This paper reports the effect of printing and scanning on digital watermarks for a hard copy
image and investigates the necessary conditions for the watermark to be robust against the …

In general, a signal embedded in the low‐frequency components of an image is less likely to
be affected by attack. However, there is a problem of substantial degradation of image …

In recent years, high‐quality digital media have spread rapidly. Accompanying the diffusion
of digital media which can be simply copied and edited without deterioration of quality …

The invisibility, robustness, and capacity of watermarks are critical for data authentication.
This paper proposes a watermarking scheme taking advantage of both AC and DC …

In this paper a new watermarking algorithm for digital images operating in the frequency
domain is presented: a sequence of pseudo-random real numbers is embedded in a …

With the advance of telematic technology, increasing document image information utilized in
the state of soft copy is expected. In these situations, copies of obtained document image …

With recent advances in digital technologies, it is now possible to access digital content and
create copies easily. As a result, unauthorized copies are taken and the protection of …

A novel technique for embedding watermarks into a host image in the frequency domain is
proposed. Unlike the traditional techniques, the method addresses that the watermark is …

Due to the rising and flourishing development of network, exchange and distribution of
images become much easier and more popular. Hence, the accompanying problem is how …

Digital watermarking is one of the copyright enforcement schemes that protect copyright
ownership. It is a technique which inserts imperceptible ownership information in a given …