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1.发明公开AUTHENTICATING PRINTED OBJECTS USING DIGITAL WATERMARKS ASSOCIATED WITH MULTIDIMENSIONAL QUALITY METRICS 有权采用数字水象星座的认证打印对象的多维质量度量分配
公开(公告)号：EP1485863A2
公开(公告)日：2004-12-15
申请号：EP03709137.8
申请日：2003-02-14
发明人： ZELLER, Claude , MACKAY, Donald, G. , KILMARTIN, William , CORDERY, Robert, A. , BROSSEAU, William, A. , BRUNK, Hugh, L. , DECKER, Stephen, K. , TIAN, Jun
CPC分类号： G06T1/0078 , G06T2201/0202
摘要： The disclosure describes an authentication system and related methods for authenticating printed objects. The system uses an information-based metric along with one or more print quality metrics to provide accurate detection or classification of a counterfeit printed object. The print quality metric evaluates attributes of a subject image associated with the original printer, ink or paper to detect degradation of those operations due to copying operations like an image scanning and halftone printing subsequent to the original printing of the object. The information-based metric measures message symbol errors in an optically readable code, such as a digital watermark.
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2.发明授权
公开(公告)号：EP1467869B1
公开(公告)日：2012-05-30
申请号：EP02797337.9
申请日：2002-12-16
IPC分类号： B41J29/393 , G07B17/00
CPC分类号： B41J29/393 , G07B17/00508 , G07B2017/00637
摘要： A method for assigning unique printer resolutions or signatures, i.e., a unique number of dots per inch, to a class, or models of printers or lines of postage meter (37). The number of dots per inch or resolution may be specified within an image on a document or within a postal indicia (33) and later checked to determine if the image on document or the postal indicia (40) has the correct resolution. The foregoing would be able to detect an image or postal indicia (33) that was scanned into a computer and printed with a printer that did not have the number of dots per inch specified in the image or postal indicia(40).
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3.发明授权AUTHENTICATING PRINTED OBJECTS USING DIGITAL WATERMARKS ASSOCIATED WITH MULTIDIMENSIONAL QUALITY METRICS 有权采用数字水象星座的认证打印对象的多维质量度量分配
公开(公告)号：EP1485863B1
公开(公告)日：2012-05-09
申请号：EP03709137.8
申请日：2003-02-14
发明人： ZELLER, Claude , MACKAY, Donald, G. , KILMARTIN, William , CORDERY, Robert, A. , BROSSEAU, William, A. , BRUNK, Hugh, L. , DECKER, Stephen, K. , TIAN, Jun
IPC分类号： G06T1/00
CPC分类号： G06T1/0078 , G06T2201/0202
摘要： The disclosure describes an authentication system and related methods for authenticating printed objects. The system uses an information-based metric along with one or more print quality metrics to provide accurate detection or classification of a counterfeit printed object. The print quality metric evaluates attributes of a subject image associated with the original printer, ink or paper to detect degradation of those operations due to copying operations like an image scanning and halftone printing subsequent to the original printing of the object. The information-based metric measures message symbol errors in an optically readable code, such as a digital watermark.
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4.发明公开
公开(公告)号：EP1467869A1
公开(公告)日：2004-10-20
申请号：EP02797337.9
申请日：2002-12-16
申请人： PITNEY BOWES INC.
CPC分类号： B41J29/393 , G07B17/00508 , G07B2017/00637
摘要： A method for assigning unique printer resolutions or signatures, i.e., a unique number of dots per inch, to a class, or models of printers or lines of postage meter (37). The number of dots per inch or resolution may be specified within an image on a document or within a postal indicia (33) and later checked to determine if the image on document or the postal indicia (40) has the correct resolution. The foregoing would be able to detect an image or postal indicia (33) that was scanned into a computer and printed with a printer that did not have the number of dots per inch specified in the image or postal indicia(40).
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公开(公告)号：EP1579622A1
公开(公告)日：2005-09-28
申请号：EP03790079.2
申请日：2003-11-26
申请人： Digimarc Corporation
发明人： RODRIGUEZ, Tony, F. , REED, Alastair, M. , SHARMA, Ravi, K. , ALATTAR, Osama, M. , HANNIGAN, Brett, T. , LEVY, Kenneth, L. , BRUNK, Hugh, L.
CPC分类号： H04N1/00846 , H04N1/00002 , H04N1/00005 , H04N1/00037
摘要： This disclosure describes methods for using embedded auxiliary signals in documents for copy detection and other applications. In an application, the auxiliary signal is formed as an array of elements selected from a set of print structures (106) with properties that change differently in response to copy operations. These changes in properties of the print structures that carry the embedded auxiliary signal are automatically detectable. The extent to which the auxiliary data is detected forms a detection metric used in combination with one or more other metrics to differentiate copies from originals. Robust and fragile watermarks are used in Image Replacement Documents for a variety of applications. Digital watermarks act as on-board mediators in authentication of a variety of printed documents. Finally, digital watermarks are used to help manage quality of the scanners used in imaging systems.
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公开(公告)号：EP4323918A1
公开(公告)日：2024-02-21
申请号：EP22725328.3
申请日：2022-04-15
申请人： Digimarc Corporation
发明人： FILLER, Tomas , HOLUB, Vojtech , SHARMA, Ravi, K. , RODRIGUEZ, Tony, F. , ALATTAR, Osama, M. , ALATTAR, Adnan, M. , BRUNK, Hugh, L. , BRADLEY, Brett, A. , KAMATH, Ajith, M.
IPC分类号： G06K19/06
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公开(公告)号：EP3903228A1
公开(公告)日：2021-11-03
申请号：EP20718067.0
申请日：2020-03-13
申请人： Digimarc Corporation
发明人： SHARMA, Ravi, K. , FILLER, Tomas , HOLUB, Vojtech , ALATTAR, Osama, M. , BRUNK, Hugh, L. , LORD, John, D. , RHOADS, Geoffrey, B. , CONWELL, William, Y. , KAMATH, Ajith, M.
IPC分类号： G06K9/20 , B42D25/324 , B42D25/333 , G06K19/06 , G06K19/063 , G06Q10/08 , B29B17/02
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公开(公告)号：EP1579622B1
公开(公告)日：2017-12-20
申请号：EP03790079.2
申请日：2003-11-26
申请人： Digimarc Corporation
发明人： RODRIGUEZ, Tony, F. , REED, Alastair, M. , SHARMA, Ravi, K. , ALATTAR, Osama, M. , HANNIGAN, Brett, T. , LEVY, Kenneth, L. , BRUNK, Hugh, L.
IPC分类号： H04N1/00
CPC分类号： H04N1/00846 , H04N1/00002 , H04N1/00005 , H04N1/00037
摘要： This disclosure describes methods for using embedded auxiliary signals in documents for copy detection and other applications. In an application, the auxiliary signal is formed as an array of elements selected from a set of print structures (106) with properties that change differently in response to copy operations. These changes in properties of the print structures that carry the embedded auxiliary signal are automatically detectable. The extent to which the auxiliary data is detected forms a detection metric used in combination with one or more other metrics to differentiate copies from originals. Robust and fragile watermarks are used in Image Replacement Documents for a variety of applications. Digital watermarks act as on-board mediators in authentication of a variety of printed documents. Finally, digital watermarks are used to help manage quality of the scanners used in imaging systems.
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公开(公告)号：EP1325464A1
公开(公告)日：2003-07-09
申请号：EP01979700.0
申请日：2001-10-10
申请人： Digimarc Corporation
发明人： BRUNK, Hugh, L.
CPC分类号： G06T1/0071 , G06T2201/0051 , H04N17/004 , H04N21/4425 , H04N21/8358
摘要： One method for halftone image watermarking assigns halftone watermark dot values to pseudorandom locations in an image and diffuses the error (106) of the watermark to neighboring pixel locations of these dots. Another method modulates halftone thresholds to convert multilevel pixels to watermarked halftone pixels. This method may be used in conjunction with a robust watermark (110) spread throughout image before embedding the halftone watermark. In a compatible watermark reader (124), digital watermark signal strength is measured by analyzing bit errors in the extracted watermark message signal.
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