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Thierry Pun - One of the best experts on this subject based on the ideXlab platform.

  • robust template matching for affine resistant image Watermarks
    IEEE Transactions on Image Processing, 2000
    Co-Authors: S Pereira, Thierry Pun
    Abstract:

    Digital Watermarks have been proposed as a method for discouraging illicit copying and distribution of copyrighted material. This paper describes a method for the secure and robust copyright protection of Digital images. We present an approach for embedding a Digital Watermark into an image using the Fourier transform. To this Watermark is added a template in the Fourier transform domain to render the method robust against general linear transformations. We detail a new algorithm based on polar maps for the accurate and efficient recovery of the template in an image which has undergone a general affine transformation. We also present results which demonstrate the robustness of the method against some common image processing operations such as compression, rotation, scaling, and aspect ratio changes.

  • rotation scale and translation invariant spread spectrum Digital image Watermarking
    Signal Processing, 1998
    Co-Authors: Joseph J.k.Ò. Ruanaidh, Thierry Pun
    Abstract:

    A Digital Watermark is an invisible mark embedded in a Digital image which may be used for a number of different purposes including image captioning and copyright protection. This paper describes how a combination of spread spectrum encoding of the embedded message and transform-based invariants can be used for Digital image Watermarking. In particular, it is described how a Fourier–Mellin-based approach can be used to construct Watermarks which are designed to be unaffected by any combination of rotation and scale transformations. In addition, a novel method of CDMA spread spectrum encoding is introduced which allows one to embed Watermark messages of arbitrary length and which need only a secret key for decoding. The paper also describes the usefulness of Reed Solomon error-correcting codes in this scheme.

  • rotation scale and translation invariant Digital image Watermarking
    International Conference on Image Processing, 1997
    Co-Authors: Joseph J.k.Ò. Ruanaidh, Thierry Pun
    Abstract:

    A Digital Watermark is an invisible mark embedded in a Digital image which may be used for copyright protection. This paper proposes that Fourier-Mellin transform-based invariants can be used for Digital image Watermarking. The embedded marks may be designed to be unaffected by any combination of rotation, scale and translation transformations. The original image is not required for extracting the embedded mark.

Zensho Nakao - One of the best experts on this subject based on the ideXlab platform.

  • Digital video Watermarking based on rgb color channels and principal component analysis
    International Conference on Knowledge-Based and Intelligent Information and Engineering Systems, 2008
    Co-Authors: Hanane Mirza, Hien Thai, Zensho Nakao
    Abstract:

    Embedding a Digital Watermark in an electronic document is proving to be a feasible solution for multimedia copyright protection and authentication purposes. In the present paper we propose a new Digital video Watermarking scheme based on Principal Component Analysis. We detect the video shots based on informational content, and color similarities; we extract the key frames of each shot and each key frame is composed of three color channels, and our proposed algorithm allows us to embed a Watermark in the three color channels RGB of an input video file. The preliminary results show a high robustness against most common video attacks, especially frame dropping, cropping and recalling for a good perceptual quality.

  • Digital video Watermarking based on principal component analysis
    International Conference on Innovative Computing Information and Control, 2007
    Co-Authors: Hanane Mirza, Hien Thai, Yasunori Nagata, Zensho Nakao
    Abstract:

    Embedding a Digital Watermark in an electronic document is proving to be a feasible solution for multimedia copyright protection and authentication purposes. In the present paper we propose a new Digital video Watermarking scheme based on principal component analysis. A video file is a continuous collection of static images, and each image is composed of three color channels, our proposed algorithms allow us to embed a Watermark in the three color channels RGB of an input video file. The preliminary results show a high robustness against most common video attacks, especially frame dropping, cropping and rescaling for a good perceptual quality.

  • multichannel Watermarking of color images based on principal component analysis
    한국지능시스템학회 국제학술대회 발표논문집, 2005
    Co-Authors: Kazuyoshi Miyara, Thai Duy Hien, Hanane Harrak, Zensho Nakao
    Abstract:

    In the field of image Watermarking, research has been mainly focused on gray image Watermarking, whereas the extension to the color case is usually accomplished by marking the image luminance, or by processing color channels separately. In this paper we propose a new Digital Watermarking method of three bands RGB color images based on Principal Component Analysis(PCA). This research, which is an extension of our earlier work, consists of embedding the same Digital Watermark into three RGB channels of the color image. We evaluated the effectiveness of the method against some Watermark attacks. Experimental results show that the performance of the proposed method against most prominent attacks is good.

Joseph J.k.Ò. Ruanaidh - One of the best experts on this subject based on the ideXlab platform.

  • rotation scale and translation invariant spread spectrum Digital image Watermarking
    Signal Processing, 1998
    Co-Authors: Joseph J.k.Ò. Ruanaidh, Thierry Pun
    Abstract:

    A Digital Watermark is an invisible mark embedded in a Digital image which may be used for a number of different purposes including image captioning and copyright protection. This paper describes how a combination of spread spectrum encoding of the embedded message and transform-based invariants can be used for Digital image Watermarking. In particular, it is described how a Fourier–Mellin-based approach can be used to construct Watermarks which are designed to be unaffected by any combination of rotation and scale transformations. In addition, a novel method of CDMA spread spectrum encoding is introduced which allows one to embed Watermark messages of arbitrary length and which need only a secret key for decoding. The paper also describes the usefulness of Reed Solomon error-correcting codes in this scheme.

  • rotation scale and translation invariant Digital image Watermarking
    International Conference on Image Processing, 1997
    Co-Authors: Joseph J.k.Ò. Ruanaidh, Thierry Pun
    Abstract:

    A Digital Watermark is an invisible mark embedded in a Digital image which may be used for copyright protection. This paper proposes that Fourier-Mellin transform-based invariants can be used for Digital image Watermarking. The embedded marks may be designed to be unaffected by any combination of rotation, scale and translation transformations. The original image is not required for extracting the embedded mark.

Arlindo L Oliveira - One of the best experts on this subject based on the ideXlab platform.

  • techniques for the creation of Digital Watermarks in sequential circuit designs
    IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, 2001
    Co-Authors: Arlindo L Oliveira
    Abstract:

    We present a methodology for the Watermarking of synchronous sequential circuits that makes it possible to identify the authorship of designs by imposing a Digital Watermark on the state transition graph (STG) of the circuit. The methodology is applicable to sequential designs that are made available as firm intellectual property, the designation commonly used to characterize designs specified as structural hardware description languages or circuit netlists. The Watermarking is obtained by manipulating the STG of the design in such a way as to make it exhibit a chosen property that is extremely rare in nonWatermarked circuits while, at the same time, not changing the functionality of the circuit. This manipulation is performed without ever actually computing this graph in either implicit or explicit form. Instead, the Digital Watermark is obtained by direct manipulation of the circuit description. We present evidence that no known algorithms for circuit manipulation can be used to efficiently remove or change the Watermark and that the process is immune to a variety of other attacks. We present both theoretical and experimental results that show that the Watermarking can be created and verified efficiently. We also test possible attack strategies and verify that they are inapplicable to realistic designs of medium to large complexity.

  • robust techniques for Watermarking sequential circuit designs
    Design Automation Conference, 1999
    Co-Authors: Arlindo L Oliveira
    Abstract:

    We present a methodology for the Watermarking of synchronous sequential circuits that makes it possible to identify the authorship of designs by imposing a Digital Watermark on the state transition graph of the circuit. The methodology is applicable to sequential designs that are made available as firm Intellectual Property (IP), the designation commonly used to characterize designs specified as structural descriptions or circuit netlists. The Watermarking is obtained by manipulating the state transition graph of the design in such a way as to make it exhibit a chosen property that is extremely rare in non-Watermarked circuits, while, at the same time, not changing the functionality of the circuit. This manipulation is performed without ever actually computing this graph in either implicit or explicit form. We present both theoretical and experimental results that show that the Watermarking can be created and verified efficiently.

Jiang Jie - One of the best experts on this subject based on the ideXlab platform.

  • application of level line in semi fragile Digital Watermark
    Computer Engineering, 2010
    Co-Authors: Jiang Jie
    Abstract:

    This paper presents a semi-fragile Digital Watermark algonrithm which embeds the level-line,a kind of character of image,into the Discrete Wavelet Transform(DWT)domain.By considering the masking characteristics of the Human Visual System(HVS),it solves the problem between transparency and robustness.To improve the sarety,it makes an Arnold transformation to the Watermark before embedding.it does not need the original image when extracting the Watermark,and the original Watermark is not necessary when detecting and locating tampered areas.Experimental results show that the algorithm has good invisbility and high robustness against non-malicious attacks,and it can locate the tampered areas roughly.