公开(公告)号：US07136189B2

公开(公告)日：2006-11-14

申请号：US10040546

申请日：2002-01-07

申请人： Gaurav Sharma ,  Helen H. Shin ,  Shen-Ge Wang ,  Zhigang Fan

发明人： Gaurav Sharma ,  Helen H. Shin ,  Shen-Ge Wang ,  Zhigang Fan

IPC分类号： G06F15/00

CPC分类号： H04N1/52

摘要： A method is provided for rendering a color image with a plurality of separations with a multi-level successive-filling halftoning process using a single screen for a plurality of separations. For a separation to be processed, first, from the possible multiple levels for the separation, the set of levels that would be used and the number of dots corresponding to the different levels are decided. These decisions are based on the input level for the separation and input levels for the prior process separations. The location of the dots to be printed for the different levels for the separation is then decided by using the halftone screen, while simultaneously taking into account the placement of printed dots for the prior separations. The selection is done so as to best disperse dots and minimize overlap.

摘要翻译： 提供了一种使用单个屏幕进行多次分色的多级连续填充半色调处理来渲染具有多个分色的彩色图像的方法。 对于待处理的分离，首先，从分离的可能的多个级别中，决定将使用的级别集合和对应于不同级别的点数。 这些决定基于先前过程分离的分离和输入水平的输入水平。 然后通过使用半色调屏幕来确定要分离的不同级别要打印的点的位置，同时考虑用于先前分离的打印点的位置。 进行选择以便最佳地分散点并最小化重叠。

公开(公告)号：US20050271265A1

公开(公告)日：2005-12-08

申请号：US10861855

申请日：2004-06-04

申请人： Shen-Ge Wang ,  Reiner Eschbach ,  Gaurav Sharma

发明人： Shen-Ge Wang ,  Reiner Eschbach ,  Gaurav Sharma

IPC分类号： G06K9/20 ,  G06K9/34 ,  G06K9/46 ,  G06K9/62

CPC分类号： G06K9/00456

摘要： A method for automatically classifying a printed image, includes scanning the printed image; selecting an n by n block of pixels from the scanned image; calculating an array of DCT coefficients of the pixel block, wherein the array of calculated DCT coefficients are representative of spatial frequency and spatial orientation of the pixel block; comparing the DCT coefficients with an array of predetermined values, wherein the array of predetermined values are indicative of different image marking processes used to produce printed images; and determining an image marking process used to create the printed image based on the comparison of the DCT coefficients with the array of predetermined values. The array of DCT coefficients may be sampled into a feature set and the feature set provided to a neural network to output the determined image marking process.

摘要翻译： 一种用于自动分类打印图像的方法，包括扫描印刷图像; 从扫描图像中选择n×n个像素块; 计算所述像素块的DCT系数的阵列，其中所计算的DCT系数的阵列代表所述像素块的空间频率和空间取向; 将DCT系数与预定值的阵列进行比较，其中预定值的阵列指示用于产生打印图像的不同图像标记处理; 以及基于DCT系数与预定值的阵列的比较来确定用于创建打印图像的图像标记处理。 DCT系数的阵列可以被采样到特征集中，并且将特征集提供给神经网络以输出确定的图像标记过程。

公开(公告)号：US06647140B1

公开(公告)日：2003-11-11

申请号：US09313735

申请日：1999-05-18

申请人： Shen-Ge Wang ,  Gaurav Sharma

发明人： Shen-Ge Wang ,  Gaurav Sharma

IPC分类号： G06K900

CPC分类号： H04N1/6094 ,  H04N1/60

摘要： A spectrum inverter receives optical values from a scanning device and applies a spectrum inversion method to the optical values. The spectrum inversion method is selected based on a medium identifier that identifies the medium upon which the scanned image is formed. The resulting spectral space values are then output and may be used by an image output device to reproduce the scanned image.

摘要翻译： 光谱逆变器从扫描装置接收光学值，并将光谱反演方法应用于光学值。 基于识别形成扫描图像的介质的介质标识符来选择频谱反转方法。 然后输出所得到的光谱空间值，并且可以由图像输出装置使用以再现扫描图像。

公开(公告)号：US07272261B2

公开(公告)日：2007-09-18

申请号：US10861855

申请日：2004-06-04

申请人： Shen-Ge Wang ,  Reiner Eschbach ,  Gaurav Sharma

发明人： Shen-Ge Wang ,  Reiner Eschbach ,  Gaurav Sharma

IPC分类号： G06K9/62

CPC分类号： G06K9/00456

摘要： A method for automatically classifying a printed image, includes scanning the printed image; selecting an n by n block of pixels from the scanned image; calculating an array of DCT coefficients of the pixel block, wherein the array of calculated DCT coefficients are representative of spatial frequency and spatial orientation of the pixel block; comparing the DCT coefficients with an array of predetermined values, wherein the array of predetermined values are indicative of different image marking processes used to produce printed images; and determining an image marking process used to create the printed image based on the comparison of the DCT coefficients with the array of predetermined values. The array of DCT coefficients may be sampled into a feature set and the feature set provided to a neural network to output the determined image marking process.

摘要翻译： 一种用于自动分类打印图像的方法，包括扫描印刷图像; 从扫描图像中选择n×n个像素块; 计算所述像素块的DCT系数的阵列，其中所计算的DCT系数的阵列代表所述像素块的空间频率和空间取向; 将DCT系数与预定值的阵列进行比较，其中预定值的阵列指示用于产生打印图像的不同图像标记处理; 以及基于DCT系数与预定值的阵列的比较来确定用于创建打印图像的图像标记处理。 DCT系数的阵列可以被采样到特征集中，并且将特征集提供给神经网络以输出确定的图像标记过程。

公开(公告)号：US06501567B2

公开(公告)日：2002-12-31

申请号：US09737537

申请日：2000-12-15

申请人： Gaurav Sharma ,  Shen-Ge Wang

发明人： Gaurav Sharma ,  Shen-Ge Wang

IPC分类号： G06K1500

CPC分类号： H04N1/52

摘要： A method and system for designing a plurality of correlated stochastic screens or conjugate screen portions intended for use in color halftoning of a corresponding plurality of color separations. A merit function is associated with each screen or screen portion. The merit function represents a measure of the desirability of the screen, particularly with regard to maximizing ink dispersion and optimizing spatial frequency response. An additional merit function value is associated with a combination of the screens and screen portions. Additional merit function represents a measure of desirability of the screen combination with regard to ink dispersion and combined spatial frequency response. The merit functions are iteratively applied to possible screens until an optimized merit value is calculated. The screens are selected that correspond to the optimized merit value. The image is generated using the selected screens in a conventional color halftoning process with a plurality of color separations.

摘要翻译： 一种用于设计用于对应的多个分色的彩色半色调的多个相关随机屏幕或共轭屏幕部分的方法和系统。 优点功能与每个屏幕或屏幕部分相关联。 优点函数表示屏幕的可取性的量度，特别是关于最大化油墨色散和优化空间频率响应。 另外的优点功能值与屏幕和屏幕部分的组合相关联。 额外的功能函数表示对于油墨分散和组合空间频率响应的屏幕组合的期望性的度量。 优点函数被迭代地应用于可能的屏幕，直到计算优化的优值。 选择与优化值相对应的屏幕。 在具有多个分色的常规彩色半色调处理中使用所选择的屏幕生成图像。

公开(公告)号：US07286682B1

公开(公告)日：2007-10-23

申请号：US09652291

申请日：2000-08-31

申请人： Gaurav Sharma ,  Shen-Ge Wang

发明人： Gaurav Sharma ,  Shen-Ge Wang

IPC分类号： G06K9/00

CPC分类号： B41M3/10 ,  B41J3/60 ,  H04N1/00578 ,  H04N1/0058 ,  H04N1/00588 ,  H04N1/00591 ,  H04N1/00631 ,  H04N1/32203 ,  H04N1/32256 ,  H04N1/32304 ,  H04N1/32352

摘要： A printing apparatus and method for duplex printing a document having a show-through watermark wherein the watermark is comprised of first and second images on both sides of the document. The images comprise stoclustic halftone screens having a substantially common registration wherein the second image is relatively shifted from the first image for forming an associated overlay pattern between the first and second images resulting in a recognizable pattern comprising the watermark upon illumination by a show-through light source. The watermark is unrecognizable from either image alone upon illumination from a front light source. The relative shifting can be implemented by either phase, frequency or angle shifting between the front and back side images.

摘要翻译： 一种用于双面打印具有透视水印的文档的打印装置和方法，其中水印由文档两侧的第一和第二图像组成。 这些图像包括具有基本上共同的登记的协同色调网版，其中第二图像相对于第一图像相移，用于在第一图像和第二图像之间形成相关联的重叠图案，导致包含水印的可识别图案， 资源。 从前面的光源照明时，水印从单独的图像中是无法识别的。 相对移位可以通过正面和背面图像之间的相位，频率或角度偏移来实现。

公开(公告)号：US20130010336A1

公开(公告)日：2013-01-10

申请号：US13178962

申请日：2011-07-08

申请人： Shen-Ge Wang ,  Zhigang Fan ,  Robert Paul Loce

发明人： Shen-Ge Wang ,  Zhigang Fan ,  Robert Paul Loce

IPC分类号： H04N1/405

CPC分类号： H04N1/405 ,  H04N1/52

摘要： As set forth herein, computer-implemented methods and systems facilitate the generation of halftone screens for moiré-free color halftoning. A first fundamental frequency vector and a second fundamental frequency vector of a halftone cell are sheared using a selected shearing value. The shearing value is selected as an offset in a fast scanning or slow scanning direction. The selected shearing value satisfies various moiré-free conditions associated with the identified frequency vectors and is capable of being selected for multiple halftone screens. The halftone screens generated using the sheared frequency vectors are used for moiré-free halftoning.

摘要翻译： 如本文所述，计算机实现的方法和系统有助于产生用于无莫尔色彩色调的半色调屏幕。 使用选择的剪切值剪切半色调单元的第一基频和第二基频矢量。 选择剪切值作为快扫或慢扫描方向的偏移量。 所选择的剪切值满足与识别的频率矢量相关的各种无摩擦条件，并且能够被选择用于多个半色调屏幕。 使用剪切频率矢量产生的半色调网屏幕用于无摩纹半色调。

公开(公告)号：US08345314B2

公开(公告)日：2013-01-01

申请号：US12276851

申请日：2008-11-24

申请人： Shen-Ge Wang ,  Reiner Eschbach ,  William A. Fuss

发明人： Shen-Ge Wang ,  Reiner Eschbach ,  William A. Fuss

IPC分类号： H04N1/40

CPC分类号： H04N1/4058 ,  H04N1/00867 ,  H04N1/0087 ,  H04N1/00883 ,  H04N1/32208 ,  H04N1/32251 ,  H04N1/32256 ,  H04N1/32309

摘要： Disclosed are methods/systems to embed a watermark into a contone image. Specifically, the disclosed methods and systems spatially modulate a contone image substantially adjacent a watermark area according to a first polarization and spatially modulate the contone image substantially within the watermark area according to a second polarization. These spatially modulated images may then be subsequently processed, stored, communicated and/or rendered.

摘要翻译： 公开了将水印嵌入到连续色调图像中的方法/系统。 具体地，所公开的方法和系统根据第一偏振空间地调制基本上与水印区域相邻的连续色调图像，并且根据第二偏振基本上在水印区域内空间调制连续色调图像。 随后可以对这些空间调制图像进行处理，存储，传送和/或渲染。

公开(公告)号：US08339674B2

公开(公告)日：2012-12-25

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： H04N1/401 ,  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： 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。 确定颜色通道的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来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中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平均预测的音调响应曲线来存储平均预测的音调响应。

公开(公告)号：US08045218B2

公开(公告)日：2011-10-25

申请号：US12251808

申请日：2008-10-15

申请人： Mu Qiao ,  Robert P. Loce ,  Shen-Ge Wang ,  Daniel W. Costanza ,  Rakesh S. Kulkarni

发明人： Mu Qiao ,  Robert P. Loce ,  Shen-Ge Wang ,  Daniel W. Costanza ,  Rakesh S. Kulkarni

IPC分类号： H04N1/58

CPC分类号： H04N1/407 ,  G03G15/5062 ,  G03G2215/0161

摘要： A digital image processing method. The method includes printing a first set of reference marks on one side of a substrate with a first print engine; printing a second set of reference marks on the same side of the substrate as the first set of reference marks with a second print engine; sensing both sets of reference marks on the substrate with an image sensing unit and generating a digital image of the reference marks; performing image analysis on the digital image to obtain an image-to-image distortion map where the image-to-image distortion map is a local measure of difference between the first set of reference marks and the second set of reference marks; and generating a compensated customer image by using the image-to-image distortion map to reduce registration errors when using the first and second print engines.

摘要翻译： 数字图像处理方法。 该方法包括用第一印刷引擎在基板的一侧上印刷第一组参考标记; 使用第二打印引擎在与所述第一组参考标记的所述基板的相同侧上打印第二组参考标记; 用图像感测单元感测基板上的两组参考标记，并产生参考标记的数字图像; 对数字图像执行图像分析以获得图像到图像失真图，其中图像到图像失真图是第一组参考标记和第二组参考标记之间的差的局部度量; 以及通过使用图像到图像失真图来生成补偿的客户图像，以减少当使用第一和第二打印引擎时的注册错误。