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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...

引用

European signal processing Conference

作者： Franco Del Colle Juan Carlos Gomez Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario CIFASIS-CONICET

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 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： Measurement Watermarking Discrete wavelet transforms Image quality Wavelet domain Quality assessment Visualization

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Generating Textures for 3D Head Models: A Wavelet-Based Approach

Generating Textures for 3D Head Models: A Wavelet-Based Appr...

引用

IEEE International Conference on Image processing

作者： Silvina Ferradal Juan Carlos Gomez Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Rosario Argentina

A novel method for the automatic generation of a facial texture is proposed in this paper. Multiple pictures from the individual are combined to create the texture using a wavelet-based technique. The different tasks involved in the proposed method include: scaling, histogram equalization, deformation and merging. A set of particular feature points of the MPEG-4 standard for multimedia applications is used in the above mentioned tasks. In the merging stage, wavelet multiresolution decomposition of the images and filtering of the wavelet coefficients are performed to obtain a seamless texture. Finally, the resulting texture is mapped onto a 3D head model which has been adapted to the particular individual based on the same pictures. Since the proposed method relies on the MPEG-4 facial and body animation (FBA) standard, it can be easily integrated with applications using the same standard.

关键词： Merging Head Histograms Humans Surface texture signal generators MPEG 4 Standard Facial animation Application software Cloning

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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 ...

引用

IEEE Conference on Decision and Control

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

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.

关键词： Internet Java Control engineering education Laboratories Automatic control signal processing Communications technology Delay Economic forecasting History

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Facial motion tracking and animation: AN ICA-based approach

Facial motion tracking and animation: AN ICA-based approach

引用

European signal processing Conference (EUSIPCO)

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

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.

关键词： signal processing algorithms Face Facial animation Transform coding Tracking Avatars

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Subspace identification of multivariable hammerstein and wiener models 15th

Subspace identification of multivariable hammerstein and wie...

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15th World Congress of the International Federation of Automatic Control, 2002

作者： Gómez, Juan C. Baeyens, Enrique Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Riobamba 245 Bis Rosario2000 Argentina Department of Systems Engineering and Automatic Control ETSII Universidad de Valladolid Paseo del Cauce s/n Valladolid47011 Spain

ISBN: (纸本)9783902661746

In this paper, subspace-based algorithms for the simultaneous identification of the linear and nonlinear parts of multivariable Hammerstein and Wiener models are presented. The proposed algorithms consist basically of two steps. The first one is a standard (linear) subspace algorithm applied to an equivalent linear system whose inputs (respectively outputs) are filtered (by the nonlinear functions describing the static nonlinearities) versions of the original inputs (respectively outputs). The second step consists in a 2-norm minimization problem which is solved via a Singular Value Decomposition. Copyright © 2002 IFAC.

关键词： Singular value decomposition

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Subspace-based blind identification of IIR systems

Subspace-based blind identification of IIR systems

引用

2006 16th IEEE signal processing Society Workshop on Machine Learning for signal processing, MLSP 2006

作者： Gómez, Juan C. Baeyens, Enrique Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Riobamba 245 Bis 2000 Rosario Argentina Department of Systems Engineering and Automatic Control ETSII Universidad de Valladolid Paseo del Cauce s/n 47011 Valladolid Spain

ISBN: (纸本)1424406560

A new subspace method for the blind identification of Infinite Impulse Response (IIR), Single Input-Multiple Output (SIMO) systems represented using orthonormal bases with fixed poles, is presented in this paper. Basis coefficients are estimated in closed form, up to a scalar factor, by first computing the column space of the output Hankel matrix using Singular Value Decomposition (SVD), and then solving a Least Squares problem also resorting to an SVD. The performance of the proposed algorithm is illustrated through a simulation example. © 2006 IEEE.

关键词： Blind source separation

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Subspace-based blind identification of IIR Wiener systems

Subspace-based blind identification of IIR Wiener systems

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15th European signal processing Conference, EUSIPCO 2007

作者： Gómez, Juan C. Baeyens, Enrique Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario Riobamba 245 Bis 2000 Rosario Argentina Department of Systems Engineering and Automatic Control ETSII - Universidad de Valladolid Paseo del Cauce s/n 47011 Valladolid Spain

ISBN: (纸本)9788392134022

A new subspace method for the blind (i.e., based only on output data) identification of Single Input Single Output Wiener models is presented in this paper. The Wiener model consists of the cascade of a Linear Time Invariant (LTI) system followed by a zero-memory nonlinear element. The linear block in the Wiener model is given an Infinite Impulse Response (IIR) representation using orthonormal bases with fixed poles, while the static nonlinearity is represented using nonlinear basis functions. Basis coefficients (both of the linear and nonlinear blocks) are estimated in closed form, up to a scalar factor, by first computing the column space of an equivalent output Hankel matrix using Singular Value Decomposition (SVD), and then solving two Least Squares problems also resorting to SVDs. The performance of the proposed algorithm is illustrated through a simulation example. © 2007 EURASIP.

关键词： Singular value decomposition

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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...

引用

International Conference on signal processing and Multimedia Applications (SIGMAP)

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

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： Measurement Watermarking Discrete wavelet transforms Wavelet domain Matrix decomposition Quantization Humans

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A combined SVM/Ob-based wiener model identification method

A combined SVM/Ob-based wiener model identification method

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Universite Libre de Bruxelles

作者： Gomez, Juan C. Baeyens, Enrique Laboratory for System Dynamics and Signal Processing FCEIA Universidad Nacional de Rosario CIFASIS CONICET Riobamba 245 Bis 2000 Rosario Argentina Instituto de las Tecnologías Avanzadas de la Producción Universidad de Valladolid Paseo del Cauce 59 47011 Valladolid Spain

ISBN: (纸本)9783902823069

A novel method, combining Support Vector Machines and Least Squares Prediction Error techniques, for the identification of the linear and nonlinear blocks in a Wiener model is presented in this paper. The identification is carried out by minimizing an augmented cost function defined as the sum of the standard structural risk function appearing in Support Vector Regression and the quadratic criterion on the prediction errors associated to Least Squares estimation methods. The properties of the proposed method are illustrated through simulation examples. © 2012 IFAC.

关键词： Support vector machines

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Quantitative improvements in cDNA microarray spot segmentation

引用

4th Brazilian Symposium on Bioinformatics, BSB 2009

作者： Larese, Mónica G. Gómez, Juan Carlos Centro Internacional Franco-Argentino de Ciencias de la Informacion y de Sistemas CIFASIS-CONICET Bv. 27 de Febrero 210 Bis Rosario 2000 Argentina Laboratory for System Dynamics and Signal Processing FCEIA UNR Riobamba 245 Bis Rosario 2000 Argentina

ISBN: (纸本)3642032222

When developing a cDNA microarray experiment, the segmentation of individual spots is a crucial stage. Spot intensity measurements and gene expression ratios directly depend on the effectiveness and accuracy of the segmentation results. However, since the ground truth is unknown in microarray experiments, quantification of the accuracy of the segmentation process is a very difficult task. In this paper an improved unsupervised technique based on the combination of clustering algorithms and Markov Random Fields (MRF) is proposed to separate the foreground and background intensity signals used in the spot ratio computation. The segmentation algorithm uses one of two alternative methods to provide for initialization, namely K-means and Gaussian Mixture Models (GMM) clustering. This initial segmentation is then processed via MRF. Accuracy is measured by means of a set of microarray images containing spike spots where the target ratios are known a priori, thus making it possible to quantify the expression ratio errors. Results show improvements over state-of-the-art procedures. © 2009 Springer Berlin Heidelberg.

关键词： Gene expression

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