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AssigneeKoninklijke Philips Electronics N.V.
InventorsAntonius Adrianus Cornelis Maria Kalker, Jaap Andre Haitsma
Estimating the term…
Data is hidden in an information signal by encoding payload in to relative positions and/or polarities of multiple (possibly equal) embedded watermarks. The payload is retrieved by computing the correlation between the watermark(s) and the signal as a function of the position. The distance between peaks of the correlation function represents the payload. In order to precisely detect said distance, even if the peaks are smeared, the correlation function in a window (w1) around one peak (p1) is compared with the correlation function in a similar window (w2) around another peak (p2). This is done for different positions of said windows. The distance (k) between the windows (37,38) for which the correlation functions most resemble each other is the distance representing the payload.
A method of detecting payload data encoded into relative positions of watermarks embedded in a signal, comprising the steps of:
An apparatus for detecting payload data encoded into relative positions of watermarks embedded in a signal, comprising the steps of:
A method of detecting payload data encoded into relative polarities of watermarks embedded in a signal, comprising the steps of:
An apparatus for detecting payload data encoded into relative polarities of watermarks embedded in a signal, comprising the steps of:
Dependencies are inferred from the claim text.