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    Method and apparatus for segmenting image into halftone and non-halftone regions
    41.
    发明授权
    Method and apparatus for segmenting image into halftone and non-halftone regions 有权
    将图像分割成半色调和非半色调区域的方法和装置

    公开(公告)号：US09167129B1

    公开(公告)日：2015-10-20

    申请号：US14568820

    申请日：2014-12-12

    Applicant: Xerox Corporation

    Inventor： Sudhagar Subbaian ,  Sainarayanan Gopalakrishnan ,  Vignesh Doss

    IPC: H04N1/04 ,  H04N1/405

    CPC classification number: H04N1/405 ,  H04N1/40062

    Abstract: A method of segmenting an image into halftone and non-halftone regions includes: processing a pixel block of a grayscale image using a thresholding algorithm and an intensity threshold to form a binary block, the pixel block including grayscale pixels with intensity values, the binary block including binary pixels with binary values; identifying a pixel group in the binary block, wherein the pixel group includes connected pixels represented by a select binary value, wherein pixels in the pixel group adjacent to pixels of the pixel block represented by another binary value are identified as boundary pixels of the pixel group; and processing the pixel group using a scale invariant feature transform (SIFT) algorithm to extract keypoints from the pixel group to form a keypoint map in conjunction with segmenting the grayscale image into halftone and non-halftone regions. An image processing device for performing the method is also provided.

    Abstract translation: 将图像分割成半色调和非半色调区域的方法包括：使用阈值算法和强度阈值处理灰度图像的像素块以形成二进制块，所述像素块包括具有强度值的灰度像素，二进制块 包括具有二进制值的二进制像素; 识别所述二进制块中的像素组，其中所述像素组包括由选择二进制值表示的连接像素，其中与由另一二进制值表示的像素块相邻的像素组中的像素被识别为像素组的边界像素 ; 以及使用尺度不变特征变换（SIFT）算法来处理像素组，以从像素组提取关键点，以形成关键点图，并将灰度级图像分割成半色调和非半色调区域。 还提供了一种用于执行该方法的图像处理装置。

    Individualizing reduction of original pages in N-up copying or printing
    42.
    发明授权
    Individualizing reduction of original pages in N-up copying or printing 有权
    在N-up复印或打印中个性化减少原始页面

    公开(公告)号：US09087287B2

    公开(公告)日：2015-07-21

    申请号：US13799017

    申请日：2013-03-13

    Applicant: Xerox Corporation

    Inventor： Sainarayanan Gopalakrishnan ,  Sudhagar Subbaian ,  Clara Cuciurean-Zapan ,  Xing Li

    IPC: G06K15/02 ,  H04N1/387

    CPC classification number: G06K15/1848 ,  H04N1/3875

    Abstract: In response to N-up instructions methods and systems analyze the sizes of printable items within full-size pages to be printed, and determine the minimum size to which each of the full-size pages can be reduced to keep all the printable items above a minimum print item or font size. Because different pages of the print/copy job can have differently sized printable items, at least two of the full-size pages can have a different minimum size to which they can be reduced. Such methods and systems automatically reduce the sizes of the full-size pages (as limited by each potentially different minimum size of each different full-size page) to produce reduced-size pages that will be combined on output pages. Again, because each different full-size page can have a different minimum size, at least two of the full-size pages can be reduced by different reduction amounts during the reduction process.

    Abstract translation: 响应于N-up指令，方法和系统分析要打印的全尺寸页面中的可打印项目的大小，并确定可以缩小每个全尺寸页面的最小尺寸，以将所有可打印项目保持在 最小打印项或字体​​大小。 因为打印/复印作业的不同页面可以具有不同大小的可打印项目，所以至少两个全尺寸页面可以具有不同的最小尺寸，可以减小它们。 这样的方法和系统自动地减小全尺寸页面的大小（由每个不同的全尺寸页面的每个潜在不同的最小尺寸限制），以产生将在输出页面上组合的缩小尺寸的页面。 再次，因为每个不同的全尺寸页面可以具有不同的最小尺寸，所以在缩小过程中可以通过不同的缩小量减少至少两个全尺寸页面。

    METHOD AND SYSTEM FOR INVERSE HALFTONING UTILIZING INVERSE PROJECTION OF PREDICTED ERRORS
    43.
    发明申请
    METHOD AND SYSTEM FOR INVERSE HALFTONING UTILIZING INVERSE PROJECTION OF PREDICTED ERRORS 有权
    使用预测错误的反向投影的逆变换的方法和系统

    公开(公告)号：US20140294298A1

    公开(公告)日：2014-10-02

    申请号：US13850342

    申请日：2013-03-26

    Applicant: XEROX CORPORATION

    Inventor： Dhevendra alagan Palanivel ,  Sainarayanan Gopalakrishnan ,  Clara Cuciurean-Zapan

    IPC: G06T5/00

    CPC classification number: H04N1/4052 ,  H04N1/40075 ,  H04N2201/0094

    Abstract: A method and system generates a reconstructed gray scale image of pixels from a binary image of pixels by reverse propagating an error, in a diffused manner, to the pixels of the binary image to create pixels representing a reconstructed gray scale image. The reverse propagation of the error determines if a current pixel has a first predetermined value; sets an error value to a first error value if the current pixel has the first predetermined value; sets the error value to a second error value if the current pixel does not have the first predetermined value; and propagates a diffused error value to a pixel neighboring the current pixel to create an error diffused pixel, the diffused error value being a product of the set error value and a weighting coefficient associated with the pixel neighboring the current pixel. A Gaussian filter may be utilized to filter the pixels representing a gray scale image to create a filtered reconstructed gray scale image of pixels.

    Abstract translation: 一种方法和系统通过以扩散的方式将错误反向传播到二进制图像的像素来产生来自像素的二进制图像的像素的重构的灰度图像，以创建表示重构的灰度图像的像素。 错误的反向传播确定当前像素是否具有第一预定值; 如果当前像素具有第一预定值，则将误差值设置为第一误差值; 如果当前像素不具有第一预定值，则将误差值设置为第二误差值; 并且将扩散误差值传播到与当前像素相邻的像素以产生误差扩散像素，扩散误差值是设定误差值与与当前像素相邻的像素相关联的加权系数的乘积。 可以使用高斯滤波器来对表示灰度图像的像素进行滤波，以创建像素的滤波重构的灰度级图像。

    INDIVIDUALIZING REDUCTION OF ORIGINAL PAGES IN N-UP COPYING OR PRINTING
    44.
    发明申请
    INDIVIDUALIZING REDUCTION OF ORIGINAL PAGES IN N-UP COPYING OR PRINTING 有权
    在N-UP复印或打印中单独减少原稿页

    公开(公告)号：US20140268185A1

    公开(公告)日：2014-09-18

    申请号：US13799017

    申请日：2013-03-13

    Applicant: XEROX CORPORATION

    Inventor： Sainarayanan Gopalakrishnan ,  Sudhagar Subbaian ,  Clara Cuciurean-Zapan ,  Xing Li

    IPC: G06K15/02

    CPC classification number: G06K15/1848 ,  H04N1/3875

    Abstract: In response to N-up instructions methods and systems analyze the sizes of printable items within full-size pages to be printed, and determine the minimum size to which each of the full-size pages can be reduced to keep all the printable items above a minimum print item or font size. Because different pages of the print/copy job can have differently sized printable items, at least two of the full-size pages can have a different minimum size to which they can be reduced. Such methods and systems automatically reduce the sizes of the full-size pages (as limited by each potentially different minimum size of each different full-size page) to produce reduced-size pages that will be combined on output pages. Again, because each different full-size page can have a different minimum size, at least two of the full-size pages can be reduced by different reduction amounts during the reduction process.

    Abstract translation: 响应于N-up指令，方法和系统分析要打印的全尺寸页面中的可打印项目的大小，并确定可以缩小每个全尺寸页面的最小尺寸，以将所有可打印项目保持在 最小打印项或字体​​大小。 因为打印/复印作业的不同页面可以具有不同大小的可打印项目，所以至少两个全尺寸页面可以具有不同的最小尺寸，可以减小它们。 这样的方法和系统自动地减小全尺寸页面的大小（由每个不同的全尺寸页面的每个潜在不同的最小尺寸限制），以产生将在输出页面上组合的缩小尺寸的页面。 再次，因为每个不同的全尺寸页面可以具有不同的最小尺寸，所以在缩小过程中可以通过不同的缩小量减少至少两个全尺寸页面。

    METHODS AND SYSTEMS FOR AUTOMATICALLY IDENTIFYING IR SECURITY MARKS BASED ON KNOWN HALFTONE FREQUENCY AND COLOR INFORMATION
    48.
    发明申请
    METHODS AND SYSTEMS FOR AUTOMATICALLY IDENTIFYING IR SECURITY MARKS BASED ON KNOWN HALFTONE FREQUENCY AND COLOR INFORMATION 有权

    公开(公告)号：US20230030524A1

    公开(公告)日：2023-02-02

    申请号：US17391253

    申请日：2021-08-02

    Applicant: XEROX CORPORATION

    Inventor： Sainarayanan Gopalakrishnan ,  Rajasekar Kanagasabai ,  Haripriya Chandran

    IPC: G07D7/121 ,  H04N1/00 ,  H04N1/32

    Abstract: The present disclosure discloses methods and systems for detecting an IR security mark in a document based on known color information and halftone frequency information. The method includes receiving a document from a user, including an IR security mark. Then, location information, color information and halftone frequency information are received from the user. The document is scanned. Based on the color information and the location information, the IR security mark is extracted from the scanned document. After this, halftone frequency information of the extracted IR security mark is verified. Based on the verification, text in the extracted IR security mark is identified and is then compared with one or more pre-stored IR security marks to ascertain whether the IR security mark in the document is an authentic security mark.

    PERFORMANCE IMPROVEMENT WITH OBJECT DETECTION FOR SOFTWARE BASED IMAGE PATH
    49.
    发明申请
    PERFORMANCE IMPROVEMENT WITH OBJECT DETECTION FOR SOFTWARE BASED IMAGE PATH 有权

    公开(公告)号：US20220012483A1

    公开(公告)日：2022-01-13

    申请号：US16922283

    申请日：2020-07-07

    Applicant: Xerox Corporation

    Inventor： Xing Li ,  Dhevendra Alagan Palanivel ,  Sainarayanan Gopalakrishnan ,  Rajasekar Kanagasabai

    IPC: G06K9/00 ,  G06K9/46 ,  G06K9/03

    Abstract: A computer-implemented method and system for processing a document page is based on text and non-text detections in an image path. An object block is generated for each image content identified within an input page. the blocks are extracted from the input document for downstream processing. Then, the object blocks are classified based on whether the content is text or non-text. The extracted non-text objects—which are specified by their bounding boxes—are processed separately from the rest of the content. The processing is performed on the text content blocks in parallel. However, when error diffusion is employed, the error diffusion is performed sequentially on the non-text content blocks to avoid stitching artifacts between individually error diffused patches in non-text areas.

    Methods and systems for keyword-based printing
    50.
    发明授权
    Methods and systems for keyword-based printing 有权

    公开(公告)号：US10956107B1

    公开(公告)日：2021-03-23

    申请号：US16811439

    申请日：2020-03-06

    Applicant: XEROX CORPORATION

    Inventor： Sainarayanan Gopalakrishnan ,  Srinivasarao Bindana

    IPC: G06F3/12

    Abstract: The disclosure discloses methods and systems for keyword-based printing. The method includes receiving a request for printing a document. A user interface including a keyword-based printing option is provided. The keyword-based printing option allows a user to submit one or more pages having one or more keywords for printing separately than other pages of the document for printing. Based on the selection of the keyword-based printing option, the one or more keywords are received. A separate media selected for printing the pages having the one or more keywords than a media selected for printing other pages of the document is received. The pages having the one or more keywords are identified. The pages having the keywords and the separate media selected for the pages along with other pages of the document and the media selected for the other pages of the document are sent for printing.

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