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11.发明授权Method and system for inverse halftoning utilizing inverse projection of predicted errors 有权使用反投影预测误差的逆半色调方法和系统公开(公告)号：US09215345B2
公开(公告)日：2015-12-15
申请号：US13850342
申请日：2013-03-26
Applicant: Xerox Corporation
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。
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公开(公告)号：US12149663B1
公开(公告)日：2024-11-19
申请号：US18530535
申请日：2023-12-06
Applicant: XEROX CORPORATION
Inventor： Rajasekar Kanagasabai , Sainarayanan Gopalakrishnan , Vignesh Doss
IPC: G06V10/75 , G06F21/60 , G06T3/40 , G06V10/22 , G06V10/62 , G06V30/148 , G06V30/18 , G06V30/19 , G06V30/414 , H04N1/00
Abstract: The present disclosure discloses methods and systems for detecting one or more security patterns in a document submitted at a multi-function device. According to the disclosure the document is received at the multi-function device, wherein the document includes at least textual content. Thereafter, a pre-defined operation is performed to detect edges of the at least textual content. Once detected, one or more text edges are filtered based on one or more templates. Further, based on the one or more templates, shape and color of the filtered one or more text edges are analyzed, and accordingly, the presence of the one or more security patterns is ascertained in the submitted document at the multi-function device.
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公开(公告)号：US20220417384A1
公开(公告)日：2022-12-29
申请号：US17357042
申请日：2021-06-24
Applicant: XEROX CORPORATION
Inventor： Srinivasarao Bindana , Shalini Kondore , Sainarayanan Gopalakrishnan , Jagadeeswaran Lakshmipathy
Abstract: The present disclosure discloses methods and systems for allowing a user to add one or more bookmarks while scanning a document. The method includes receiving a document for scanning from a user. Once received, a user interface is displayed to the user to select an option to add one or more bookmark to the document. The document is scanned to get scanned pages of the document. Based on the selection of the option by the user, one or more bookmarks are added to one or more scanned pages of the document. The scanned document including the one or more bookmarked pages is sent to the one or more recipients for the desired action.
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公开(公告)号：US11509791B1
公开(公告)日：2022-11-22
申请号：US17391190
申请日：2021-08-02
Applicant: XEROX CORPORATION
Abstract: The present disclosure discloses methods and systems for automatically detecting Infrared (IR) security mark based on unknown halftone frequency information. The method includes receiving a document from a user including an IR security mark. The document is scanned. Then, one or more halftone frequencies associated with the IR security mark portion are estimated. Based on the estimation, the IR security mark portion is classified into a background region and the IR marked region including the IR security mark. The IR security mark is extracted and pixels falling in the IR marked region are reconstructed to identify content in the IR security mark. Finally, the identified content is compared with one or more pre-stored IR security marks to ascertain the presence of the IR security mark in the document for further assessment. This way, the method automatically detects the IR security mark in the document.
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公开(公告)号：US11128782B1
公开(公告)日：2021-09-21
申请号：US16812652
申请日：2020-03-09
Applicant: Xerox Corporation
Inventor： Sainarayanan Gopalakrishnan , Vignesh Doss , Rajasekar Kanagasabai
Abstract: A method for detecting background color of a scanned document uses dynamic weights to adjust components of the L*a*b* color space. In accordance with one aspect of the disclosure, the L*a*b* values belonging to pixels within a block are applied to a series of thresholds. In response to the L*a*b* values meeting the thresholds, a given color pixel within the block is reclassified as being monochromatic. The weight values are dynamically updated based on at least one of the L*a*b* values of the given pixel. The thresholding is repeated for remaining pixels in the document. Using the classified pixels, an output document is generated where the background pixels are monochromatic. The output document is transmitted to a display device in communication with the server computer.
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Patent Agency Ranking
公开(公告)号：US11087126B2
公开(公告)日：2021-08-10
申请号：US16441601
申请日：2019-06-14
Applicant: Xerox Corporation
Inventor： Xing Li , Dhevendra Alagan Palanivel , Sainarayanan Gopalakrishnan , Rajasekar Kanagasabai
Abstract: A document processing system produces a digital representation of an original image by determining a background level for white space of the original image. Using the background level, the system identifies pixels not belonging to the white space. The system generates a binary image of the original image based from the identified pixels. The system then identifies image content surrounded by the white space in the original image using the binary image. Next, the system generates a block for each image content and extracts each block from the original image. After processing each block, the system reapplies the processed blocks to a blank canvas to generate the digital representation.
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公开(公告)号：US10976973B2
公开(公告)日：2021-04-13
申请号：US16439137
申请日：2019-06-12
Applicant: XEROX CORPORATION
Abstract: Systems, methods, and devices are configured to share a printable electronic document created as part of a job, such as a print, copy, or scan job, between users. They include receiving a command to print an electronic document associated with a job initiated on a multi-function device, the job initiated in response to an input from a first user. They further include receiving an input to share the electronic document associated with the job with a second user and identifying the second user. They also include sending a notification message to the identified second user, the notification message indicating an availability of the electronic document associated with the job to the identified second user.
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公开(公告)号：US10915273B2
公开(公告)日：2021-02-09
申请号：US16405117
申请日：2019-05-07
Applicant: XEROX CORPORATION
Inventor： Srinivasarao Bindana , Sainarayanan Gopalakrishnan
IPC: G06F3/12
Abstract: Systems, methods, and devices are configured to identify and print a replacement version of an electronic document. They include receiving an electronic document as part of a print request from a user. They also include accessing at least one document retention location associated with the received electronic document and comparing a set of electronic documents in the at least one document retention location with the received electronic document. They further include providing a notification to the user, the notification comprising identification of at least one electronic document from the set of electronic documents for review as a replacement electronic document for the received electronic document.
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19.发明申请公开(公告)号：US20200028987A1
公开(公告)日：2020-01-23
申请号：US16039405
申请日：2018-07-19
Applicant: XEROX CORPORATION
Inventor： Sainarayanan Gopalakrishnan , Rajasekar Kanagasabai , Vignesh Doss
Abstract: Examples of systems and methods for enhancing image quality for documents with highlighted portions are described. A highlighted portion from a received input is detected. The highlighted portion is automatically segmented as a text layer and the remaining portion is further segmented as a separate text layer and an image layer. A resolution is assigned to the highlighted portion, wherein the resolution assigned to the highlighted portion is greater than the respective resolution for the text layer and the image layer, to improve quality of the highlighted portion. The text layer corresponding to the highlighted portion and the separate text layer and the image layer are integrated together to generate a scanned document in a Mixed Raster Content (MRC) file format.
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公开(公告)号：US10142520B1
公开(公告)日：2018-11-27
申请号：US15635260
申请日：2017-06-28
Applicant: XEROX CORPORATION
Inventor： Sainarayanan Gopalakrishnan , Rajasekar Kanagasabai , Vignesh Doss
Abstract: The present disclosure discloses methods and systems for generating a mixed raster content (MRC) format file for single background color image document. The method includes receiving an input document at an image capturing device. The input document is segmented into an image layer and a text layer. Then it is determined whether the image layer including a single background color. Upon affirmative determination, a new text layer with a background color mask is generated. The text layer and the new text layer is compressed using a compression scheme. The compressed text layer and the new text layer are integrated to generate an image data in the MRC file format. The generated image data is stored in a memory device.
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