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    Watermark detection utilizing regions with higher probability of success
    1.
    发明授权
    Watermark detection utilizing regions with higher probability of success 有权

    公开(公告)号：US06442284B1

    公开(公告)日：2002-08-27

    申请号：US09302663

    申请日：1999-04-30

    申请人： Ammon Gustafson ,  Geoffrey Rhoads ,  Adnan V. Alattar ,  Ravi K. Sharma ,  Clay Davidson

    发明人： Ammon Gustafson ,  Geoffrey Rhoads ,  Adnan V. Alattar ,  Ravi K. Sharma ,  Clay Davidson

    IPC分类号： G06K900

    CPC分类号： G06T1/0078

    摘要： The present invention detects the presence of a watermark in-an image by using a multi-step process. First, the image is examined to determine which regions of the image have characteristics such that there is a high probability that a watermark signal can be detected in that region of the image. Next the regions that have a high probability that a watermark can be detected (in contrast to all regions of the image) are examined to find watermark data. In order to determine the probability of finding watermark data in a particular region of an image, the amount of “variance” in the intensity of the pixels in the region is first examined. For example a region that is entirely white or entirely black has zero variance in luminance. Such a region can not carry watermark data, hence regions with zero or low variance can be eliminated from further processing. Furthermore, if a high variance in a region is a result of the fact that the region has an abrupt border or edge between two highly contrasting regions, the high variance does not indicate a high probability that a watermark signal will be detected in the region. Therefore, after regions with high variance are located, these regions are next examined to look for regions with high edginess spread. Finally, regions with the high variance and high edginess spread are selected for further processing to detect watermark data. For those regions selected for further processing, the detection process can be enhanced by filtering the data with a two step process to increase the signal to noise ratio of the watermark signal. First a high pass filter (e.g. a Laplacian operator) is applied to each region. This filtering operation in effect established a new intensity value for each pixel in the region. Next a nonlinear operator (e.g. a signum function) is applied to the output from the first filter operation. The resulting data is examined to detect watermark data.

    Pre-filteriing to increase watermark signal-to-noise ratio
    2.
    发明授权
    Pre-filteriing to increase watermark signal-to-noise ratio 有权
    预过滤以增加水印信噪比

    公开(公告)号：US06988202B1

    公开(公告)日：2006-01-17

    申请号：US09527971

    申请日：2000-03-17

    申请人： Geoffrey Rhoads ,  Adnam M. Alattar ,  Ravi K. Sharma

    发明人： Geoffrey Rhoads ,  Adnam M. Alattar ,  Ravi K. Sharma

    IPC分类号： G06F11/30

    CPC分类号： G06T1/005 ,  G06T2201/0065 ,  H04N1/32154 ,  H04N1/32267 ,  H04N1/3232 ,  H04N1/32336

    摘要： Utilizes pre-processing (pre-filtering) of target data in order to facilitate and enable robust extraction of a watermark signal. With the present invention the watermarked data is pre-filtered using knowledge of the watermark signal. That is, utilizing knowledge of the characteristics of the watermark signal (for example that it falls in a certain frequency range), aspects or portions of the signal that do not carry the watermark signal are eliminated by filtering. Such filtering can amplify the watermark signal and/or simultaneously reduces the strength of the original (host) content or noise in the data signal that contains the watermark. That is, pre-filtering increases the signal-to-noise ratio of the watermark signal and facilitates the watermark extraction steps (detection and decoding). With the present invention it is possible to extract weak watermark signals from target data.

    摘要翻译： 利用目标数据的预处理（预过滤），以促进和实现水印信号的鲁棒提取。 利用本发明，使用水印信号的知识对水印数据进行预滤波。 也就是说，利用水印信号的特性的知识（例如，它落在一定的频率范围内），通过滤波来消除不携带水印信号的信号的方面或部分。 这样的滤波可以放大水印信号和/或同时降低包含水印的数据信号中的原始（主机）内容或噪声的强度。 也就是说，预滤波增加了水印信号的信噪比，并促进了水印提取步骤（检测和解码）。 利用本发明，可以从目标数据中提取弱水印信号。

    Content serialization by varying content properties, including varying master copy watermark properties
    3.
    发明授权
    Content serialization by varying content properties, including varying master copy watermark properties 有权

    公开(公告)号：US10129429B2

    公开(公告)日：2018-11-13

    申请号：US12245605

    申请日：2008-10-03

    申请人： Rajan Samtani ,  Joel R. Meyer ,  Ravi K. Sharma

    发明人： Rajan Samtani ,  Joel R. Meyer ,  Ravi K. Sharma

    IPC分类号： H04N1/32 ,  G06F21/10 ,  G06T1/00 ,  H04N19/467 ,  G11B20/00

    摘要： This disclosure describes novel methods for generating unique copies of content. One method combines the functions of the master copy and unique copy watermarks. In particular, the method generates a unique copy by varying the manner in which the master copy watermark is embedded in unique copies of a content item. In one embodiment, the master copy watermark is repeated within the content item and its location is varied in a unique pattern that comprises the unique copy watermark. The unique copy is generated by producing a copy in which master copy watermarks are embedded in a unique pattern. For instance in one embodiment, the locations of the master copy watermarks in the content item are represented as a vector of delta values in which each delta value corresponds to the distance between a corresponding instance of the master copy watermark, and a neighboring instance of the master copy watermark. This vector is stored in a transaction record in association with transaction information, such as information identifying the master copy and information associated with the unique copy. Other ways of representing the unique pattern of attributes of the master copy watermark are also possible. In other embodiments, properties of the master copy watermark other than its location are varied through the content. The unique copy watermark is conveyed in the vector of deltas in these properties of the master copy watermark. Some examples of these properties of the master copy watermark signal include phase characteristics (e.g., the phase shift of a watermark carrier signal), frequency magnitude characteristics, etc. These properties are varied in a manner that does not alter the information carried in the master copy watermark. However, it does provide a variation that creates a unique copy, and the unique copy watermark is conveyed in this variation. The variation in location of the instances of the master copy watermark can be in different domains, such as a spatial domain, a time domain, a time-space domain, a transform domain (including frequency transform domains), a compressed domain, etc.

    Fast signal detection and distributed computing in portable computing devices
    6.
    发明授权
    Fast signal detection and distributed computing in portable computing devices 有权
    便携式计算设备中的快速信号检测和分布式计算

    公开(公告)号：US08694049B2

    公开(公告)日：2014-04-08

    申请号：US11198004

    申请日：2005-08-05

    申请人： Ravi K. Sharma ,  Tony F. Rodriguez

    发明人： Ravi K. Sharma ,  Tony F. Rodriguez

    IPC分类号： H04M1/00 ,  G06F15/16 ,  G06K9/00

    CPC分类号： G06F17/30743 ,  G05B2219/24162 ,  G06K9/00503 ,  G06K9/0053 ,  G06T1/0064 ,  G06T2201/0052 ,  G10L25/18 ,  G10L25/21 ,  H04M1/0264 ,  H04N1/00204 ,  H04N1/00244 ,  H04N1/00307 ,  H04N1/00358 ,  H04N1/00363 ,  H04N1/00973 ,  H04N1/32117 ,  H04N1/32144 ,  H04N1/3216 ,  H04N2201/0096 ,  H04N2201/3226 ,  H04N2201/3233 ,  H04N2201/327 ,  H04N2201/3278 ,  H04W88/02

    摘要： This disclosure describes a distributed reader architecture for a mobile computing device such as cellular telephone handset. This architecture includes a reader library that reads device capabilities and business model parameters in the device, and in response, for selects an appropriate configuration of reader modules for identifying a content item. The reader modules each perform a function used in identifying a content item. The modules are selected so that the resources available on the device and in remote devices are used optimally, depending on available computing resources on the device and network bandwidth. One example of a reader module is a fast watermark detection module that quickly detects the presence of a watermark, enabling resources to be focused on portions of content that are most likely going to lead to successful content identification. A watermark signal structure for fast watermark detection is comprised of a dense array of impulse functions in a form of a circle in a Fourier magnitude domain, and the impulse functions having pseudorandom phase. Alternative structures are possible.

    摘要翻译： 本公开描述了用于诸如蜂窝电话手机的移动计算设备的分布式读取器架构。 该架构包括阅读器库，其读取设备中的设备能力和业务模型参数，并且作为响应，用于选择用于识别内容项目的读取器模块的适当配置。 读取器模块各自执行用于识别内容项目的功能。 选择这些模块，以便根据设备上可用的计算资源和网络带宽，最佳地使用设备和远程设备上可用的资源。 读取器模块的一个示例是快速检测水印的存在的快速水印检测模块，使资源能够集中在最有可能导致成功的内容识别的内容的部分上。 用于快速水印检测的水印信号结构由傅里叶级数域中的圆形脉冲函数的密集阵列组成，脉冲函数具有伪随机相位。 替代结构是可能的。

    Authenticating Identification and Security Documents and Other Objects
    7.
    发明申请
    Authenticating Identification and Security Documents and Other Objects 有权
    认证和安全文件及其他对象

    公开(公告)号：US20130172048A1

    公开(公告)日：2013-07-04

    申请号：US13488942

    申请日：2012-06-05

    申请人： Tony F. Rodriguez ,  Geoffrey B. Rhoads ,  Ravi K. Sharma

    发明人： Tony F. Rodriguez ,  Geoffrey B. Rhoads ,  Ravi K. Sharma

    IPC分类号： G06T1/00 ,  G06K9/46

    CPC分类号： B42D25/333 ,  B41M3/10 ,  B42D25/00 ,  B42D25/23 ,  B42D25/328 ,  B42D2033/20 ,  B42D2035/24 ,  G06K9/22 ,  G06K9/46 ,  G06T1/0021 ,  G06T1/0028 ,  G06T2201/0051 ,  G07D7/0051 ,  G07D7/0053 ,  G07D7/0055 ,  G07D7/0057 ,  G07D7/12 ,  G07D7/20

    摘要： The application discloses identification and security documents and methods and systems for authenticating such identification and security documents. In one implementation, a document includes a first surface; and a second surface. The first surface comprises a first set of print structures and a second set of print structures. The first set of print structures and the second set of print structures cooperate to obscure the location on the first surface of the second set of print structures. The second set of print structures is arranged on the first surface so as to provide a reflection pattern. In one example, the reflection pattern includes a diffraction grating. The second set of print structures is preferably provided on the first surface with metallic ink. Of course, other claims and combinations are provided too.

    摘要翻译： 该申请公开了用于认证这种识别和安全文件的识别和安全文件和方法和系统。 在一个实现中，文档包括第一表面; 和第二表面。 第一表面包括第一组打印结构和第二组打印结构。 第一组打印结构和第二组打印结构相配合以掩盖第二组打印结构的第一表面上的位置。 第二组打印结构布置在第一表面上以提供反射图案。 在一个示例中，反射图案包括衍射光栅。 第二组打印结构优选地在金属墨水的第一表面上设置。 当然，也提供其他权利要求和组合。

    Watermarking systems and methods
    8.
    发明授权
    Watermarking systems and methods 有权
    水印系统和方法

    公开(公告)号：US08005259B2

    公开(公告)日：2011-08-23

    申请号：US12763417

    申请日：2010-04-20

    申请人： Kenneth L. Levy ,  Ravi K. Sharma ,  Lance Lixin Shen ,  John Stach

    发明人： Kenneth L. Levy ,  Ravi K. Sharma ,  Lance Lixin Shen ,  John Stach

    IPC分类号： G06K9/00

    CPC分类号： G06T1/0064

    摘要： Various improvements and applications for digital watermarking technology are detailed. One concerns techniques for making watermarks resistant to malicious attacks. Another involves using digital watermarking with ID cards and credentials, such as a watermarked driver's license conveying a user's cryptographic PKI. Still another uses digital watermarks in connection with automated compliance audits for corporate users of electronic content. A variety of other technologies are also detailed.

    摘要翻译： 详细介绍了数字水印技术的各种改进和应用。 一个涉及使水印抵御恶意攻击的技术。 另一个涉及使用ID卡和凭证的数字水印，例如传达用户密码PKI的带有水印的驾驶执照。 还有另一个使用电子水印与电子内容的企业用户的自动化合规性审核相关联。 还详细介绍了各种其他技术。

    Access control systems
    9.
    发明授权
    Access control systems 有权
    门禁系统

    公开(公告)号：US07958359B2

    公开(公告)日：2011-06-07

    申请号：US10275197

    申请日：2001-04-30

    申请人： Ravi K. Sharma ,  Marc D. Miller ,  Kenneth L. Levy

    发明人： Ravi K. Sharma ,  Marc D. Miller ,  Kenneth L. Levy

    IPC分类号： H04L9/32 ,  G06K9/00 ,  G08B19/00

    CPC分类号： G06Q30/06 ,  G06Q20/3823 ,  G06Q20/3827 ,  H04N1/00204 ,  H04N2201/3235 ,  H04N2201/327

    摘要： The present invention relates generally to access control. One claim recites a method of determining whether to allow access to a location, including: receiving optical data from an optical sensor, the optical data being associated with an object presented to the optical sensor, wherein the object comprises optically-detectable, machine-readable indicia encoded in a predetermined symbology thereon, the indicia including at least an orientation component; determining an orientation of the orientation component; obtaining from a data store a predetermined orientation; and comparing the predetermined orientation with the determined orientation to decide whether to allow access to the location. Of course, other claims are provided as well.

    摘要翻译： 本发明一般涉及访问控制。 一个权利要求描述了确定是否允许访问位置的方法，包括：从光学传感器接收光学数据，所述光学数据与呈现给所述光学传感器的物体相关联，其中所述对象包括光学可检测的，机器可读的 标记以其中的预定符号编码，所述标记至少包括取向分量; 确定取向分量的取向; 从数据存储器获取预定取向; 以及将所述预定取向与所确定的方向进行比较以决定是否允许访问所述位置。 当然，也提供其他权利要求。

    Combined Watermarking and Fingerprinting
    10.
    发明申请
    Combined Watermarking and Fingerprinting 有权
    组合水印和指纹图像

    公开(公告)号：US20100322469A1

    公开(公告)日：2010-12-23

    申请号：US12785290

    申请日：2010-05-21

    申请人： Ravi K. Sharma

    发明人： Ravi K. Sharma

    IPC分类号： G06K9/00 ,  G06F17/30

    CPC分类号： G10L19/018 ,  G06T1/0028

    摘要： Content fingerprints and watermarks are combined in various ways for content identification applications. Fingerprints are used to identify content generally while watermarks provide more detailed localization of parts within the content, and vice versa. Fingerprint techniques are further used for signal synchronization and other pre-processing steps to assist in digital watermark decoding. A variety of fingerprint/watermark techniques identify characteristics of the channel of content from content samples.

    摘要翻译： 内容指纹和水印以各种方式组合，用于内容识别应用。 指纹用于一般地识别内容，而水印在内容中提供更详细的部分定位，反之亦然。 指纹技术进一步用于信号同步和其他预处理步骤以辅助数字水印解码。 各种指纹/水印技术从内容样本中识别出内容通道的特征。