubramanian
发明人： Dennis L. Venable , Thyagarajan Balasubramanian
IPC分类号： H04N1/46
CPC分类号： H04N1/6033 , H04N2201/3269
摘要： A color calibration job identification system and method are provided, wherein the job identification data is encoded on a printed page, in a patch code, along with color targets, according to a protocol and format approximately identical to a format of the color targets. The patch code comprises a first portion, including a start code, and a second portion, including job identification data. The first portion of the patch code is comprised of two or more small color patches, each having a predefined color. The second portion of the patch code is comprised of two or more small color patches wherein each of the patches is comprised of a color selected from a plurality of colors, wherein each of the colors is indicative of a unique datum value, preferably an octal digit. The system provides a means for determining correct functioning of a printer and a means for determining an orientation of a printed page in a scanning device.
摘要翻译：提供了一种颜色校准作业识别系统和方法，其中根据与彩色目标的格式大致相同的协议和格式，将作业识别数据与打印页面，拼图代码以及颜色目标一起编码。补丁码包括包括起始码的第一部分和包括作业识别数据的第二部分。补丁代码的第一部分由两个或更多个小颜色补丁组成，每个都有一个预定义的颜色。补丁代码的第二部分由两个或更多个小的色块组成，其中每个补丁由选自多种颜色的颜色组成，其中每种颜色表示唯一的基准值，优选地是八进制数。该系统提供用于确定打印机的正确功能的装置和用于确定扫描装置中的打印页面的方位的装置。

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