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    Method for an encrypted digital watermark
    1.
    发明专利
    Method for an encrypted digital watermark 未知

    公开(公告)号：AU1829597A

    公开(公告)日：1997-08-11

    申请号：AU1829597

    申请日：1997-01-16

    Applicant: DICE COMPANY

    Inventor： COOPERMAN MARC ,  MOSKOWITZ SCOTT A

    IPC: G06T1/00 ,  H04L9/32 ,  H04L9/00

    Abstract: A method for applying a digital watermark to a content signal is disclosed. In accordance with such a method, a watermarking key is identified. The watermarking key includes a binary sequence and information describing application of that binary sequence to the content signal. The digital watermark is then encoded within the content signal at one or more locations determined by the watermarking key.

    Optimization methods for the insertion, protection and detection of digital watermarks in digitized data
    2.
    发明专利
    Optimization methods for the insertion, protection and detection of digital watermarks in digitized data 未知

    公开(公告)号：AU3588197A

    公开(公告)日：1998-02-09

    申请号：AU3588197

    申请日：1997-07-02

    Applicant: DICE COMPANY

    Inventor： MOSKOWITZ SCOTT A ,  COOPERMAN MARC S

    IPC: H04L9/32 ,  G09C5/00 ,  H04L9/00

    Abstract: Disclosed herein are methods and systems for encoding digital watermarks into content signals. Also disclosed are systems and methods for detecting and/or verifying digital watermarks in content signals. According to one embodiment, a system for encoding of digital watermark information includes: a window identifier for identifying a sample window in the signal; an interval calculator for determining a quantization interval of the sample window; and a sampler for normalizing the sample window to provide normalized samples. According to another embodiment, a system for pre-analyzing a digital signal for encoding at least one digital watermark using a digital filter is disclosed. According to another embodiment, a method for pre-analyzing a digital signal for encoding digital watermarks comprises: (1) providing a digital signal; (2) providing a digital filter to be applied to the digital signal; and (3) identifying an area of the digital signal that will be affected by the digital filter based on at least one measurable difference between the digital signal and a counterpart of the digital signal selected from the group consisting of the digital signal as transmitted, the digital signal as stored in a medium, and the digital signal as played backed. According to another embodiment, a method for encoding a watermark in a content signal includes the steps of (1) splitting a watermark bit stream; and (2) encoding at least half of the watermark bit stream in the content signal using inverted instances of the watermark bit stream. Other methods and systems for encoding/decoding digital watermarks are also disclosed.

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