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：US07719722B2

公开(公告)日：2010-05-18

申请号：US10044468

申请日：2002-01-11

申请人： Gaurav Sharma ,  Shen-ge Wang ,  Zhigang Fan

发明人： Gaurav Sharma ,  Shen-ge Wang ,  Zhigang Fan

IPC分类号： G06K15/00 ,  H04N1/405 ,  B41J2/205

CPC分类号： G06K15/107 ,  H04N1/4053

摘要： A system and method for halftoning for multi-pass rendering of an image in which different pixel locations are rendered in each pass which reduces the effects of inter-pass mis-registration errors. The method of halftoning includes restricting a substantial majority of the pixels turned on to render a tone to the minimum number of passes required to produce the tone. The halftoning method can include generating a stochastic halftone turn-on sequence and re-ordering the turn-on sequence. The halftoning method can also use error diffusion, adding a zero mean bias signal to either the image input pixels or the threshold values. The halftoning method is applicable to color or black and white rendering.

摘要翻译： 用于半色调的系统和方法，用于在每次通过中渲染不同像素位置的图像的多遍渲染，其减少了通过间错误注册错误的影响。 半色调的方法包括将打开的大部分像素限制为产生音调所需的最小通过次数。 半色调方法可以包括产生随机半色调开启序列并重新排序开启序列。 半色调方法还可以使用误差扩散，向图像输入像素或阈值添加零平均偏置信号。 半色调方法适用于彩色或黑白渲染。

公开(公告)号：US06844941B1

公开(公告)日：2005-01-18

申请号：US09602746

申请日：2000-06-23

申请人： Gaurav Sharma ,  Zhigang Fan ,  Shen Ge Wang

发明人： Gaurav Sharma ,  Zhigang Fan ,  Shen Ge Wang

IPC分类号： H04N1/52

CPC分类号： H04N1/52

摘要： A method is provided for rendering a color image with a plurality of separations with a halftone process using a single screen for a plurality of separations. The screen is comprised of a plurality of pixel locations with associated threshold values and the image is comprised of a plurality of separation values. The method includes the steps of rendering a first one of the plurality of separations in accordance with the screen, wherein the plurality of pixel locations are turned on or off at a given pixel location based on a comparison of the image separation value at that pixel with the screen threshold value. The rendering of the next color separation is made in accordance with the rendering of the first separation and the screen, wherein for constant image separation values, pixel locations are turned on for the separation at pixel locations disposed in a highest available luminance region having a lowest available threshold value.

摘要翻译： 提供一种用于通过使用单个屏幕进行多次分离的具有半色调处理的多个分色的彩色图像的方法。 屏幕由具有相关联的阈值的多个像素位置组成，并且图像由多个分离值组成。 该方法包括以下步骤：根据屏幕呈现多个间隔中的第一个，其中基于该像素处的图像分离值与该像素处的图像分离值的比较，多个像素位置在给定像素位置被打开或关闭 屏幕阈值。 根据第一分离和屏幕的渲染，进行下一个分色的渲染，其中对于恒定图像分离值，打开像素位置，以便在布置在具有最低的最高可用亮度区域的像素位置处进行分离 可用阈值。

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：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：US07453604B2

公开(公告)日：2008-11-18

申请号：US10604200

申请日：2003-06-30

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

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

IPC分类号： G06K15/00

CPC分类号： H04N1/00076 ,  G06T7/44 ,  G06T2207/10008 ,  G06T2207/20021 ,  H04N1/00002 ,  H04N1/00005 ,  H04N1/00037 ,  H04N1/00039

摘要： Methods and systems used to automatically identify the marking process used for an image on a substrate based on spatial characteristics and/or color of the image. Image types which are classified and identified include continuous tone images and halftone images. Among halftone images separately identified are inkjet images, xerographic images and lithographic images. Locally adaptive image threshold techniques may be used to determine the spatial characteristics of the image.

摘要翻译： 用于基于图像的空间特征和/或颜色来自动识别用于基底上的图像的标记过程的方法和系统。 分类和识别的图像类型包括连续色调图像和半色调图像。 在分开标识的半色调图像中，是喷墨图像，静电复印图像和平版印刷图像。 本地适应性图像阈值技术可用于确定图像的空间特征。

公开(公告)号：US20080151311A1

公开(公告)日：2008-06-26

申请号：US11615407

申请日：2006-12-22

申请人： Gaurav Sharma ,  Shen-ge Wang

发明人： Gaurav Sharma ,  Shen-ge Wang

IPC分类号： H04N1/40

CPC分类号： H04N1/32144 ,  H04N1/32256 ,  H04N1/32309

摘要： A method for generating an authenticable color image, the color image including a plurality of color separations, wherein an authentication image inserted in the multicolor image is not readily visually perceptible, includes halftoning image data corresponding to a first color separation using a single halftone screen, wherein the halftone screen includes means for generating an authentication image in a color image; and halftoning image data corresponding to a second color separation using the halftone screen and dot placement information for the image data corresponding to the first color separation to form a multicolor image; wherein halftoning of image data corresponding to the second color separation includes placing dots for the second color separation in thresholds of the halftone screen relative to those thresholds occupied by the first color separation in the halftone screen in accordance with a predetermined relationship.

摘要翻译： 一种用于生成可认证彩色图像的方法，所述彩色图像包括多个分色，其中插入所述多色图像中的认证图像不容易在视觉上可感知，包括使用单个半色调屏幕对与第一颜色分离相对应的图像数据进行半色调， 其中所述半色调网屏幕包括用于在彩色图像中生成认证图像的装置; 以及使用所述半色调屏幕对应于第二颜色分离的图像数据和对应于所述第一颜色分离的所述图像数据的点布置信息进行半色调处理，以形成多色图像; 其中对应于所述第二颜色分离的图像数据的半色调包括根据预定关系在所述半色调屏幕中相对于所述半色调屏幕中的所述第一颜色分离占据的所述阈值，在所述半色调屏幕的阈值中放置用于所述第二颜色分离的点。

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。