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    HARDWARE-ADAPTABLE WATERMARK SYSTEMS
    53.
    发明申请
    HARDWARE-ADAPTABLE WATERMARK SYSTEMS 有权
    硬件适配水域系统

    公开(公告)号：US20170004597A1

    公开(公告)日：2017-01-05

    申请号：US14842575

    申请日：2015-09-01

    Applicant: Digimarc Corporation

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

    IPC: G06T1/00 ,  H04N19/42 ,  H04N19/44

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

    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.

    Abstract translation: 使用专用硬件实现基于水印的系统有许多优点，而不是使用在通用处理器上执行的软件。 这些包括更高的速度和更低的功耗。 然而，硬件实现需要大量的设计和开发成本。 此外，因为每个水印应用程序都有自己的设计约束和参数，因此开发硬件芯片设计的每个都不具有成本效益，因为这样的芯片通常不会以足以使单位成本降到一个 可接受水平 本技术提供了用于使水印硬件适应性的各种技术，使得单个芯片可以服务于多个不同的水印应用。 通过这样做，硬件实现的优点在以前是成本高昂的情况下可用，从而增强了各种基于水印的系统的操作。

    SIGNAL PROCESSORS AND METHODS FOR ESTIMATING TRANSFORMATIONS BETWEEN SIGNALS WITH PHASE ESTIMATION
    54.
    发明申请
    SIGNAL PROCESSORS AND METHODS FOR ESTIMATING TRANSFORMATIONS BETWEEN SIGNALS WITH PHASE ESTIMATION 审中-公开

    公开(公告)号：US20160188972A1

    公开(公告)日：2016-06-30

    申请号：US14825014

    申请日：2015-08-12

    Applicant: Digimarc Corporation

    Inventor： Robert G. Lyons ,  John D. Lord

    IPC: G06K9/00 ,  G06K9/52

    CPC classification number: G06K9/522 ,  G06K9/00536 ,  G06K9/6203

    Abstract: A phase estimation method estimates the phase of signal components using a point spread function. The method obtains a point spread function that expresses complex frequencies at a non integer location in terms of integral frequencies, for a complex frequency of a signal at a non integer location in a complex frequency domain. It obtains complex frequencies of the signal for the integral frequencies, and computes a sum of products of the complex frequencies of the signal at the integral frequencies with the corresponding complex values of the point spread function to provide an estimate of phase of the signal at the non integer location.

    Shared secret arrangements and optical data transfer
    56.
    发明授权
    Shared secret arrangements and optical data transfer 有权
    共享秘密安排和光学数据传输

    公开(公告)号：US09008315B2

    公开(公告)日：2015-04-14

    申请号：US13888939

    申请日：2013-05-07

    Applicant: Digimarc Corporation

    Inventor： John D. Lord ,  John Stach

    IPC: H04M1/02 ,  H04B10/114 ,  H04B10/116 ,  H04W12/06 ,  H04L29/06

    CPC classification number: H04L63/0428 ,  H04B10/1141 ,  H04B10/116 ,  H04B10/22 ,  H04L63/083 ,  H04L63/18 ,  H04M1/003 ,  H04M1/0264 ,  H04W12/04 ,  H04W12/06 ,  H04W88/06

    Abstract: Digital data is optically broadcast through an environment by controllably switching the brightness or chrominance of LED solid state lamps, or of other illumination sources (e.g., television screens and backlit computer displays). This optical data channel is useful to convey cryptographic key data by which devices within the environment can authenticate themselves to a secure network. In some embodiments, the optical modulation is sensed by the camera of a smartphone. The row data output by the smartphone's camera sensor is processed to extract the modulated data signal. In some monochrome embodiments, data communication speeds far in excess of the camera's frame rate (e.g., 30/second), or even the camera's row rate (e.g., 14,400/second) are achieved. Still greater rates can be achieved by conveying different data in different chrominance channels. A great number of other features and arrangements are also detailed.

    Abstract translation: 通过可控地切换LED固态灯或其他照明源（例如电视屏幕和背光式计算机显示器）的亮度或色度，通过环境光学广播数字数据。 该光学数据信道用于传达加密密钥数据，通过该加密密钥数据，环境中的设备可以将其自身认证到安全网络。 在一些实施例中，光学调制由智能电话的相机感测。 处理由智能电话摄像机传感器输出的行数据以提取调制数据信号。 在一些单色实施例中，实现远超过相机的帧速率（例如，30 /秒）的数据通信速度，甚至相机的行速率（例如，14,400 /秒）。 通过在不同的色度通道中传送不同的数据可以实现更高的速率。 还详细介绍了许多其他功能和安排。

    Watermark sensing methods and arrangements
    59.
    发明授权
    Watermark sensing methods and arrangements 有权

    公开(公告)号：US11450025B2

    公开(公告)日：2022-09-20

    申请号：US16951308

    申请日：2020-11-18

    Applicant: Digimarc Corporation

    Inventor： Geoffrey B. Rhoads ,  Utkarsh Deshmukh ,  John D. Lord

    IPC: G06K9/36 ,  G06T7/73 ,  G06T7/00 ,  G06T1/00 ,  G06T5/00

    Abstract: The geometric pose of a patch of watermark data is estimated based on the position of a similar, but non-identical, patch of information within a data structure. The information in the data structure corresponds to a tiled array of calibration patterns that is sampled along at least three non-parallel paths. In a particular embodiment, the calibration patterns are sampled so that edges are globally-curved, yet locally-flat. Use of such information in the data structure enables enhanced pose estimation, e.g., speeding up operation, enabling pose estimation from smaller patches of watermark signals, and/or enabling pose estimation from weaker watermark signals. A great variety of other features and arrangements are also detailed.

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