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Signal continuity assessment using embedded watermarks

  • US 9,990,688 B2
  • Filed: 07/10/2017
  • Issued: 06/05/2018
  • Est. Priority Date: 10/08/2003
  • Status: Expired due to Term
First Claim
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1. A method for detecting a change in arrangement of segments of a multimedia content, comprising:

  • receiving a multimedia content at a multimedia reception device equipped with a watermark extractor, the multimedia content including a plurality of watermark messages embedded therein;

    extracting the plurality of watermark messages using the watermark extractor that is implemented at least partially in electronic circuits, wherein;

    each embedded watermark message spans a predetermined length or duration of the multimedia content,each of the plurality of watermark messages, in absence of content manipulations, is nominally separated from another embedded watermark message by a predetermined separation value that is either equal to the predetermined length or duration, or is an integer multiple of the predetermined length or duration,the received multimedia content includes at least one content manipulation that causes an actual separation of a first one of the plurality of watermark messages from a second one of the plurality of watermark messages to deviate from the predetermined separation value by an offset value; and

    determining that the at least one content manipulation has occurred by comparing the offset value to a threshold offset value.

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