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    Watermark orientation signals conveying payload data
    11.
    发明申请
    Watermark orientation signals conveying payload data 有权
    水印方向信号传送有效载荷数据

    公开(公告)号：US20060159304A1

    公开(公告)日：2006-07-20

    申请号：US11302974

    申请日：2005-12-13

    Applicant: Ravi Sharma

    Inventor： Ravi Sharma

    IPC: G06K9/00

    CPC classification number: G06T1/0064 ,  G06T1/0071 ,  G06T2201/0052 ,  G06T2201/0065 ,  G06T2201/0601

    Abstract: Steganographic calibration signals (sometimes termed “orientation signals,” “marker signals,” reference signals,” “grid signals,” etc.) are sometimes included with digital watermarking signals so that subsequent distortion of the object thereby marked (e.g., a digital image file, audio clip, document, etc.) can later be discerned and compensated-for. Digital watermark detection systems sometimes fail if the object encompasses several separately-watermarked components (e.g., a scanned magazine page with several different images, or photocopy data resulting from scanning while several documents are on the photocopier platen). Each component may include its own calibration signal, confusing the detection system. In accordance with certain embodiments, this problem is addressed by a proximity-based approach, and/or a multiple grid-based approach. In accordance with other embodiments, the calibration signal can—itself—convey watermark information, so it serves both a calibration and a payload-conveyance function.

    Abstract translation: 隐写校准信号（有时称为“取向信号”，“标记信号”，“参考信号”，“电网信号”等）有时包含在数字水印信号中，从而使得由此标记的物体的后续失真（例如数字图像 文件，音频剪辑，文档等）可以稍后被识别和补偿。如果对象包含几个单独加水印的组件（例如，具有几个不同图像的扫描的杂志页面或者复印数据的结果），则数字水印检测系统有时会失败 根据某些实施例，该问题通过基于邻近的方法和/或多个网格方法来解决，其中，所述检测系统包括： 根据其他实施例，校准信号本身可以传达水印信息，因此它既可用于校准和付费 广告传送功能。

    Method for the estimation and recovering of general affine transform
    13.
    发明授权
    Method for the estimation and recovering of general affine transform 有权
    一般仿射变换的估计和恢复方法

    公开(公告)号：US06904151B2

    公开(公告)日：2005-06-07

    申请号：US10051808

    申请日：2002-01-17

    Applicant: Frédéric Deguillaume ,  Sviatoslav Voloshynovskiy ,  Thierry Pun

    Inventor： Frédéric Deguillaume ,  Sviatoslav Voloshynovskiy ,  Thierry Pun

    IPC: G06K9/64 ,  G06T1/00 ,  G06T3/00 ,  G06K9/00

    CPC classification number: G06T3/0006 ,  G06K9/6211 ,  G06T1/0064 ,  G06T2201/0051 ,  G06T2201/0052 ,  G06T2201/0065 ,  G06T2201/0601

    Abstract: The present invention relates to the methods of estimation and recovering of general affine geometrical transformations which were applied to data, extensible to any other defined class of geometrical transformations, according to the preamble of the dependent claims. The parameters of the undergone deformation are robustly estimated based on maxima given by a parametric transform such as Hough transform or Radon transform of some embedded information with periodical or any other known regular structure. The main applications of this invention are robust digital still image/video watermarking, document authentication, and detection of periodical or hidden patterns. In the case of periodical watermarks, the watermark can also be predistorted before embedding based on a key to defeat block-by-block removal attack.

    Abstract translation: 本发明涉及根据从属权利要求的前序部分，其应用于可扩展到任何其他限定类型的几何变换的数据的一般仿射几何变换的估计和恢复方法。 基于由具有周期性或任何其他已知规则结构的一些嵌入式信息的霍夫变换或氡变换的参数变换给出的最大值来鲁棒地估计经历变形的参数。 本发明的主要应用是稳健的数字静止图像/视频水印，文档认证和周期性或隐藏模式的检测。 在定期水印的情况下，水印还可以在嵌入之前进行预失真，基于一个关键字来消除逐块删除攻击。

    Detection of multiple watermarks and improved watermark calibration signals
    17.
    发明申请
    Detection of multiple watermarks and improved watermark calibration signals 有权
    检测多个水印和改进的水印校准信号

    公开(公告)号：US20020114491A1

    公开(公告)日：2002-08-22

    申请号：US10032282

    申请日：2001-12-20

    Inventor： Ravi K. Sharma ,  Osama M. Alattar

    IPC: G06K009/00

    CPC classification number: G06T1/0071 ,  G06T2201/0052 ,  G06T2201/0065 ,  G06T2201/0601

    Abstract: Steganographic calibration signals (sometimes termed nullorientation signals,null nullmarker signals,null reference signals,null nullgrid signals,null etc.) are sometimes included with digital watermarking signals so that subsequent distortion of the object thereby marked (e.g., a digital image file, audio clip, document, etc.) can later be discerned and compensated-for. Digital watermark detection systems sometimes fail if the object encompasses several separately-watermarked components (e.g., a scanned magazine page with several different images, or photocopy data resulting from scanning while several documents are on the photocopier platen). Each component may include its own calibration signal, confusing the detection system. In accordance with certain embodiments, this problem is addressed by a proximity-based approach, and/or a multiple grid-based approach. In accordance with other embodiments, the calibration signal cannullitselfnullconvey watermark information, so it serves both a calibration and a payload-conveyance function.

    Abstract translation: 隐写校准信号（有时称为“取向信号”，“标记信号”，“参考信号”，“电网信号”等）有时包含在数字水印信号中，从而使得由此标记的物体的后续失真（例如数字图像 文件，音频剪辑，文档等）可以稍后被识别和补偿。如果对象包含几个单独加水印的组件（例如，具有几个不同图像的扫描的杂志页面或者复印数据的结果），则数字水印检测系统有时会失败 根据某些实施例，该问题通过基于邻近的方法和/或多个网格方法来解决，其中，所述检测系统包括： 根据其他实施例，校准信号本身可以传达水印信息，因此它既可用于校准和付费 广告传送功能。

    SIGNAL DECODING METHODS, APPARATUS AND SYSTEMS
    19.
    发明申请
    SIGNAL DECODING METHODS, APPARATUS AND SYSTEMS 有权

    公开(公告)号：US20180005341A1

    公开(公告)日：2018-01-04

    申请号：US15605904

    申请日：2017-05-25

    Applicant: Digimarc Corporation

    Inventor： Alastair M. Reed ,  Ravi K. Sharma

    IPC: G06T1/00 ,  H04N1/32

    CPC classification number: G06T1/0028 ,  G06K9/00 ,  G06T1/0021 ,  G06T1/005 ,  G06T2201/0051 ,  G06T2201/0052 ,  G06T2201/0601 ,  H04N1/32309

    Abstract: The present invention relate generally to signal encoding and decoding. One claim recites a method comprising: obtaining color image data or color video data, the color image data or color video data comprising an encoded signal pattern, the encoded signal pattern aiding detection of an encoded message, the pattern comprising first frequency components and second frequency components, the color image data or color video data comprising first color data and second color data, in which the first color data comprises the first frequency components encoded therein, and the second color data comprises the second frequency components encoded therein; combining the first color data and the second color data, said combining yielding combined color data; utilizing one or more processors or electronic processing circuitry, detecting the encoded signal pattern from the combined color data, said detecting yielding rotation and scale information; and using the rotation and scale information to detect the encoded message from the combined color data. Of course, other combinations and claims are provided too.

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