A novel image protection scheme named "cocktailwatermarking" improves over current spread-spectrumwatermarking approaches. Two watermarks, which playcomplementary roles, are simultaneously embedded into anoriginal image. The new watermarking scheme has thecharacteristic that, no matter what an attack is, at leastone watermark typically survives well and can be detected.Results of extensive experiments indicate that our cocktailwatermarking scheme is effective in resisting variousattacks.
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