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公开(公告)号：US20170255849A1
公开(公告)日：2017-09-07
申请号：US15059748
申请日：2016-03-03
Applicant: Xerox Corporation
Inventor： Xing Li , Vignesh Doss , Sainarayanan Gopalakrishnan
CPC classification number: G06K15/1878 , G06K15/1822 , G06K15/188 , G06K15/1882 , H04N1/407 , H04N1/4072 , H04N1/6008 , H04N1/6022 , H04N1/6027
Abstract: An electronic image in a first color space, used by image acquisition devices, is obtained and converted into a second color space with a larger gamut, to produce a second color space image. Corrections are made to the second color space image to produce a corrected image, without performing background suppression. The corrected image is converted into a third color space, used by printing devices, to produce a third color space image, and this process of converting the corrected image into the third color space includes performing background suppression. This process of converting the corrected image into the third color space samples nodes of the second color space values, classifies the nodes as background nodes or non-background nodes, multiplies the second color space values of the background nodes by a percentage less than 100%, and after multiplying, interpolates values between the nodes.
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公开(公告)号：US09628635B1
公开(公告)日：2017-04-18
申请号：US15198331
申请日：2016-06-30
Applicant: XEROX CORPORATION
CPC classification number: H04N1/00005 , H04N1/00037 , H04N1/00068 , H04N1/405
Abstract: Embodiments of the present disclosure disclose methods and systems for halftone frequency detection in a halftone image. The method includes receiving a first window, a second window, and the halftone image having a predetermined resolution; assigning an active value to a max variable and a min variable associated with each pixel within a first pixel neighborhood defined by the first window based on a pixel intensity value being compared with a three-way threshold set determined based on values a plurality of predetermined statistical parameters; estimating a first frequency estimate and the second frequency estimate based on a number of pixels having active values in the max variable and the min variable respectively within a second pixel neighborhood defined by the second window; and determining the halftone frequency based on the first frequency estimate value, the second frequency estimate value, and the predetermined resolution.
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公开(公告)号：US20170053184A1
公开(公告)日：2017-02-23
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.
Abstract translation: 所公开的实施例示出了用于估计图像的倾斜角度的方法和系统。 该方法包括从所述图像中的一个或多个块识别一组可测量块。 该方法还包括在所述可测量块集合中以预定的规则结构扩展每个可测量块以创建一组修改的可测量块。 该方法还包括基于所述修改的可测量块组中的每个修改的可测量块的大小从所述修改的可测量块组中选择第二组可测量块。 此后，该方法包括确定所述第二组可测量块中的每个可测量块的斜率。 此外，斜率可用于估计所述图像的所述倾斜角。 该方法由一个或多个微处理器执行。
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公开(公告)号：US09384391B2
公开(公告)日：2016-07-05
申请号：US14505517
申请日：2014-10-03
Applicant: Xerox Corporation
Inventor： Sainarayanan Gopalakrishnan , Rajasekar Kanagasabai , Vignesh Doss , Sudhagar Subbaian , Xing Li
CPC classification number: G06K9/00456 , G06F17/212 , G06K9/00422 , G06K9/2063
Abstract: Methods and systems for classifying a region of interest in an electronic document. A first region from the electronic document is extracted. The first region includes at least the region of interest. A first projection profile of pixels is determined in the region of interest. The first projection profile of pixels is indicative of a presence of a content in the region of interest. The region of interest is classified in at least one category based on a comparison of the first projection profile with a predetermined projection profile associated with the region of interest.
Abstract translation: 在电子文件中分类感兴趣区域的方法和系统。 提取电子文档的第一区域。 第一区域至少包括感兴趣的区域。 在感兴趣的区域中确定像素的第一投影轮廓。 像素的第一投影轮廓指示感兴趣区域中的内容的存在。 基于第一投影轮廓与与感兴趣区域相关联的预定投影轮廓的比较，感兴趣区域被分类为至少一个类别。
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公开(公告)号：US20210281715A1
公开(公告)日：2021-09-09
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：US10602019B2
公开(公告)日：2020-03-24
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：US09898693B2
公开(公告)日：2018-02-20
申请号：US15059748
申请日：2016-03-03
Applicant: Xerox Corporation
Inventor： Xing Li , Vignesh Doss , Sainarayanan Gopalakrishnan
CPC classification number: G06K15/1878 , G06K15/1822 , G06K15/188 , G06K15/1882 , H04N1/407 , H04N1/4072 , H04N1/6008 , H04N1/6022 , H04N1/6027
Abstract: An electronic image in a first color space, used by image acquisition devices, is obtained and converted into a second color space with a larger gamut, to produce a second color space image. Corrections are made to the second color space image to produce a corrected image, without performing background suppression. The corrected image is converted into a third color space, used by printing devices, to produce a third color space image, and this process of converting the corrected image into the third color space includes performing background suppression. This process of converting the corrected image into the third color space samples nodes of the second color space values, classifies the nodes as background nodes or non-background nodes, multiplies the second color space values of the background nodes by a percentage less than 100%, and after multiplying, interpolates values between the nodes.
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公开(公告)号：US09237255B1
公开(公告)日：2016-01-12
申请号：US14467303
申请日：2014-08-25
Applicant: Xerox Corporation
Inventor： Sainarayanan Gopalkrishnan , Xing Li , Rajasekar Kanagasabai , Vignesh Doss , Clara Cuciurean-Zapan
CPC classification number: H04N1/40068 , H04N1/41
Abstract: Various embodiments for methods and systems for processing a document are disclosed. A font size associated with each of one or more text regions included in the document is determined. A first resolution of each of the one or more text regions is modified based on respective font size associated with each of the one or more text regions to generate a multi-resolution document.
Abstract translation: 公开了用于处理文档的方法和系统的各种实施例。 确定与文档中包括的一个或多个文本区域中的每一个相关联的字体大小。 基于与一个或多个文本区域中的每一个相关联的相应字体大小来修改一个或多个文本区域中的每一个的第一分辨率，以生成多分辨率文档。
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9.发明授权公开(公告)号：US09124841B2
公开(公告)日：2015-09-01
申请号：US14089894
申请日：2013-11-26
Applicant: XEROX CORPORATION
Inventor： Sudhagar Subbaian , Sainarayanan Gopalakrishnan , Vignesh Doss , Xing Li , Clara Cuciurean-Zapan
CPC classification number: H04N1/40018 , G06T5/009 , G06T7/11 , G06T7/41 , G06T2207/20112 , H04N1/4051 , H04N2201/32
Abstract: Methods and systems receive an input image into a computerized device, create different binary images by applying different threshold measures to the input image using the computerized device, and identify components of a first binary image of the binary images using the computerized device. Such methods and systems also compare pixels of each of the components of the first binary image with corresponding pixels of a second binary image of the binary images to identify pixel differences using the computerized device. This allows these methods and systems to identify halftone areas within the input image based on the pixel differences exceeding a limit using the computerized device.
Abstract translation: 方法和系统将输入图像接收到计算机化设备中，通过使用计算机化设备对输入图像应用不同的阈值度量来创建不同的二进制图像，并使用计算机化设备识别二进制图像的第一二进制图像的分量。 这样的方法和系统还将第一二进制图像的每个分量的像素与二进制图像的第二二进制图像的对应像素进行比较，以使用计算机化的设备来识别像素差异。 这允许这些方法和系统基于使用计算机化设备的超过极限的像素差异来识别输入图像内的半色调区域。
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公开(公告)号：US11954931B1
公开(公告)日：2024-04-09
申请号：US17937794
申请日：2022-10-04
Applicant: XEROX CORPORATION
IPC: G06K9/00 , G06V10/28 , G06V20/00 , G06V30/413 , G06V30/414 , G06V30/418
CPC classification number: G06V30/413 , G06V10/28 , G06V20/95 , G06V30/414 , G06V30/418 , G06V2201/13
Abstract: The present disclosure discloses methods and systems for detecting tampering of an infrared (IR) security mark in a document. The method includes receiving the document including the IR security mark, wherein the IR security mark further includes one or more security texts and/or images. The document is scanned to generate scanned data. A portion of the scanned data including the IR security mark is segmented into a plurality of blocks such as blocks of size 32*32. Thereafter, a ratio of white to black pixels is calculated for each block. The calculated ratio is compared with a known threshold for each block. Upon comparison, the IR security mark is detected as a tampered security mark.
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