System and method for on-line digital watermark detection
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United States of America Patent
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-
Mar 2, 2004
Grant Date -
N/A
app pub date -
Sep 6, 2000
filing date -
Sep 7, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To improve a reliability of watermark detection, by making it difficult for a user to falsify watermarked image. User terminal extracts the embedded watermark by using an extraction key generated by a detection center, and encrypts it by an encryption key generated by the detection center. The user terminal also encrypts by using the encryption key authentication information which is prescribed. Then, the user terminal outputs toward the detection center a first information which is a random combination of the encrypted watermark and the encrypted authentication information. The first information is decoded and quantized by the detection center. Then, the detection center transmits a second information namely the quantized first information toward the user terminal. Finally, the user terminal authenticates the watermark on the basis of the second information.
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