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Abstract

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A robust watermarking scheme for hiding binary or gray-scale

watermarks in digital images is proposed in this chapter. Motivated

by the fact that a detector response (a correlation value) only provides

a soft evidence for convincing jury in courtroom, embedded watermarks

are designed to be  visually recognizable after retrieval. To strengthen

the existence confidence of a watermark, visually significant

transformed components are selected. In addition, a relocation

technique is presented to tackle geometric-distortion-based attacks

without using any registration scheme.Finally, a semi-public

watermark detector which does not require use of the original

source is proposed for the purpose of   authentication. Experimental

results demonstrate that our approach satisfies the common

requirements of image watermarking, and that the performance

is superb.