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Digital watermarking has been proposed as a viable solution
to the need of copyright protection and authentication
of multimedia data in a networked environment, since
it makes possible to identify the author, owner, distributor
or authorized consumer of a document. In this paper a new
watermarking technique to add a code to digital images is
presented: the method operates in the frequency domain
embedding a pseudo-random sequence of real numbers in a
selected set of DCT coefficients. Watermark casting is performed
by exploiting the masking characteristics of the Human
Visual System, to ensure watermark invisibilily. The
embedded sequence is extracted without resorting to the
original image, so that the proposed technique represents
a major improvement to methods relying on the comparison
between the watermarked and original images. Experimental
results demonstrate that the watermark is robust to
most of the signal processing techniques and geometric distortions.
Index Terms: DCT, watermark, watermark casting, watermark detection, digital watermarking,
copyright.
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Figure 1. Watermarked image |
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A simple and effective source code for Digital watermarking. |
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Demo code (protected
P-files) available for performance evaluation. Matlab Image Processing Toolbox is required. |
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Release |
Date |
Major features |
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1.0 |
2005.08.06 |
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We recommend to check the secure connection to PayPal, in order to avoid any fraud. This donation has to be considered an encouragement to improve the code itself. |
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DCT-based Watermarking. Click here for
your donation. In order to obtain the source code you
have to pay a little sum of money: 39,90 EUROS (less
than 55,86 U.S. Dollars). |
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Once you have done this, please email us luigi.rosa@tiscali.it As soon as possible (in a few days) you will receive our new release of DCT-based Watermarking. Alternatively, you can bestow using our banking coordinates:
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The authors have no relationship or partnership
with The Mathworks. All the code provided is written in Matlab
language (M-files and/or M-functions), with no dll or other
protected parts of code (P-files or executables). The code was
developed with Matlab 14 SP1. Matlab Image Processing Toolbox is required.
The code provided has to be considered "as is" and it is without any kind of warranty. The
authors deny any kind of warranty concerning the code as well
as any kind of responsibility for problems and damages which may
be caused by the use of the code itself including all parts of
the source code.
