G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In S. Theodoridis et al., editors, Signal processing IX, theories and applications: proceedings of Eusipco-98, Ninth European Signal Processing Conference, Rhodes, Greece, 8--11 September 1998.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....A slightly different, more appropriate notation will be used throughout the paper, with clarifications where necessary. We considered it to be benefice for us to remain faithful to our original paper [17] in this short summary. 9 the convex hull until no more points remain on the plot [27]. The number of times we were able to perform the peel off as well as the series defined by the number of points peeled off in each round is proven to be very content specific and intuitively quite change tolerant. d) Of much success in the image watermarking community, are transforms like the ....

G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In S. Theodoridis et al., editors, Signal processing IX, theories and applications: proceedings of Eusipco-98, Ninth European Signal Processing Conference, Rhodes, Greece, 8--11 September 1998.

....An important parameter in evaluating data hiding methods is hiding capacity [3] 11] 12] 16] i.e. the amount of data that a certain algorithm can hide until reaching allowable distortion limits. One fundamental difference between watermarking [4] 5] 7] 8] 9] 13] 14] 17] 18] 19] 20] [21] [22] 23] and generic data hiding resides exactly in the main applicability and descriptions of the two domains. Data hiding aims at enabling Alice and Bob Portions of this work are supported by Grants IIS 9985019, EIA 9903545 from the National Science Foundation, and by sponsors of the Center ....

G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In S. Theodoridis et al., editors, Signal processing IX, theories and applications: proceedings of Eusipco-98, Ninth European Signal Processing Conference, Rhodes, Greece, 8--11 September 1998.

....dbwm. a proof of concept implementation of our algorithm and its application on real life data, namely in watermarking data from the outsourced Wal Mart sales database of the years 1999 2000. 1 Introduction Digital watermarking has traditionally [6] 8] 9] 10] 11] 12] 18] 23] 24] [34] [36] 37] relied upon the availability of a large noise domain within which the object can be altered while retaining its essential Portions of this work were supported by Grants EIA 9903545, IIS 9985019 and IIS 9972883 from the National Science Foundation, Contract N00014 02 1 0364 from the ....

G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In S. Theodoridis et al., editors, Signal processing IX, theories and applications: proceedings of Eusipco-98, Ninth 23 European Signal Processing Conference, Rhodes, Greece, 8-11 September 1998.

....Computer Sciences Department and The Center for Education and Research in Information Assurance, Purdue University, West Lafayette, IN, 47907, USA, sion, mja, sunil] cs.purdue.edu, http: www.cs.purdue.edu homes sion Abstract. Digital Watermarking, 3] 4] 5] 6] 7] 8] 9] 11] 12] [16] [17] 18] can be summarized the technique of embedding un detectable (un perceivable) hidden information into data objects (i.e. images, audio, video, text) mainly to protect the data from unauthorized duplication and distribution by enabling provable rights over the content. In the present ....

G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In S. Theodoridis et al., editors, Signal processing IX, theories and applications: proceedings of Eusipco-98, Ninth European Signal Processing Conference, Rhodes, Greece, 8-11 September 1998, pages 9-12, Patras, Greece, 1998. Typorama Editions.

....a central element of the watermarking process we propose. We show how our approach makes use of these two value facets (structural and node content) in the case of generalized documents. 1 Introduction Digital Watermarking, in the traditional sense [12] 13] 14] 16] 17] 18] 20] 25] 26] [30] [31] 32] can be summarized as a steganographic technique embedding un detectable (un perceivable) hidden information into media objects (i.e. images, audio, video, text) mainly to protect the data from unauthorized duplication and distribution by enabling provable ownership. Whereas considerable ....

....is out of the scope here. Media Watermarking. Being one of the favorite topics in the area, media (image, audio, video) watermarking algorithms cover a wide range of representative techniques presented in numerous succesful research results and books [12] 13] 14] 16] 17] 18] 20] 25] 26] [30] [31] 32] An in depth survey of speci c techniques is out of the scope of this short document. Nevertheless we would like to point out that one common property shared among all media watermarking techniques is the fact that the nal target is almost always considered to be a human consumer. ....

G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In S. Theodoridis et al., editors, Signal processing IX, theories and applications: proceedings of Eusipco-98, Ninth European Signal Processing Conference, Rhodes, Greece, 8-11 September 1998.

....by the casual observer. Two basic directions have been followed: a) modification of cover data in the frequency domain (see, for example [5] and (b) modification of cover data in the spatial domain [2, 4, 6] Further references are given in Katzenbeisser et al. 1] and in Voyatzis et al. [8]. Most watermarking techniques applied in the spatial domain are based on the properties of the Human Visual System (HVS) Kutter et al. 4] proposed a technique that performs amplitude modulation of the blue component of the images. Moreover, commercial organizations such as Digimarc and Kodak ....

....The signature used in this example is Michalis and the PSNR measurements between the original and the watermarked image indicate PSNR= 35.188dB. Figure 2. Original Image Watermarked image Figure 3 shows another example of a typical image and the watermarked image after the insertion of the n(i) [8, 25, 98, 313, 655, 816, 1427, 1472] number of signatures (a total of 4814 signatures) The signature used in this experiment is Giannis0 and the PSNR measurements for this case indicate PSNR= 35.040dB. 3.2 ATTACKS AND RECOVERY The robustness of the proposed method was tested experimentally by the conduction of more than 500 ....

G. Voyatzis, N. Nikolaidis and I. Pitas, Digital Watermarking: An Overview, Proc. of EUSIPCO'98, September 8-11, Rhodes, Greece, 1998.

.... about the protected object (perhaps byover writing it with information about some other object) 6 Properties It is a common practice to compare the effectiveness of different watermarking schemes using metrics such as efficiency, robustness, fidelity and visibility[Miller et al. 1999, Voyatzis et al. 1998] However, as noted in the Introduction, these metrics have different meaning and desirability depending on the type of Mark being evaluated. 6.1 Efficiency There are two aspects of watermarking efficiency that need to be evaluated. These are, firstly, the computational cost involved in ....

Voyatzis, G., Nikolaidis, N., and Pitas, I. (1998). Digital watermarking: an overview. In 9th European Signal Processing Conference (EUSIPCO'98), pages 9--12, Island of Rhodes, Greece.

....into the digital media, is a popular approach considered as a tool for providing the copyright protection. The difficulty of general watermarking schemes is to balance between the invisibility and the robustness of watermark being embedded. While several watermarking algorithms have been proposed [1], transform domain schemes, such as DWT based watermarking have been shown to be much more robust and also have greater invisibility than others [2] 3] 4] To preserve the perceptual invisibility of watermark, some of the algorithms have been designed to embed watermark in the lower level ....

G. Voyatzis, N. Nikolaidis and I. Pitas, "Digital watermarking: An overview," EUSIPCO-98, Greece, Sept. 1998, vol. 1, pp. 9-12.

....private information in such a way that the third parties (unauthorized person) cannot detect or even notice the presence of the communication. In this way, steganography allows for authentication, copyright protection, and embedding of messages in the image or in transmission of the image [1][2]. Most of the existing steganographic algorithms are performed in pixel domain as it provides more embedding space (capacity) reliability and controllability in encoding decoding of the hidden message. On the other hand, due to the risk of losing embedded data, embedding information in the ....

G. Voyatzis et al., "Digital watermarking: an overview," EUSIPCO, vol. 1, pp. 9-12, 1998.

....embedding can be considered as a superposition of the watermark signal on the original image. Finally, watermark detection is usually performed using watermark correlators or hypothesis testing. For a more detailed discussion of the general watermarking framework the interested reader can consult [2, 3]. 2.1. Taxonomy Watermarking techniques can be categorized in a number of classes on the basis of their distinct features. A number of watermarking techniques require that the original image is available during the detection phase. Such schemes are sometimes referred to as private schemes or ....

G. Voyatzis, N. Nikolaidis and I. Pitas, "Digital Watermarking: An Overview", IX European Signal Processing Conference (EUSIPCO'98), vol. I, pp. 9-12, September 1998

....should be satisfied : D(Xw ; W ) 1 ) D(X 0 w ; W ) 1 The above scheme provides efficient security to various intentional attacks (see e.g. 8] like generation of counterfeit watermarks, statistical watermark extraction, multiple ownership claims, taking advantage of false positives etc. [5]. 3 Watermark generation We consider an one dimensional (1D) discrete map F : U U; U ae IR, which provides sequences of real numbers (trajectories) z(n 1) F(z(n) z(n) 2 U; 2 IR (5) where n = 0; 1; 2; denotes map iterations and is a control parameter (or a set of parameters) ....

G. Voyatzis, N.Nikolaidis and I.Pitas, "Digital Watermarking: An Overview", Proceedings of EUSIPCO'98, to appear, 1998.

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G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In S. Theodoridis et al., editors, Signal processing IX, theories and applications: proceedings of Eusipco-98, Ninth European Signal Processing Conference, Rhodes, Greece, 8--11 September 1998.

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G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In 9th European Signal Processing Conference (EUSIPCO'98), pages 9-12, Island of Rhodes, Greece, 8-11 September 1998. ISBN 960-7620-05-4.

No context found.

G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In 9th European Signal Processing Conference { EUSIPCO '98, pages 9-12, Island of Rhodes, Greece, September 1998. ISBN 960-7620-05-4.

No context found.

G. Voyatzis, N. Nikolaidis, and I. Pitas. Digital watermarking: an overview. In 9th European Signal Processing Conference (EUSIPCO'98), pages 9--12, Island of Rhodes, Greece, 8--11 September 1998. ISBN 960-7620-05-4.

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