An Invisible Watermark Detection Technique
without Using Original Images for Resolving Rightful
Ownerships of Digital Images
Wenjun Zeng and Bede Liu
Digital watermarking has been
recently proposed as the mean for copyright protection of
multimedia data. Many of existing watermarking schemes
focused on the robust means to mark an image invisibly without
really addressing the $ends$ of invisible watermarking schemes.
This paper first discusses some scenarios in which many current
watermarking schemes fail to resolve the rightful ownership of an image.
We then identify the
key problems and discuss some crucial requirements for a $valid$ invisible w
atermark detection.
In particular, we argue that,
for the particular application of resolving rightful ownership
using invisible watermarks, it might be crucial to require that
the original image not be $directly$ involved in
the watermark detection process. A general framework for validly
detecting the invisible watermarks is then proposed.
Some requirements on the claimed signature are discussed to prevent the exi
stence of any counterfeit scheme. The optimal detection strategy within the
framework is derived.
We show the effectiveness of this technique based on some visual-model-based
watermark encoding schemes.