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    Digital watermarks adapted to compensate for time scaling, pitch shifting and mixing
    91.
    发明授权
    Digital watermarks adapted to compensate for time scaling, pitch shifting and mixing 有权

    公开(公告)号：US10236006B1

    公开(公告)日：2019-03-19

    申请号：US15671090

    申请日：2017-08-07

    Applicant: Digimarc Corporation

    Inventor： Aparna R. Gurijala ,  Brett A. Bradley ,  Ravi K. Sharma

    IPC: G10L19/02 ,  G10L19/06 ,  G10L21/04 ,  G10L19/018 ,  G10L21/043

    Abstract: Pre-processing modules are configured to compensate for time and pitch scaling and shifting and provide compensated audio frames to a watermark detector. Audio frames are adjusted for time stretching and shrinking and for pitch shifting. Detection metrics are evaluated to identify candidates to a watermark detector. Various schemes are also detailed for tracking modifications made to audio stems mixed into audio tracks, and for accessing a history of modifications for facilitating identification of audio stems and audio tracks comprised of stems. Various approaches address interference from audio overlays added to channels of audio after embedding. One approach applies informed embedding based on phase differences between corresponding components of the channels. A detector extracts the watermark payload effectively from either additive or subtractive combination of the channels because the informed embedding ensures that the watermark survives both types of processing. Other approaches applies different polarity patterns, watermark mappings, or protocol keys to the channels. These techniques enable the watermark to survive ambient mixing, conversion to mono, as well as channel differencing to reduce interference from voice-overs and other audio overlays.

    SIGNAL DECODING METHODS, APPARATUS AND SYSTEMS
    92.
    发明申请
    SIGNAL DECODING METHODS, APPARATUS AND SYSTEMS 审中-公开

    公开(公告)号：US20180374183A1

    公开(公告)日：2018-12-27

    申请号：US15934036

    申请日：2018-03-23

    Applicant: Digimarc Corporation

    Inventor： Alastair M. Reed ,  Ravi K. Sharma

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

    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.

    HARDWARE-ADAPTABLE WATERMARK SYSTEMS
    95.
    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.

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