公开(公告)号：US06958828B2

公开(公告)日：2005-10-25

申请号：US10280311

申请日：2002-10-24

申请人： Keith T. Knox ,  Zhigang Fan ,  Eric J. Schneider

发明人： Keith T. Knox ,  Zhigang Fan ,  Eric J. Schneider

IPC分类号： B42D15/10 ,  G03F3/08 ,  G03G21/04 ,  G07D7/00 ,  G07D7/20 ,  H04N1/32 ,  H04N1/387 ,  H04N1/46 ,  G06F15/00 ,  G06F9/00

CPC分类号： G07D7/20 ,  G07D7/004 ,  H04N1/32208 ,  H04N1/32251 ,  H04N1/32309 ,  H04N1/32352 ,  H04N2201/3205 ,  H04N2201/3271 ,  H04N2201/3273

摘要： A method and apparatus are described for detecting photocopier tracking signatures placed on documents produced by color photocopiers. The apparatus includes an input terminal that supplies digital image data representing an input document produced by a color photocopier. The digital image data includes a plurality of pixel values grouped together to form a plurality of color separations that represent the input document. The apparatus also includes an image processing unit that generates an output image based on the digital image data. The image processing unit generates the output image based on differences between corresponding pixel values of at least two of the plurality of color separations. The apparatus further includes an ouput terminal for displaying the output image to view the photocopier tracking signature. Color differences can be detected by combining two or more of the color separations into a resulting monochromatic image and then enhancing the resulting color differences. The combination of the separations exposes small color differences that are not detectable in any of the individual separations, thus enabling the photocopier signature to be detected.

摘要翻译： 描述了一种用于检测放置在由彩色复印机产生的文档上的复印机跟踪签名的方法和装置。 该装置包括：输入端，其提供表示由彩色复印机产生的输入文档的数字图像数据。 数字图像数据包括分组在一起以形成表示输入文档的多个分色的多个像素值。 该装置还包括基于数字图像数据生成输出图像的图像处理单元。 图像处理单元基于多个分色中的至少两个的相应像素值之间的差异来生成输出图像。 该装置还包括用于显示输出图像以观看复印机跟踪签名的输出端子。 可以通过将两个或更多个分色合并成所得到的单色图像，然后增强所得到的颜色差异来检测色差。 分离的组合暴露出在任何单独分离中不可检测到的小的色差，从而能够检测复印机签名。

公开(公告)号：US06515764B1

公开(公告)日：2003-02-04

申请号：US09216236

申请日：1998-12-18

申请人： Keith T. Knox ,  Zhigang Fan ,  Erie J. Schneider

发明人： Keith T. Knox ,  Zhigang Fan ,  Erie J. Schneider

IPC分类号： G06F1500

CPC分类号： G07D7/20 ,  G07D7/004 ,  H04N1/32208 ,  H04N1/32251 ,  H04N1/32309 ,  H04N1/32352 ,  H04N2201/3205 ,  H04N2201/3271 ,  H04N2201/3273

摘要： A method and apparatus are described for detecting photocopier tracking signatures placed on documents produced by color photocopiers. The apparatus includes an input terminal that supplies digital image data representing an input document produced by a color photocopier. The digital image data includes a plurality of pixel values grouped together to form a plurality of color separations that represent the input document. The apparatus also includes an image processing unit that generates an output image based on the digital image data. The image processing unit generates the output image based on differences between corresponding pixel values of at least two of the plurality of color separations. The apparatus further includes an output terminal for displaying the output image to view the photocopier tracking signature. Color differences can be detected by combining two or more of the color separations into a resulting monochromatic image and then enhancing the resulting color differences. The combination of the separations exposes small color differences that are not detectable in any of the individual separations, thus enabling the photocopier signature to be detected.

摘要翻译： 描述了一种用于检测放置在由彩色复印机产生的文档上的复印机跟踪签名的方法和装置。 该装置包括：输入端，其提供表示由彩色复印机产生的输入文档的数字图像数据。 数字图像数据包括分组在一起以形成表示输入文档的多个分色的多个像素值。 该装置还包括基于数字图像数据生成输出图像的图像处理单元。 图像处理单元基于多个分色中的至少两个的相应像素值之间的差异来生成输出图像。 该装置还包括用于显示输出图像以查看复印机跟踪签名的输出端子。 可以通过将两个或更多个分色合并成所得到的单色图像，然后增强所得到的颜色差异来检测色差。 分离的组合暴露出在任何单独分离中不可检测到的小的色差，从而能够检测复印机签名。

公开(公告)号：US5832137A

公开(公告)日：1998-11-03

申请号：US848330

申请日：1997-05-01

申请人： Keith T. Knox

发明人： Keith T. Knox

IPC分类号： H04N1/19 ,  H04N1/38 ,  H04N1/407 ,  H04N1/409 ,  G06K15/02 ,  H04N1/23

CPC分类号： H04N1/4095

摘要： An image processing method for mitigating the effects of show-through in scanning a duplexed document in a duplex scanning system, including: deriving a scanned first side image P from a first side image A of a duplexed document and a scanned second side image Q from a second side image B of the duplexed document, at least the first side image P including a component thereof attributable to show-through from the second side of the document, and storing images P and Q; from second side image Q, generating a representation thereof corresponding to the show-through contribution to first side image P; processing image P to remove show-through as a function of the representation Q, thereby deriving correct image A.

摘要翻译： 一种图像处理方法，用于减轻在双面扫描系统中扫描双面文档时的显示效果，包括：从双面文档的第一侧面图像A和扫描的第二侧面图像Q导出扫描的第一侧图像P， 双面文件的第二侧面图像B，至少包括其从原稿的第二面呈现的分量的第一侧面图像P，并且存储图像P和Q; 从第二侧图像Q生成与对第一侧图像P的显示贡献相对应的表示; 处理图像P以作为表示Q的函数去除显示，从而导出正确的图像A.

公开(公告)号：US5317653A

公开(公告)日：1994-05-31

申请号：US65088

申请日：1993-05-20

申请人： Reiner Eschbach ,  Keith T. Knox ,  David Birnbaum

发明人： Reiner Eschbach ,  Keith T. Knox ,  David Birnbaum

IPC分类号： G06T5/00 ,  H04N1/40 ,  H04N1/405 ,  G06K1/38

CPC分类号： H04N1/4052

摘要： A method and arrangement for the application of under compensated error diffusion to a pixel quantizing method in the conversion of image data from a number of input levels that is relatively large with respect to a number of desired output levels.

摘要翻译： 一种用于将图像数据从相对于期望输出电平数量相对较大的输入电平的数字转换中应用于补偿误差扩散到像素量化方法的方法和装置。

公开(公告)号：US06961157B2

公开(公告)日：2005-11-01

申请号：US09867323

申请日：2001-05-29

申请人： Jagdish C. Tandon ,  Keith T. Knox ,  Robert R. Buckley

发明人： Jagdish C. Tandon ,  Keith T. Knox ,  Robert R. Buckley

IPC分类号： H04N1/028 ,  H04N1/48 ,  H04N9/07 ,  H04N1/46 ,  H01L27/00 ,  H04N1/04 ,  H04N9/64 ,  H04N9/83

CPC分类号： H04N1/486

摘要： In an imaging apparatus such as a scanner or digital camera, a photosensitive device includes multiple linear arrays of photosensors. One of the arrays has a higher spatial resolution than other arrays. The high-resolution array is filtered to detect different portions of the color spectrum than the low-resolution arrays.

摘要翻译： 在诸如扫描仪或数码相机的成像设备中，感光装置包括多个光电传感器的线性阵列。 其中一个阵列具有比其他阵列更高的空间分辨率。 过滤高分辨率阵列以检测色谱的不同部分，而不是低分辨率阵列。

公开(公告)号：US06526155B1

公开(公告)日：2003-02-25

申请号：US09449356

申请日：1999-11-24

申请人： Shen-ge Wang ,  Keith T. Knox

发明人： Shen-ge Wang ,  Keith T. Knox

IPC分类号： G06K900

CPC分类号： G06T1/005 ,  G06T2201/0051

摘要： Visible digital watermarks enable a robust tracking method to be associated with one or more input images. Specifically, by modifying a halftone screen within a certain area by setting a gray-scale range within that area to a threshold, and halftoning an input image based on this modified halftone screen, visible watermarks can be embedded into an input image.

摘要翻译： 可视数字水印使得鲁棒跟踪方法能够与一个或多个输入图像相关联。 具体地说，通过将该区域内的灰阶范围设定为阈值来修改某一区域内的半色调画面，并根据该修改后的半色调画面对输入图像进行半色调处理，将可视水印嵌入到输入图像中。

公开(公告)号：US5668638A

公开(公告)日：1997-09-16

申请号：US671479

申请日：1996-06-27

申请人： Keith T. Knox

发明人： Keith T. Knox

IPC分类号： B41J2/485 ,  G06T5/00 ,  H04N1/40 ,  H04N1/405 ,  H04N1/407

CPC分类号： H04N1/4053

摘要： A processing system for processing electronic images defined in terms of image signals, each image signal representing density at a discrete position within the electronic image, and quantizing image signals defined at "c" gray levels for use in a device requiring image signals defined at "d" levels, where "d" may be less than or equal to "c", the system including an image input receiving at least a portion of the electronic image as input signals; an error adding circuit, adding error signals determined from any previous thresholding processing to the input signals to generate corrected input signals; a thresholding processor, receiving corrected image signals defined at "c" levels, and quantizing the corrected image signals to "d" levels, by comparison to at least one threshold signal and outputting the corrected image signals at "d" levels as output signals; an image output, outputting output signals defined at "d" levels; a differencing circuit, generating a difference signal representative of the difference in image density between corresponding corrected input signals and the output signal; an error distribution circuit, receiving the difference signals, and directing weighted portions thereof to the error adding circuit for addition to subsequent image signals in a predetermined spatial relationship to the input signals; and a threshold modulation circuit, varying the threshold signals proportionally to the input image, and recursively varying the threshold signals in response to previous threshold signals.

摘要翻译： 一种用于处理根据图像信号定义的电子图像的处理系统，每个图像信号表示电子图像内的离散位置处的密度，以及量化在“c”灰度级定义的图像信号，用于需要在“ d“电平，其中”d“可以小于或等于”c“，该系统包括接收电子图像的至少一部分作为输入信号的图像输入; 误差加法电路，将从任何先前的阈值处理确定的误差信号加到输入信号上以产生经校正的输入信号; 阈值处理器，接收以“c”电平定义的校正图像信号，并且通过与至少一个阈值信号相比较将校正后的图像信号量化为“d”电平，并以“d”电平输出校正后的图像信号作为输出信号; 图像输出，输出以“d”电平定义的输出信号; 差分电路，产生表示对应的校正输入信号与输出信号之间的图像浓度差的差分信号; 误差分配电路，接收差分信号，并将其加权部分引导到误差加法电路，以便以与预定的空间关系与输入信号相加的后续图像信号; 以及阈值调制电路，与输入图像成比例地改变阈值信号，并响应于先前的阈值信号递归地改变阈值信号。

公开(公告)号：US07145697B1

公开(公告)日：2006-12-05

申请号：US09671393

申请日：2000-09-27

申请人： Gaurav Sharma ,  Keith T. Knox

发明人： Gaurav Sharma ,  Keith T. Knox

IPC分类号： G06K15/00 ,  G06T5/00 ,  H04N1/407 ,  H04N1/409

CPC分类号： H04N1/4095 ,  H04N1/6097

摘要： Apparatus and methods that adjust image data for show-through image information of an image on a front side of an image bearing substrate having image data on a back side and on an adjacent side of a backing substrate, e.g., the pages of a bound volume. Image data for a front side image, a back side image and an adjacent side image is obtained from an optical sensor that senses light reflected from the image bearing substrate. The image data is stored in a memory and is used to determine scanned density data and approximate absorbency data for the respective sides of the substrates. Show-through compensated density data for the front side image is computed by filtering the absorbency data for the back and adjacent side with a filter characteristic of the show-through characteristics of the image bearing substrate and subtracting this filtered absorbency data from the front side scanned density data. If required, the show-through compensated density data for the front, side image is converted into a show-through compensated reflectance image.

摘要翻译： 调整图像数据的装置和方法，用于在背衬基板的背侧和相邻侧上的具有图像数据的图像承载基板的正面上的图像的显示图像信息，例如粘合体积的页面 。 从感测从图像承载基板反射的光的光学传感器获得正面图像，背面图像和相邻侧面图像的图像数据。 图像数据被存储在存储器中，并且用于确定基板的各个侧面的扫描密度数据和近似吸收性数据。 通过用图像承载衬底的显示特性的滤波器特性过滤背部和相邻侧的吸收性数据来计算正面图像的直通补偿密度数据，并从扫描的正面侧减去该滤波的吸光度数据 密度数据。 如果需要，前侧图像的显示补偿密度数据被转换成透视补偿反射图像。

公开(公告)号：US06628843B1

公开(公告)日：2003-09-30

申请号：US09448947

申请日：1999-11-24

申请人： Reiner Eschbach ,  Keith T. Knox

发明人： Reiner Eschbach ,  Keith T. Knox

IPC分类号： G06K940

CPC分类号： G06T5/007 ,  G06T5/003 ,  G06T9/007

摘要： A method and apparatus are provided for enhancing JPEG compressed digital image data wherein only the DC components of the compressed image data are required to obtain a statistical subsampling of the corresponding uncompressed image data. JPEG compressed image data are received that represent an input digital image, and the JPEG compressed image data include a plurality of DC components. DC components are extracted from the JPEG compressed image data, and the extracted plurality of said DC components represent a subsampling of the input digital image. At least some of the plurality of extracted DC components are input to an automated image enhancement system. The DC components input to the automated image enhancement system are used to derive at least one of a final correction tone reproduction curve and a sharpness filter for enhancement of the input digital image represented by the JPEG compressed data. The final correction tone reproduction curve and/or sharpness filter are bound to the JPEG compressed image data for subsequent use in enhancing the input digital image represented by the JPEG compressed image data after the JPEG compressed image data have been decompressed.

摘要翻译： 提供了一种用于增强JPEG压缩数字图像数据的方法和装置，其中仅需要压缩图像数据的DC分量来获得对应的未压缩图像数据的统计二次采样。 接收表示输入数字图像的JPEG压缩图像数据，JPEG压缩图像数据包括多个DC分量。 从JPEG压缩图像数据中提取DC分量，并且提取的多个所述DC分量表示输入数字图像的子采样。 多个提取的DC分量中的至少一些被输入到自动图像增强系统。 输入到自动图像增强系统的DC分量被用于导出用于增强由JPEG压缩数据表示的输入数字图像的最终校正色调再现曲线和锐度滤波器中的至少一个。 最终校正色调再现曲线和/或锐度滤波器被绑定到JPEG压缩图像数据，用于随后在JPEG压缩图像数据被解压缩之后增强由JPEG压缩图像数据表示的输入数字图像。

公开(公告)号：US5790281A

公开(公告)日：1998-08-04

申请号：US720653

申请日：1996-10-02

申请人： Keith T. Knox ,  Brian L. Waldron

发明人： Keith T. Knox ,  Brian L. Waldron

IPC分类号： H04N1/60 ,  G06T1/00 ,  G06T5/00 ,  H04N1/40 ,  H04N1/407 ,  H04N1/46

CPC分类号： H04N1/4076

摘要： This invention discloses a method of correcting the measurement of the amount of light reflected by a document that is being processed by a digital image acquisition apparatus. A typical image acquisition apparatus measures the amount of light reflected from the surface of the original document and sets a corresponding set of electrical signals to a printing or storage module. Image acquisition usually requires illuminating the original document with a reflecting cavity, which causes the measurement of the amount of light present on the surface of the document to become distorted. The method disclosed by the present invention corrects this phenomenon by calculating the amount of light that reaches the surface of the original document by being reflected from the illumination system and the surrounding cavity. This allows the measured reflectance to be corrected, and the true reflectance to be used for subsequent output or storage.

摘要翻译： 本发明公开了一种校正由数字图像采集装置正在处理的文件反射的光量的测量的方法。 典型的图像采集装置测量从原始文件的表面反射的光量，并将相应的一组电信号设置到打印或存储模块。 图像采集通常需要用反射腔照射原稿，这样可以测量文件表面上存在的光量变形。 本发明公开的方法通过计算通过从照明系统和周围空腔反射到达原稿的表面的光量来校正这种现象。 这允许校正测量的反射率，并且将真实的反射率用于随后的输出或存储。