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    DIGITAL VIDEO CONTENT SECURITY AUTHENTICATION METHOD AND SYSTEM
    11.
    发明申请
    DIGITAL VIDEO CONTENT SECURITY AUTHENTICATION METHOD AND SYSTEM 审中-公开

    公开(公告)号：US20180322604A1

    公开(公告)日：2018-11-08

    申请号：US15571857

    申请日：2016-07-13

    Applicant: SHENZHEN UNIVERSITY

    Inventor： Dongning Zhao ,  Yong Zhang ,  Shengli Zhang ,  Yong Xu ,  Jianyong Chen ,  Yanshan Li

    IPC: G06T1/00

    CPC classification number: G06T1/0021 ,  G06T1/0028 ,  G06T2201/0051 ,  G06T2201/0061 ,  G06T2201/0065 ,  H04N21/8358

    Abstract: The disclosure provides a digital video content security authentication method, wherein the method comprises: a secret information embedding step of selectively modifying a pixel grayscale value for each frame image in a digital video so as to complete the embedding of 1-bit secret information; and a secret information extraction and video authentication step of carrying out secret information extraction from the digital video in which the secret information is embedded according to a key so as to realize the security authentication of the digital video content. The disclosure also provides a digital video content security authentication system. According to the technical scheme provided by the disclosure, the authentication security is improved on the basis of not influencing user experience.

    Methods and arrangements for identifying objects
    12.
    发明授权
    Methods and arrangements for identifying objects 有权

    公开(公告)号：US10078878B2

    公开(公告)日：2018-09-18

    申请号：US14978827

    申请日：2015-12-22

    Applicant: Digimarc Corporation

    Inventor： Yang Bai ,  Eric D. Evans ,  Tomas Filler

    IPC: G06T1/00 ,  G06K9/32 ,  G06K9/20 ,  G06T7/73 ,  G06T7/10 ,  G06T7/194

    CPC classification number: G06T1/005 ,  G06K9/2054 ,  G06K9/3233 ,  G06T7/10 ,  G06T7/194 ,  G06T7/73 ,  G06T2201/0051 ,  G06T2201/0065

    Abstract: In some arrangements, product packaging is digitally watermarked over most of its extent to facilitate high-throughput item identification at retail checkouts. Imagery of such packaging can be analyzed to detect digital watermarking. One claim recites a method comprising: receiving imagery representing two packaged item from a digital camera, each of the packaged items including digital watermarking encoded in packaging on the items; each of the packaged items including digital watermarking encoded in packaging on the items; using one or more programmed electronic processors, analyzing the imagery to detect the digital watermarking; accessing a spatial template associated with the digital watermarking when two or more instances of digital watermarking are detected in a single image frame; comparing spatial areas containing the two or more instances of digital watermarking within the imagery to the spatial template; carrying out an action based on the comparing. Of course, other claims, methods, apparatus and systems are described in this patent document.

    METHOD AND DEVICE FOR IDENTIFYING WHETHER STANDARD PICTURE CONTAINS WATERMARK
    13.
    发明申请
    METHOD AND DEVICE FOR IDENTIFYING WHETHER STANDARD PICTURE CONTAINS WATERMARK 审中-公开

    公开(公告)号：US20180225800A1

    公开(公告)日：2018-08-09

    申请号：US15945613

    申请日：2018-04-04

    Applicant: Tencent Technology (Shenzhen) Company Limited

    Inventor： Chengjie WANG

    IPC: G06T1/00 ,  H04N1/32

    CPC classification number: G06T1/0021 ,  G06K9/2063 ,  G06K9/4604 ,  G06T1/005 ,  G06T2201/0051 ,  G06T2201/0065 ,  H04N1/32149 ,  H04N1/32267

    Abstract: A method for identifying whether a standard picture contains a watermark is provided. After obtaining a set of sample standard pictures, one or more sample pictures in the set of sample standard pictures are adjusted to a preset size. The sample pictures in the set of sample standard pictures do not contain watermark information. Next, an average of pixel attribute values of the sample pictures at pixel positions of the preset size is calculated. The average of the pixel attribute values at the pixel positions of the preset size is normalized to obtain the watermark-presence probabilities of the pixel positions of the preset size. Then, a target picture is adjusted to the preset size and a sum of products of pixel attribute values of the target picture at the pixel positions of the preset size and the corresponding watermark-presence probability are calculated. Finally, it is determined whether the target picture contains a watermark according to the sum of products.

    COMPUTER IMPLEMENTED SYSTEM AND METHOD FOR STEGANOGRAPHY
    14.
    发明申请
    COMPUTER IMPLEMENTED SYSTEM AND METHOD FOR STEGANOGRAPHY 审中-公开

    公开(公告)号：US20180158167A1

    公开(公告)日：2018-06-07

    申请号：US15822726

    申请日：2017-11-27

    Applicant: Zensar Technologies Ltd.

    Inventor： Paritosh Hemchandra Chandorkar

    IPC: G06T1/00 ,  G06T1/20

    CPC classification number: G06T1/005 ,  G06T1/0028 ,  G06T1/20 ,  G06T2201/0051 ,  G06T2201/0065

    Abstract: A computer implemented system for steganography comprises an encoding machine for encoding secret data into a cover image to generate the steganography image, and a decoding machine for extracting the secret data from the steganography image. The encoding machine comprises a first memory, a first processor, an input module and an encoder module. The decoding machine comprises a second memory, a second processor, a receiver module, and a decoder module. The system has a comparatively lower error rate (approx. 19.5-21.5 percent) than the conventional steganography method Optimal Pixel Adjustment Procedure (OPAP).

    WATERMARK BASED CONTENT RECOGNITION IMPROVEMENTS
    15.
    发明申请
    WATERMARK BASED CONTENT RECOGNITION IMPROVEMENTS 审中-公开

    公开(公告)号：US20180146245A1

    公开(公告)日：2018-05-24

    申请号：US15570238

    申请日：2016-04-14

    Applicant: Verance Corporation

    Inventor： Rade Petrovic ,  Joseph M. Winograd

    IPC: H04N21/44 ,  G06F21/16 ,  H04N21/8358 ,  G06T1/00 ,  H04N21/8352

    CPC classification number: H04N21/44008 ,  G06F21/16 ,  G06T1/005 ,  G06T2201/0065 ,  H04N21/8352 ,  H04N21/8358 ,  H04N21/8456

    Abstract: Method, devices, systems and computer program products are described that improve speed and accuracy of watermark detection from multimedia content, and allow faster and better content recognition. One technique for improving detection of boundaries of an embedded multimedia content segment includes detecting a synchronization header and a full watermark from the multimedia content, constructing a predicted watermark segment that is positioned at a predicted distance from the synchronization header, and comparing the group of candidate watermark symbols obtained from the multimedia content to the first predicted watermark segment to obtain a match. The disclosed techniques enable extraction of watermarks from short content segments, and can utilize a shortened payload design to establish media time during content usage.

    HARDWARE-ADAPTABLE WATERMARK SYSTEMS
    16.
    发明申请
    HARDWARE-ADAPTABLE WATERMARK SYSTEMS 审中-公开

    公开(公告)号：US20180144431A1

    公开(公告)日：2018-05-24

    申请号：US15810676

    申请日：2017-11-13

    Applicant: Digimarc Corporation

    Inventor： Jacob L. Boles ,  Ravi K. Sharma ,  John D. Lord

    IPC: G06T1/00 ,  H04N19/42

    CPC classification number: G06T1/005 ,  G06T1/0064 ,  G06T2200/08 ,  G06T2200/28 ,  G06T2201/0065 ,  H04N19/42 ,  H04N19/467

    Abstract: There are many advantages to implementing a watermark-based system using dedicated hardware, rather than using software executing on a general purpose processor. These include higher speed and lower power consumption. However, hardware implementations incur substantial design and development costs. Moreover, because each watermarking application has its own design constraints and parameters, it has not been cost-effective to develop a hardware chip design for each, since such chips would typically not be manufactured in volumes sufficient to bring per-unit costs down to an acceptable level. The present technology provides various techniques for making watermarking hardware adaptable, so that a single chip can serve multiple diverse watermark applications. By so-doing, the advantages of hardware implementation are made available where it was formerly cost-prohibitive, thereby enhancing operation of a great variety of watermark-based systems.

    Method for watermarking a three-dimensional object
    18.
    发明授权
    Method for watermarking a three-dimensional object 有权

    公开(公告)号：US09922392B2

    公开(公告)日：2018-03-20

    申请号：US14924653

    申请日：2015-10-27

    Applicant: THOMSON LICENSING

    Inventor： Xavier Rolland-Neviere ,  Gwenael Doerr ,  Pierre Alliez

    IPC: G06T1/00 ,  G06T17/20

    CPC classification number: G06T1/0092 ,  G06T1/0064 ,  G06T17/205 ,  G06T2201/0051 ,  G06T2201/0065 ,  G06T2201/0083

    Abstract: A method for watermarking a three-dimensional object is disclosed. The three-dimensional object is represented by a mesh. A mesh comprises a plurality of vertices. The method further comprises computing an original thickness signature for said mesh from a plurality of thickness values, wherein a thickness value is computed for a vertex of the mesh; determining a target thickness signature, wherein the target thickness signature is a function of a watermark payload and of the original thickness signature; and modifying a position of at least one vertex of the mesh wherein a thickness signature computed for the modified mesh reaches the target thickness signature and wherein a distortion constraint between the mesh and the modified mesh is satisfied.A method for detecting a watermark in a three-dimensional object, a three-dimensional object carrying a watermark and, devices for implementing the methods are further disclosed.

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