dwprotected
所属分类:图形图像处理
开发工具:matlab
文件大小:95KB
下载次数:5
上传日期:2013-04-20 19:46:49
上 传 者:
topsecret90
说明: Watermarking using DCT
文件列表:
dwprotected\prova.m (4310, 2012-10-30)
dwprotected\v17.jpg (84956, 2002-07-10)
dwprotected\wm_casting.p (9521, 2005-08-06)
dwprotected\wm_detection.p (6451, 2005-08-06)
dwprotected (0, 2013-03-06)
Copy all files in Matlab current directory and type "prova" (the main file) on Matlab
command window. You can change simulation parameters present in this main file.
See the cited article (see below) for more details.
DCT-based image watermarking
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 coeficients. 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.
Requirements:
Matlab, Matlab Image Processing Toolbox
For the complete source code please visit
http://www.advancedsourcecode.com/dctwater.asp
References
A. Piva, M. Barni, F. Bartolini, and V. Cappellini,
"DCT-based watermark recovering without restoring
to the uncorrupted original image", in International
Conference on Image Processing, vol. 111, pp. 520-523, 1997.
This article is available at
http://www.tsi.enst.fr/~maitre/tatouage/icip97/piva-97.pdf
For more information please email me luigi.rosa@tiscali.it
Luigi ROSA
Via Centrale 35
67042 Civiata Di Bagno
L'Aquila - ITALY
mobile +39 3207214179
email luigi.rosa@tiscali.it
website http://www.advancedsourcecode.com
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