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公开(公告)号：US20210112176A1
公开(公告)日：2021-04-15
申请号：US16599149
申请日：2019-10-11
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 a 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, image content in the image layer is determined. Upon an affirmative determination, a new image layer is generated by adding the determined image content to a white background image layer using a morphological operation. The text layer and the new image layer is compressed using respective compression schemes. The compressed text layer and the new image layer are integrated to generate image data in the MRC file format. The generated image data is stored in a memory device.
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公开(公告)号：US10341671B2
公开(公告)日：2019-07-02
申请号：US15493674
申请日：2017-04-21
Applicant: Xerox Corporation
Inventor： Sainarayanan Gopalakrishnan , Xing Li , Rajasekar Kanagasabai , Clara Cuciurean-Zapan , Vignesh Doss
Abstract: An image compression method includes compressing an input image with first and second compression methods to generate first and second (e.g., lossless and lossy) compressed images. First and second residual layers are generated, based on a difference between the first and second compressed images. Connected components in the residual layers are identified. Each connected component includes a group of one or more pixels that, when mapped to the second compressed image is connected, in first and second directions, to pixels in the second compressed image. A compressed image is generated, which includes, for a connected component identified in the first residual layer, removing corresponding pixels from the second compressed image, and for a connected component identified in the second residual layer, adding corresponding pixels to the second compressed image. The system and method can thus provide file size savings associated with lossy compression while avoiding character replacement.
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公开(公告)号：US09712697B1
公开(公告)日：2017-07-18
申请号：US15001328
申请日：2016-01-20
Applicant: Xerox Corporation
Inventor： Sainarayanan Gopalakrishnan , Vignesh Doss , Sudhagar Subbaian , Dhevendra Alagan Palanivel
CPC classification number: H04N1/0044 , H04N1/00708 , H04N1/00734 , H04N1/00737 , H04N1/00774 , H04N1/19594 , H04N1/393 , H04N1/3935
Abstract: An electronic document image of a document is captured using a camera of a handheld device. A user interface of the handheld device displays an instruction to place the handheld device on the document and to change the magnification of the electronic document image on the user interface until the electronic document image and the document are the same size. The handheld device automatically determines the original size of the document based on the magnification that made the electronic document image and the document the same size when the handheld device was on the document. The handheld device converts the electronic document image into an original size document image file based on the original size of the document.
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公开(公告)号：US09659230B2
公开(公告)日：2017-05-23
申请号：US14830767
申请日：2015-08-20
Applicant: XEROX CORPORATION
Inventor： Sudhagar Subbaian , Sainarayanan Gopalakrishnan , Xing Li , Vignesh Doss , Clara Cuciurean-Zapan
CPC classification number: G06K9/52 , G06K9/3275 , G06K9/46 , G06K9/4604 , G06K9/4647 , G06K9/6201 , G06K9/6218 , G06K2009/4666 , G06T11/00
Abstract: The disclosed embodiments illustrate methods and systems for estimating a skew angle of an image. The method includes identifying a set of measurable blocks from one or more blocks in said image. The method further includes dilating each measurable block, in said set of measurable blocks, with a predetermined regular structure to create a set of modified measurable blocks. The method further includes selecting a second set of measurable blocks from said set of modified measurable blocks based on a size of each modified measurable block in said set of modified measurable blocks. Thereafter, the method includes determining a slope of each measurable block in said second set of measurable blocks. Further, the slope is utilizable to estimate said skew angle of said image. The method is performed by one or more microprocessors.
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15.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
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。
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Patent Agency Ranking
公开(公告)号：US11652950B1
公开(公告)日：2023-05-16
申请号：US17854054
申请日：2022-06-30
Applicant: XEROX CORPORATION
Inventor： Packiya Lakshmi Balusamy , Vignesh Doss , Rajasekar Kanagasabai , Sainarayanan Gopalakrishnan
CPC classification number: H04N1/6027 , G06K15/188 , G06K15/1882 , H04N1/0035 , H04N1/6019 , H04N1/6077
Abstract: The disclosure discloses methods and systems for handling drifting of colors in printing. The method includes receiving a document including the image for printing, the image includes one or more gray and non-gray portions. An input from a user to selectively adjust the color of the gray portions of the image is received. The gray portions of the image are identified. Then, color values associated with the identified gray portions of the image are determined. Based on the user input, the determined color values associated with the gray portions of the image are selectively adjusted, without affecting non-gray color portions of the image to generate an updated image. The updated image is printed and the printed image includes adjusted color for the gray portions of the image such that gray color in the printed image is consistent with gray color of the image in the document.
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公开(公告)号：US10419640B1
公开(公告)日：2019-09-17
申请号：US16009606
申请日：2018-06-15
Applicant: XEROX CORPORATION
Abstract: System(s) and method(s) for text enhancement in printing material saving mode are described. In an example, a method comprises identifying a type of a pixel based on edge tag data associated with the pixel, where the edge tag data is indicative of whether the pixel is an edge pixel or a non-edge pixel. The method further comprises determining at least one material saving parameter based on the type of the pixel. Further, the method comprises modifying a quantization error value based on the at least one material saving parameter. The method further comprises distributing the modified quantization error to a set of unprocessed pixels.
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公开(公告)号：US10033901B1
公开(公告)日：2018-07-24
申请号：US15634478
申请日：2017-06-27
Applicant: Xerox Corporation
Inventor： Krishnamurthy Venugopal Gnanadevalu , Sainarayanan Gopalakrishnan , Mohan Vijayalaya Pandian , Vignesh Doss
Abstract: Methods and systems for copying media. A telescopic and swivel configured pole includes an arm that supports a camera for acquiring an image of media. A flat bed is configured with markers that facilitate imaging and a detection of the DPI of the image of the media located on the flat bed within a boundary of the markers. The pole is adjustable moveable in a telescopic and/or swivel manner for an acquisition and reproduction of the image in a dimensional scale representative of the actual scale of the media.
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公开(公告)号：US20170208185A1
公开(公告)日：2017-07-20
申请号：US15001328
申请日：2016-01-20
Applicant: Xerox Corporation
Inventor： Sainarayanan Gopalakrishnan , Vignesh Doss , Sudhagar Subbaian , Dhevendra Alagan Palanivel
CPC classification number: H04N1/0044 , H04N1/00708 , H04N1/00734 , H04N1/00737 , H04N1/00774 , H04N1/19594 , H04N1/393 , H04N1/3935
Abstract: An electronic document image of a document is captured using a camera of a handheld device. A user interface of the handheld device displays an instruction to place the handheld device on the document and to change the magnification of the electronic document image on the user interface until the electronic document image and the document are the same size. The handheld device automatically determines the original size of the document based on the magnification that made the electronic document image and the document the same size when the handheld device was on the document. The handheld device converts the electronic document image into an original size document image file based on the original size of the document.
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公开(公告)号：US09681023B1
公开(公告)日：2017-06-13
申请号：US15246676
申请日：2016-08-25
Applicant: XEROX CORPORATION
Inventor： Sudhagar Subbaian , Vignesh Doss , Sainarayanan Gopalakrishnan
CPC classification number: H04N1/405 , G06K9/00456 , H04N2201/0094
Abstract: The disclosed embodiments illustrate an image processing method and system for classification of halftone frequencies. Pixel values of a first pixel block in a binary image are converted into first pixel values. A second pixel block comprising second pixel values is generated, based on pixel shifting in the first pixel block by a pre-determined count. A frequency value for a pixel-of-interest in the first pixel block is determined, based on a count of a pre-specified type of third pixel values. Other plurality of frequency values for other pixels-of-interest in other plurality of first pixel blocks are estimated when a mode value, corresponding to a plurality of frequency values of pixels-of-interest in a plurality of first pixel blocks, exceeds a pre-determined threshold mode value. Based on the determined plurality of frequency values, one or more image processing operations on the binary image are performed.
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