digital water marking using matlab
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Joined: Feb 2011
26-02-2011, 08:06 PM

I wanted to do project and implimentation on matlab,but i dont know anything.I WANT SOURCE CODE AND ALGORITHM ON DIGITAL WATER MARKING USING MATLAB.
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02-05-2011, 12:00 PM

you can refer these pages to get the details on digital watermarking and presentation-report-download and presentation-report-download?page=2 and presentation-report-download?page=3 and presentation-report-download?page=9 and presentation-report-download?page=11
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07-08-2012, 03:16 PM

Digital Watermarking Using MATLAB

.pdf   Digital Watermarking.pdf (Size: 1.45 MB / Downloads: 71)


Embedding a hidden stream of bits in a file is called Digital Watermarking. The file could be
an image, audio, video or text. Nowadays, digital watermarking has many applications such
as broadcast monitoring, owner identification, proof of ownership, transaction tracking,
content authentication, copy control, device control, and file reconstruction (Cox et. al., 2008).
In literature, the host file is called the “asset”, and the bit stream is called the “message”. The
main specifications of a watermarking system are: Robustness (Against intentional attacks
or unintentional ones such as compression), Imperceptibility, and Capacity. Importance of
each depends on the application. As a matter of fact there is a trade-off between these factors
(Barni & Bartolini, 2004). Although watermarking in some literature includes visible
imprints, here we only mean the invisible embedding of the data.

Watermarking in spectral domain

There are several transforms that brings an image into frequency domain. Among most
common of those, we can mention are: Discrete Cosines Transform (DCT) and Fast Fourier
Transform (FFT).
In frequency domain, coefficients are slightly modified. This will make some unnoticeable
changes in the whole image and makes it more robust to attack compared to what we have
in spatial methods. One of the most popular approaches in this category is the one proposed
by Cox et al which is cited by 4166 articles so far according to Google Scholar1. In this
method, discrete cosines transform (DCT) is applied on the asset image as shown in Fig. 7.


In this chapter, implementation of basic digital watermarking methods in MATLAB is
described. Fundamental methods in spatial, spectral, and hybrid domains are described and
sample codes are given. Finally, some solutions for qualifying the watermarking method are

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