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Fidelity and robustness analysis of image adaptive DWT-based watermarking schemes

Fidelity and robustness analysis of image adaptive DWT-based...

引用

SIGMAP 2007 - International Conference on signal processing and Multimedia Applications

作者： Colle, Franco Del Gómez, Juan Carlos Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Argentina

An Image Adaptive Watermarking method based on the Discrete Wavelet Transform is presented in this paper. The robustness and fidelity of the proposed method are evaluated and the method is compared to state-of-the-art watermarking techniques available in the literature. For the evaluation of watermark transparency, an image fidelity factor based on a perceptual distortion metric is introduced. This new metric allows a perceptually aware objective quantification of image fidelity.

关键词： Discrete wavelet transforms

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Subjective verification of perceptual metrics for Image Watermarking fidelity

Subjective verification of perceptual metrics for Image Wate...

引用

SIGMAP 2008 - International Conference on signal processing and Multimedia Applications

作者： Colle, Franco Del Gómez, Juan Carlos Laboratory for System Dynamics and Signal Processing FCEIA Universidad National de Rosario Argentina CIFASIS CONICET

ISBN: (纸本)9789898111609

In this paper, the performance of several state-of-the-art watermark perceptual transparency metrics is evaluated through subjective assessment. Simulation results show that a metric based on S-CIELAB distortion maps proved to be better correlated to the subjective tests than other objective metrics available in the literature. The paper focus on Image Adaptive Watermarking methods in the Discrete Wavelet Transform Domain since they yield better results regarding robustness and transparency than other watermarking schemes.

关键词： Discrete wavelet transforms

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Online signature verification: Improving performance through pre-classification based on global features

Online signature verification: Improving performance through...

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17th International Conference on Image Analysis and processing, ICIAP 2013

作者： Parodi, Marianela Gómez, Juan Carlos Lab. for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Argentina

ISBN: (纸本)9783642411892

In this paper, a pre-classification stage based on global features is incorporated to an online signature verification system for the purposes of improving its performance. The pre-classifier makes use of the discriminative power of some global features to discard (by declaring them as forgeries) those signatures for which the associated global feature is far away from its respective mean. For the remaining signatures, features based on a wavelet approximation of the time functions associated with the signing process, are extracted, and a Random Forest based classification is performed. The experimental results show that the proposed pre-classification approach, when based on the apppropriate global feature, is capable of getting error rate improvements with respect to the case where no pre-classification is performed. The approach also has the advantages of simplifying and speeding up the verification process. © 2013 Springer-Verlag.

关键词： Classification (of information)

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A DWT-SVD based perceptual image fidelity metric for watermaking schemes

A DWT-SVD based perceptual image fidelity metric for waterma...

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作者： Del Colle, Franco Gómez, Juan Carlos Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Rosario Argentina

ISBN: (纸本)9789898425195

In this paper, a novel DWT-SVD perceptual fidelity metric for the evaluation of watermarking schemes is introduced. The proposed metric is based on a widely used Human Visual Model in the Discrete Wavelet Transform domain accounting for the frequency sensitivity, and the local luminance and contrast masking effects of the human eye. A relationship between the visual model in the DWT domain and the modification of the wavelet coefficients's singular values is derived. The proposed metric is validated through subjective assessment and its performance is compared to several state-of-the-art perceptual image distortion metrics. The paper focus on Image Adaptive Watermarking methods in the Discrete Wavelet Transform Domain since they yield better results regarding robustness and transparency than other watermarking schemes.

关键词： Discrete wavelet transforms

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Facial motion tracking and animation: An ICA-based approach

Facial motion tracking and animation: An ICA-based approach

引用

15th European signal processing Conference, EUSIPCO 2007

作者： Terissi, Lucas D. Gómez, Juan C. Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Riobamba 245 Bis 2000 Rosario Argentina

ISBN: (纸本)9788392134022

Algorithms for facial motion tracking and animation of avatars based on video sequences of a real person are presented in this paper. The tracking algorithm is based on image processing techniques and Independent Component Analysis (ICA), while the animation algorithm is based on Facial Animation Parameters of the MPEG-4 standard. Simulation results illustrating the performance of the proposed algorithms are also included in this paper. © 2007 EURASIP.

关键词： Independent component analysis

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ICT tools in a signals and systems course at the University of Rosario

ICT tools in a signals and systems course at the University ...

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44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05

作者： Gómez, Juan Carlos Ferradal, Silvina Del Colle, Franco Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Riobamba 245 Bis 2000 Rosario Argentina

ISBN: (纸本)0780395689

In this paper, the use of Information and Communications Technologies (ICT) tools in a course on signals and systems at the University of Rosario is described. The course is now in its sixth year. The format of the course as well as the ICT resources employed as a support for the lectures and laboratories are described. The use of these new technologies has proved to increase the level of students' participation and the students' satisfaction rate with the course. Some ongoing projects are also presented in this paper. © 2005 IEEE.

关键词： Information technology

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A new DWT-SVD based perceptual fidelity metric for quality assessment of watermaking schemes

A new DWT-SVD based perceptual fidelity metric for quality a...

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18th European signal processing Conference, EUSIPCO 2010

作者： Del Colle, Franco Ǵomez, Juan Carlos Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario CIFASIS-CONICET Riobamba 245 Bis 2000 Rosario Argentina

A new DWT-SVD perceptual fidelity metric for the evaluation of watermarking schemes is introduced in this paper. A widely used Human Visual Model in the Discrete Wavelet Transform domain is employed by the metric to account for the frequency sensitivity, and the local luminance and contrast masking effects of the human eye. A relationship between the visual model in the DWT domain and the modification of the wavelet coefficients singular values is derived. Subjective experiments are used to validate the proposed metric, and its performance is compared to several state-of-the-art perceptual image distortion metrics. The paper focuses on Image AdaptiveWatermarking methods in the Discrete Wavelet Transform Domain since they yield better results regarding robustness and transparency than other watermarking schemes. © EURASIP, 2010.

关键词： Discrete wavelet transforms

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Online signature verification based on legendre series representation. Consistency analysis of different feature combinations

Online signature verification based on legendre series repre...

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17th Iberoamerican Congress on Progress in Pattern Recognition, Image Analysis, Computer Vision, and Applications, CIARP 2012

作者： Parodi, Marianela Gómez, Juan Carlos Laboratory for System Dynamics and Signal Processing Universidad Nacional de Rosario CONICET Argentina

ISBN: (纸本)9783642332746

In this paper, orthogonal polynomial series are used to approximate the time functions associated to the signatures and the coefficients in these series are used as features to model them. A novel consistency factor is proposed to quantify the discriminative power of different combinations of time functions related to the signing process. Pen coordinates, incremental variation of pen coordinates and pen pressure are analyzed for two different signature styles, namely, Western signatures and Chinese signatures from a publicly available Signature Database. Two state-of-the-art classifiers, namely, Support Vector Machines and Random Forests are used in the verification experiments. The obtained error rates are comparable to results reported over the same signature datasets in a recent signature verification competition. © 2012 Springer-Verlag.

关键词： Orthogonal functions

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Class confusability reduction in audio-visual speech recognition using random forests 22nd

Class confusability reduction in audio-visual speech recogni...

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22nd Iberoamerican Congress on Pattern Recognition, CIARP 2017

作者： Sad, Gonzalo D. Terissi, Lucas D. Gómez, Juan C. Laboratory for System Dynamics and Signal Processing Universidad Nacional de Rosario CIFASIS-CONICET Rosario Argentina

ISBN: (纸本)9783319751924

This paper presents an audio-visual speech classification system based on Random Forests classifiers, aiming to reduce the intra-class misclassification problems, which is a very usual situation, specially in speech recognition tasks. A novel training procedure is proposed, introducing the concept of Complementary Random Forests (CRF) classifiers. Experimental results over three audio-visual databases, show that a good performance is achieved with the proposed system for the different types of input information considered, viz., audio-only information, video-only information and fused audio-video information. In addition, these results also indicate that the proposed method performs satisfactorily over the three databases using the same configuration parameters. © Springer International Publishing AG, part of Springer Nature 2018.

关键词： Decision trees

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A Graphical User Interface for Automatic Facial Texture Mapping Based on Orthogonal Photos

A Graphical User Interface for Automatic Facial Texture Mapp...

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International Conference on Multimedia Modeling (MMM)

作者： S.L. Ferradal J.C. Gomez Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Rosario Argentina Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Rosario Argentina

In this paper, a Graphical User Interface for the automatic generation of a facial texture mapping from three orthogonal photos is presented. The proposed method is based on the composition of the two side views (previously deformed) and the front view. The deformation is performed using a set of particular FDP (Facial Definition Points) of the MPEG-4 standard for multimedia applications. To smooth out the boundaries caused by the merging of the orthogonal views, a wavelet-based multiresolution filtering technique is employed. This work is the first stage in the development of a toolbox for automatic facial cloning.

关键词： Graphical user interfaces Head Cloning Humans Surface texture MPEG 4 Standard Merging Solid modeling Skin Deformable models

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