Abstract
Many image watermarks have been proposed
to protect intellectual property in an age
where digital images may be easily modified
and perfectly reproduced. In a fragile marking
system, a signal (watermark) is embedded
within an image such that subsequent alterations
to the watermarked image can be detected
with high probability. The insertion of
the watermark is perceptually invisible under
normal human observation. These types of
marks have found applicability in image
authentication systems.
In this paper we discuss fragile marking
systems and their desirable features, common
methods of attack, and survey some recent
marking systems.
