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    Utilizing dependency between watermark visibility and location of image sample in color space for embedded signal color direction
    1.
    发明授权
    Utilizing dependency between watermark visibility and location of image sample in color space for embedded signal color direction 有权

    公开(公告)号：US11657469B2

    公开(公告)日：2023-05-23

    申请号：US17358873

    申请日：2021-06-25

    Applicant: Digimarc Corporation

    Inventor： Alastair M. Reed ,  Kristyn R. Falkenstern

    IPC: G06T1/00

    CPC classification number: G06T1/005 ,  G06T1/0028 ,  G06T2201/0053 ,  G06T2201/0061

    Abstract: The present disclosure relates generally to signal encoding for printed objects. One implementation selects an embed direction based on a minimal visibility axis of a 1 JND ellipse at a certain color center. One claim recites an apparatus comprising: memory for storing chromatic contrast sensitivity data representing multiple color encoding angles; one or more multi-core processors configured for: using the stored chromatic contrast sensitivity data, generating an ellipse around a first color center; and from the ellipse, determining a signal encode direction, the signal encode direction comprising an angle α representing a negative angle between the ‘a*’ axis in an CIELAB space and a direction of minimum sensitivity of an encoded signal, in which the angle α comprises −9 degrees≥α≥−25 degrees. Other technology described.

    Hierarchical watermark detector
    2.
    发明授权
    Hierarchical watermark detector 有权

    公开(公告)号：US09898792B2

    公开(公告)日：2018-02-20

    申请号：US15232388

    申请日：2016-08-09

    Applicant: Digimarc Corporation

    Inventor： Osama M. Alattar ,  Adnan M. Alattar

    IPC: G06K9/00 ,  G06T1/00 ,  H04N1/32

    CPC classification number: G06T1/005 ,  G06K9/00744 ,  G06T2201/0051 ,  G06T2201/0061 ,  G06T2201/0065 ,  H04N1/32203 ,  H04N1/32267 ,  H04N1/32288 ,  H04N1/32352

    Abstract: The present invention relates generally to digital watermarking. One aspect of the disclosure includes a method comprising: obtaining data representing imagery; using one or more configured processors, analyzing a plurality of portions of the data to detect a watermark orientation component, said analyzing employing a match filter, in which the match filter yields a correlation value for each of the plurality of portions; determining a first portion from the plurality of portions that comprises a correlation value meeting a predetermined value; and directing a watermark decoder at the first portion to decode a plural-bit watermark payload, in which the watermark decoder produces a watermark signature for the first portion, and in which the watermark decoder searches a plurality of areas at or around the first portion to decode the plural-bit watermark payload. Of course, many other aspects and disclosure are provided in this patent document.

    GRID-BASED WATERMARK
    6.
    发明申请
    GRID-BASED WATERMARK 审中-公开

    公开(公告)号：US20170345119A1

    公开(公告)日：2017-11-30

    申请号：US15534056

    申请日：2014-12-15

    Applicant: Hewlett-Packard Development Company, L.P.

    Inventor： Prashant ASTHANA ,  Rajesh BHATIA ,  Baharani NUNNA

    IPC: G06T1/00

    CPC classification number: G06T1/0071 ,  G06T2201/0051 ,  G06T2201/0061 ,  H04N21/8358

    Abstract: An example implementation includes an apparatus including a processor to divide a digital image into a grid including a first grid region and a second grid region. The processor is also to generate a first grid-based watermark using shared watermark information and a first set of grid coordinates associated with the first grid region. The processor is further to generate a second grid-based watermark using the shared watermark information and a second set of grid coordinates associated with the second grid region. The processor is further to embed the first grid-based watermark into a first region of the digital image corresponding to the first grid region and to embed the second grid-based watermark into a second region of the digital image corresponding to the second grid region. The processor is further to generate a machine-readable digital image including the embedded first grid-based watermark and the embedded second grid-based watermark.

    METHOD AND SYSTEM FOR EFFICIENTLY EMBEDDING A WATERMARK IN A DIGITAL IMAGE FOR MOBILE APPLICATIONS
    7.
    发明申请
    METHOD AND SYSTEM FOR EFFICIENTLY EMBEDDING A WATERMARK IN A DIGITAL IMAGE FOR MOBILE APPLICATIONS 审中-公开

    公开(公告)号：US20170148127A1

    公开(公告)日：2017-05-25

    申请号：US14949622

    申请日：2015-11-23

    Applicant: King Abdulaziz City for Science and Technology

    Inventor： Norah Alquwayfili ,  Amr Alasaad

    IPC: G06T1/00

    CPC classification number: G06T1/0028 ,  G06T2201/0061

    Abstract: The invention provides a method and system for embedding a watermark in a digital image and recovering the watermark from the digital image. The method includes representing the plurality of binary bits in the watermark using a plurality of symbols, wherein each symbol of the plurality of symbols represents at least two binary bits. The plurality of symbols are then transformed into a plurality of pseudo noise (PN) sequences, wherein a symbol transformed into a PN sequence represents one or more PN sequence vectors from a set of PN sequence vectors. Once the transformation is done, the plurality of PN sequences are embedded in the digital image to generate a watermarked image. During recovery, the watermark is recovered from the watermarked image by identifying the plurality of PN sequences in the watermarked image for recovering the corresponding plurality of symbols associated with the watermark.

    INFORMATION EMBEDDING DEVICE, INFORMATION EMBEDDING METHOD, AND RECORDING MEDIUM STORING PROGRAM
    9.
    发明申请
    INFORMATION EMBEDDING DEVICE, INFORMATION EMBEDDING METHOD, AND RECORDING MEDIUM STORING PROGRAM 审中-公开
    信息嵌入设备，信息嵌入方法和记录存储程序

    公开(公告)号：US20170061565A1

    公开(公告)日：2017-03-02

    申请号：US15254015

    申请日：2016-09-01

    Applicant: FUJITSU LIMITED

    Inventor： RYUTA TANAKA

    IPC: G06T1/00 ,  G06T7/40 ,  G06T7/00

    CPC classification number: G06T1/0028 ,  G06T2201/0051 ,  G06T2201/0061 ,  G06T2201/0202 ,  H04N19/467

    Abstract: An information embedding device, comprising: a memory; and a processor configured to execute a procedure, the procedure including: from an image, detecting, as an embedding target pixel block, a pixel block having a pixel value that, after being changed by a specific value corresponding to information to be embedded into the image, will be within a first specific range of an average value of pixel values of a surrounding pixel block; and changing the pixel value of the detected embedding target pixel block by the specific value.

    Abstract translation: 一种信息嵌入装置，包括：存储器; 以及处理器，被配置为执行过程，所述过程包括：从图像中检测作为嵌入目标像素块的像素块，所述像素块在被改变了对应于待嵌入的信息的特定值之后的像素值 图像将在周围像素块的像素值的平均值的第一特定范围内; 以及将检测到的嵌入目标像素块的像素值改变为特定值。

    SYSTEMS, METHODS AND DEVICES FOR TAMPER PROOFING DOCUMENTS AND EMBEDDING DATA IN A BIOMETRIC IDENTIFIER
    10.
    发明申请
    SYSTEMS, METHODS AND DEVICES FOR TAMPER PROOFING DOCUMENTS AND EMBEDDING DATA IN A BIOMETRIC IDENTIFIER 有权
    用于篡改文件和生物识别器中嵌入数据的系统，方法和设备

    公开(公告)号：US20160321830A1

    公开(公告)日：2016-11-03

    申请号：US14701426

    申请日：2015-04-30

    Applicant: TigerIT Americas, LLC

    Inventor： Slobodan Cvetkovic ,  Andrey Nikiforov

    IPC: G06T11/60 ,  G06K9/46

    CPC classification number: G06T11/60 ,  G06K9/4671 ,  G06T1/0028 ,  G06T1/005 ,  G06T2201/0051 ,  G06T2201/0061

    Abstract: The present disclosure is directed towards systems, methods and devices for tamper proofing documents by embedding data in a biometric identifier. The biometric identifier may be a real or synthetic fingerprint. In one non-limiting exemplary embodiment, a method for embedding data in a biometric identifier includes determining data to embed in the biometric identifier, determining at least one control parameter, and generating at least one biometric identifier feature. The method further includes including the at least one generated biometric identifier feature in the biometric identifier such that the determined data is embedded in the biometric feature. The determined data is based on a variable data stream. The control parameter controls the generation of at least one biometric identifier feature. The control parameter is based on the determined data. The generated biometric identifier feature is based on the determined control parameter.

    Abstract translation: 本公开涉及通过将数据嵌入生物特征识别符来防止文件的系统，方法和装置。 生物识别标识符可以是真实的或合成的指纹。 在一个非限制性示例性实施例中，用于在生物测定识别器中嵌入数据的方法包括确定数据以嵌入生物测定标识符，确定至少一个控制参数，以及生成至少一个生物特征标识符特征。 所述方法还包括在所述生物特征识别器中包括所述至少一个所生成的生物特征标识符特征，使得所确定的数据嵌入所述生物特征特征中。 所确定的数据基于可变数据流。 控制参数控制生成至少一个生物特征标识符特征。 控制参数基于确定的数据。 所生成的生物特征标识符特征基于所确定的控制参数。

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