This paper describes a speech and text translator from Spanish into Spanish Sign Language, that tries to
solve some of the problems that deaf people find when they access and attend specific training courses. In
addition to the translator system, a set of real-time avatar animations representing the signs are used. The
creation process of such avatars is also described. The system can be used...
ARTEC-Articulo
watercraft. This paper presents an experimental characterization of a speed-boat in order to understand the
nature and magnitude of a typical small watercraft motion. Unlike other studies, this work focuses on realtime
simulation instead of on boat design issues. The purpose of the study is to guide the future process of
designing and parameterizing a suitable motion platform for a VR...
ARTEC-Articulo
In this paper an Augmented Reality system for teaching key developmental abilities for individuals with
ASD is described. The system has been designed as an augmented mirror where users can see themselves in
a mirror world augmented with virtual objects. Regarding the content the tool is designed with the aim of
facilitating the acquisition of certain skills in children with ASD. From a...
ARTEC-Articulo
Training necessities on watercraft have increased during the last few years and real-time simulators offer a
suitable and safe alternative. However, the design of a real-time watercraft simulator implies that, water
simulation and water-vehicle interaction have to be addressed efficiently. This paper presents a simplified
physics model of the water-vehicle interaction for real-time speed-boat...
ARTEC-Articulo
The use of authoring tools has become a valuable trend for the fast development of Augmented Reality (AR)
applications in industrial organizations. However, most of current AR authoring tools are actually programming
interfaces that are exclusively suitable for programmers. Moreover, they do not provide advanced visual
effects, such as occlusion or object collision detection, to the resulting...
ARTEC-Articulo
Se realiza un estudio de un sistema LTE-Advanced de 4G (aún en evolución y desarrollo), sobre sistemas coordinados (cooperación) y sistemas distribuidos para ver como reacciona el sistema ante diversas características como multiusuario, multiantena y macrocelda.
Final degree Project-GSIC
En la actualidad, los museos y salas de exposiciones buscan nuevas formas de mostrar al público sus colecciones de una manera más atractiva. Para ello, emplean nuevas tecnologías como la realidad aumentada, que permiten involucrar activamente al público de forma física, intelectual y social. En este artículo se presenta el diseño y la puesta en funcionamiento de un sistema de realidad aumentada...
ARTEC-Articulo
In this paper, we obtain approximations for the optimal Log-Likelihood Ratio (LLR) decision rule in cooperative detection when local energy detectors are assumed. Considering conditional independence, we also show under which bandwidth and sampling frequency regimes these approximations hold best. Furthermore, we present simulations where the performance of the approximated LLR decision rule is...
Articulo-GSIC
In this paper, we consider the distributed training of a SVM using measurements collected by the nodes of a Wireless Sensor Network in order to achieve global consensus with the minimum possible inter-node communications for data exchange. We derive a novel mathematical characterization for the optimal selection of partial information that neighboring sensors should exchange in order to achieve...
Articulo-GSIC
The AugmenTable is a desktop augmented reality workstation intended for conceptual design and prototyping. It combines a thin form factor display, inexpensive web cameras, and a PC into a unique system that enables natural interaction with virtual and physical parts. This initial implementation of the AugmenTable takes advantage of the popular open source augmented reality software platform...
ARTEC-Articulo
Presentamos en este artículo un sistema de interacción basado en Realidad Aumentada que permite conversar a un personaje virtual controlado por un actor en tiempo real con el público asistente a través de una pantalla de gran formato a modo de espejo aumentado. El sistema integra imágenes de vídeo reales con las imágenes virtuales del avatar y otros objetos animados incorporados como apoyo a la...
ARTEC-Articulo
In this paper we present a virtual character controlled by an actor in real time, who talks with an audience through an augmented mirror. The application, which integrates video images, the avatar and other virtual objects within an Augmented Reality system, has been implemented using a mixture of technologies: two kinect systems for motion capture, depth map and real images, a gyroscope to...
ARTEC-Articulo
Over the last years, museums and galleries are looking for new ways to show exhibitions to visitors. For that purpose, new technologies like augmented reality are used. In this paper an augmented reality system for indoor exhibitions is presented. The system is formed by visualization screens that mix exhibition environment, visitors included, with multimedia and virtual 3D objects which visitors...
ARTEC-Articulo
Published on the book: Augmented Reality, some emerging application areas, ISBN: 978-953-307-422-1. ---
In this work, key aspects of AR in construction sites are faced and a construction AR aided inspecting system is proposed and tested. Real world would appear in the background with the construction plans superimposed, allowing users not only to inspect all the visible elements of a given...
ARTEC-Articulo
En la actualidad, los museos y salas de exposiciones buscan nuevas formas de mostrar al público sus colecciones de una manera más atractiva. Para ello, emplean nuevas tecnologías como la realidad aumentada, que permiten involucrar activamente al público de forma física, intelectual y social. En este artículo se presenta el diseño y la puesta en funcionamiento de un sistema de realidad aumentada...
ARTEC-Articulo
PROC OF ISC. 2010.
Articulo-LSYM
SCA '10: Proceedings of the 2010 ACM SIGGRAPH/Eurographics Symposium on Computer Animation 2010
Articulo-LSYM
The setting out is the first step of construction of any building. This complex task used to be performed by means of specialized and expensive surveying equipment in order to minimize the deviation of the constructed areas from the information provided by design plans. This paper presents a new low-cost system oriented to the management of setting out in construction sites based on Augmented...
ARTEC-Articulo
SAFAR is a mobile Augmented Reality application that makes possible to see in real-time the ‘Sagrada Familia’ as it will look like when it be finished. The application successfully integrates outdoor tracking and 3D rendering processes to provide an augmented view of this under construction monument to city travellers, equipped with Nokia mobile phones. This outdoor tracking process includes a...
ARTEC-Articulo
Descripción de los simuladores marítimos desarrollados para FOREM-A.
ARTEC-Articulo
El sistema que presentamos fue exhibido en Valencia en la iniciativa DIGITAL MEDIA 1.0 y consiste en un proyecto experimental de Realidad Aumentada donde el usuario utiliza sus movimientos sobre el juego infantil de la rayuela como sistema de interacción. SAMBORI ofrece un sistema que realiza una intervención del espacio, permitiendo al usuario sumergirse en un mundo real aumentado, con el que...
ARTEC-Articulo
We study the source coding problem in sensor networks deployed to monitor the evolution of spatio-temporal temperature distributions. The sensors sample the temperature field, quantize the samples and transmit the encoded samples through digital channels to some central unit, which computes an estimate of the original temperature field. Our analysis is based on the heat kernel's spectral...
Articulo-GSIC
In this paper, we show how to critically sparsify a given network while improving the convergence rate of the associated average consensus algorithm. Thus, instead of adding new links or reallocating them, we propose novel distributed methods to nd much sparser networks with better convergence results than the original denser ones. We propose two distributed algorithms; a) in the first one,...
Articulo-GSIC
In this paper, we consider the problem of improving the convergence speed of an average consensus gossip algorithm by sparsifying a sufficiently dense network graph. Thus, instead of adding links, as usually proposed in the literature, or globally optimizing the mixing matrix of the gossip algorithm for a given network, which requires global knowledge at every node, we find a sparser network that...
Articulo-GSIC
El propósito de este trabajo consiste en el análisis, diseño, construcción y evaluación de un sistema tipo mesa interactiva basado en tecnología de pantalla “Multi-Táctil”. Concretamente, este trabajo se centra tanto en el diseño y construcción del subsistema hardware del sistema (la propia mesa en sí), como en el análisis, diseño e implementación del subsistema software del mismo. Además de esto...
ARTEC-Proyecto final de carrera
CEIG’09. 2009.
Articulo-LSYM
Utilizando el Software desarrollado, llamado BIOMIMO estudio ergonómico aumentado, un experto puede observar al usuario durante el estudio, obteniendo una visualización aumentada del mismo. Para aumentar la visión del experto, el sistema de captura infrarrojo de alta precisión envía la información que se representan en forma de un esqueleto tridimensional superpuesto a la imagen del sujeto...
ARTEC-Articulo
The user interaction in mobile phones has been traditionally based on key behaviors that users have adapted around their mobile devices.
Although this type of interaction could be suitable for some contents, it could be improved from the point of view of the usability.
In this paper we present a new user interface based on 3D navigation oriented to mobile phones. To enhance the user experience...
ARTEC-Articulo
En este trabajo presentamos un sistema para la navegación en entornos virtuales 3D sobre teléfonos móviles. Tradicionalmente la interacción
con el teléfono móvil se ha realizado utilizando el teclado como dispositivo de interacción. Sin embargo, gracias a las capacidades de los nuevos terminales es posible aprovechar dispositivos como la cámara incorporada o los acelerómetros para implementar...
ARTEC-Articulo
In the present paper a system architecture for the combination, interaction and synchronization between different technologies is presented. Our system integrates 3D interactive virtual environments, 2D animations and games, avatars, form applications and documents, videos based in Chroma Key technology and other multimedia components. All of this inside a unique web application with a special...
ARTEC-Articulo
EATIS2009 THE FOURTH EUROAMERICAN CONFERENCE ON TELEMATICS AND INFORMATION SYSTEMS .ISBN #978-1-60558-398-3 ACM-DL-Proceedings
Articulo-LISITT
The authors consider a Wireless Sensor Network (WSN) deployed over a large geographical area, where a querying node wishes to perform a estimation of a localized phenomenon. The authors formulate the problem as a joint optimization of sensor selection and routing structure where they minimize the estimation distortion subject to a total communication power constraint for the WSN. Two scenarios...
Articulo-GSIC
Eurographics 2008 - Short Papers, 21-24. 2008
Articulo-LSYM
“BIOMIMO Design & Test” is a software
application to aid the process of designing and testing IADs
(Intelligent Assist Devices), also known as orthoses, developed
by the Ikerlan technology centre. This software combines
Augmented Reality (AR), Virtual Reality (VR) and videobased
optical motion capture techniques in order to evaluate a
prototype without actually constructing it, and to...
ARTEC-Articulo
En este artículo se describe la inclusión de técnicas de captura de movimiento ópticas para el diseño y evaluación de un prototipo de ortesis. Las técnicas aplicadas son de dos tipos: basadas en infrarrojos para la captura de movimientos del usuario en el estudio de patrones de movimiento para el diseño de la ortesis; y basadas en vídeo para la evaluación de los algoritmos de control sobre el...
ARTEC-Articulo
SCA '08: Proceedings of the 2008 ACM SIGGRAPH/Eurographics Symposium on Computer Animation 2008, 1-10
Articulo-LSYM
The test of wearable robots with users can be dangerous, especially initially, when the control algorithms and the controller are tested. The use of virtual prototypes, as opposed to creating real ones, whilst not eliminating the need to manufacture an ultimate prototype for the final tests, eliminates intermediate tests which could potentially be dangerous for a user. Multi-modal interaction and...
ARTEC-Articulo
Aplicación para dispositivos móviles programada en Java, concretamente sobre la plataforma J2ME (MicroEdition) cuya finalidad es la recopilación de toda la información que podemos encontrar cuando sucede un incidente de tráfico. La principal ventaja de utilizar un dispositivo móvil, como por ejemplo un teléfono móvil, es que podemos usar las características multimedia (cámara de fotos, video, GPS...
ARTEC-Proyecto final de carrera
CONGRESO: EATIS2008 THE THIRD EUROAMERICAN CONFERENCE ON TELEMATICS AND INFORMATION SYSTEMS (EATIS2008 ARACAJU, BRASIL).ISBN #978-1-59593-988-3
Articulo-LISITT
Martinez JOURNAL OF NETWORKS (JNW), ISSN : 1796-2056. Volume : 3 Issue : 1 Date : January 2008. Page(s): 35-42 References: http://www.academypublisher.com/jnw/vol03/no01/jnw03013542.pdf Edita: JOURNAL OF NETWORKS (JNW). ISSN : 1796-2056, Number of issues per year : 12, Number of papers per issue : 6, Page Size : 60 pages
Articulo-LISITT
DO NASCIMENTO Revista (indicar nombre): IEEE Transactions on Knowledge and Data Engineering, IEEE Computer Society Digital Library. IEEE Computer Society, ISSN: 1041-4347Vol.: 20, January 2008 Pag, 130-134 < http://doi.ieeecomputersociety.org/10.1109/TKDE.2007.190698 >
Articulo-LISITT
This paper addresses the construction of a novel efficient rotation-invariant texture retrieval method that is based on the alignment in angle of signatures obtained via a steerable sub-Gaussian model. In our proposed scheme, we first construct a steerable multivariate sub-Gaussian model, where the fractional lower-order moments of a given image are associated with those of its rotated versions....
Articulo-GSIC
This paper studies coordination and consensus mechanisms for Wireless sensor networks in order to train a Support Vector Machine (SVM) classifier in a distributed fashion. We propose two selective gossip algorithms, which take advantage of the sparse representation that SVMs provide for their decision boundary (hyperplane), in order to ensure convergence to an optimal or close-to-optimal...
Articulo-GSIC
Virtual and Augmented Reality have been widely used in many scientific fields for the last two decades in order to visualize complex data and information. Although both techniques are oriented to show users complex 3D environments by means of an intuitive and easy mechanism, they use to become useless to manipulate the information in an intuitive and realistic way. In this
paper, we present...
ARTEC-Articulo
La captura de movimiento (MoCap) es una tecnología joven y creciente, que cada vez es más utilizada como método de interacción con el ordenador. Existen multitud de tecnologías para realizar este proceso, cada una con sus ventajas y desventajas.
La principal desventaja de los sistemas de captura, viene determinada en la mayoría de los casos por su alto precio. Hasta el momento los sistemas MoCap...
ARTEC-Investigacion
AIP Conference Proceedings, AIP 2007, 212-215
Articulo-LSYM
International e-Conference on Computer Science. Proceedings of the IeCCS2007 2007
Articulo-LSYM
Proceedings of the Industrial Simulation Conference 2007, 64-68
Articulo-LSYM
Sistema para diseño y evaluación de trazados de carreteras utilizando tecnologías de visualización inmersiva.
ARTEC-Articulo
Presentación de un simulador de conducción de vehículos multipuesto.
ARTEC-Articulo
The standard separable 2-D wavelet transform (WT) has recently achieved a great success in image processing because it provides a sparse representation of smooth images. However, it fails to efficiently capture 1-D discontinuities, like edges or contours. These features, being elongated and characterized by geometrical regularity along different directions, intersect and generate many large...
Articulo-GSIC
In our previous work we proposed a construction of critically sampled perfect reconstruction transforms with directional vanishing moments (DVMs) imposed in the corresponding basis functions along different directions, called directionlets. Here, we combine the directionlets with the space-frequency quantization (SFQ) image compression method, originally based on the standard two-dimensional (2-D...
Articulo-GSIC
La necesidad de instrucción y evaluación de procedimientos de salvamento marítimo y la imposibilidad de realizar estas tareas en condiciones reales, se puede resolver mediante el uso de técnicas de simulación inmersiva. Este es el caso del entorno ENSISAM, donde además de utilizar técnicas avanzadas de simulación gráfica en tiempo real, se han desarrollado y aplicado elementos de interacción...
ARTEC-Articulo
Research and practice have demonstrated that both visual and computer mediation of learning is very facilitatory in autism spectrum disorders (ASD). Virtual Reality (VR) has extended and enhanced those benefits but still leaves some more severely affected individuals unable to generalise their learning to new situations. Augmented Reality (AR) Technologies offer new opportunities for providing...
ARTEC-Articulo
Lecture Notes on Computer Science, 2006, 4173, 392-401
Articulo-LSYM
Herramienta VALLE para el diseño de estructuras viarias y carreteras el apoyo de las técnicas de visualización 3D.
ARTEC-Articulo
Herramienta VALLE para la visualización interactiva de carreteras.
ARTEC-Articulo
Herramienta para el diseño de experimento en simulación de conducción.
ARTEC-Articulo
We consider the problem of correlated data gathering by a network with a sink node and a tree-based communication structure, where the goal is to minimize the total transmission cost of transporting the information collected by the nodes, to the sink node. For source coding of correlated data, we consider a joint entropy-based coding model with explicit communication where coding is simple and...
Article-GSIC
We study the problem of A/D conversion and error-rate dependence of a class of nonbandlimited signals with finite rate of innovation. In particular, we analyze a continuous periodic stream of Diracs, characterized by a finite set of time positions and weights. Previous research has only considered sampling of this type of signals, ignoring the presence of quantization, necessary for any practical...
Article-GSIC
We consider the joint optimization of sensor placement and transmission structure for data gathering, where a given number of nodes need to be placed in a field such that the sensed data can be reconstructed at a sink within specified distortion bounds while minimizing the energy consumed for communication. We assume that the nodes use joint entropy coding based on explicit communication between...
Article-GSIC
Lattice networks are widely used in regular settings like grid computing, distributed control, satellite constellations, and sensor networks. Thus, limits on capacity, optimal routing policies, and performance with finite buffers are key issues and are addressed in this paper. In particular, we study the routing algorithms that achieve the maximum rate per node for infinite and finite buffers in...
Article-GSIC
In spite of the success of the standard wavelet transform (WT) in image processing, the efficiency of its representation is limited by the spatial isotropy of its basis functions built in only horizontal and vertical directions. One-dimensional (1-D) discontinuities in images (edges and contours), which are very important elements in visual perception, intersect too many wavelet basis functions...
Articulo-GSIC
This paper presents a novel rotation-invariant image retrieval scheme based on a transformation of the texture information via a steerable pyramid. First, we fit the distribution of the subband coefficients using a joint alpha-stable sub-Gaussian model to capture their non-Gaussian behavior. Then, we apply a normalization process in order to Gaussianize the coefficients. As a result, the feature...
Article-GSIC
Sensor networks measuring correlated data are considered, where the task is to gather data from the network nodes to a sink. A specific scenario is addressed, where data at nodes are lossy coded with high-resolution, and the information measured by the nodes has to be reconstructed at the sink within both certain total and individual distortion bounds. The first problem considered is to find the...
Articulo-GSIC
The standard separable two-dimensional (2-D) wavelet transform (WT) has recently achieved a great success in image processing because it provides a sparse representation of smooth images. However, it fails to capture efficiently one-dimensional (1-D) discontinuities, like edges and contours, that are anisotropic and characterized by geometrical regularity along different directions. In our...
Articulo-GSIC
Artículo que describe un sistema de diseño de escenarios para simulación de conducción.
ARTEC-Article
Arquitectura y sistema para la descripción de experimentos en simulación de conducción.
ARTEC-Articulo
Consider a set of correlated sources located at the nodes of a network, and a set of sinks that are the destinations for some of the sources. The minimization of cost functions which are the product of a function of the rate and a function of the path weight is considered, for both the data-gathering scenario, which is relevant in sensor networks, and general traffic matrices, relevant for...
Article-GSIC
In spite of the success of the standard wavelet transform (WT) in image processing, the efficiency of its representation is limited by the spatial isotropy of its basis functions built in only horizontal and vertical directions. One-dimensional (1-D) discontinuities in images (edges and contours), which are very important elements in visual perception, intersect too many wavelet basis functions...
Articulo-GSIC
In this work, we consider the problem of designing adaptive distributed processing algorithms in large sensor networks that are efficient in terms of minimizing the total power spent for gathering the spatially correlated data from the sensor nodes to a sink node. We take into account both the power spent for purposes of communication as well as the power spent for local computation. Our...
Articulo-GSIC
The analysis and design of routing algorithms for finite buffer networks requires solving the associated queue network problem which is known to be hard. We propose alternative and more accurate approximation models to the usual Jackson's theorem that give more insight into the effect of routing algorithms on the queue size distributions. Using the proposed approximation models, we analyze...
Articulo-GSIC
We consider a sensor network measuring correlated data, where the task is to gather all data from the network nodes to a sink. We consider the case where data at nodes is lossy coded with high-resolution, and the information measured by the nodes should be available at the sink within certain total and individual distortion bounds. First, we consider the problem of finding the optimal...
Articulo-GSIC
This paper presents a novel rotation-invariant image retrieval scheme based on a transformation of the texture information via a steerable pyramid. First, we fit the distribution of the subband coefficients using a joint alpha-stable sub-Gaussian model to capture their non-Gaussian behavior. Then, we apply a normalization process in order to Gaussianize the coefficients. As a result, the feature...
Articulo-GSIC
We consider large sensor networks where the cost of collecting data from the network nodes to the data gathering sink is critical. We propose several algorithms that use limited local communication and distributed signal processing to make communication more efficient in terms of transmission cost. We consider a model that uses distributed wavelet-based signal processing. We first propose an...
Articulo-GSIC
We consider data gathering by a network with a sink node and a tree communication structure, where the goal is to minimize the total transmission cost of transporting the information, collected by the nodes, to the sink node. This problem requires a joint optimization of the data representation at the nodes and of the transmission structure. First, we study the case when the measured data are...
Articulo-GSIC
Lecture Notes in Computer Science, 2004, 230-237
Articulo-LSYM
Proceedings of the Industrial Simulation Conference 2004, 88-93
Articulo-LSYM
We consider the rate-distortion problem for sensing the continuous space-time physical temperature in a circular ring on which a heat source is applied over space and time, and which is also allowed to cool by radiation or convection to its surrounding medium. The heat source is modelled as a continuous space-time stochastic process which is bandlimited over space and time. The temperature field...
Articulo-GSIC
We study network capacity limits and optimal routing algorithms for regular sensor networks, namely, square and torus grid sensor networks, in both, the static case (no node failures) and the dynamic case (node failures). For static networks, we derive upper bounds on the network capacity and then we characterize and provide optimal routing algorithms whose rate per node is equal to this upper...
Articulo-GSIC
This paper presents a new rotation-invariant image retrieval method, which extends a recently introduced classification technique based on steerable wavelet transforms. In the proposed procedure, the feature extraction step consists of estimating the covariations (lower-order cross-correlations) between the wavelet subband coefficients, which are modeled as subGaussian random vectors. The...
Articulo-GSIC
We consider the joint optimization of sensor placement and transmission structure for data gathering, where a given number of nodes need to be placed in a field such that the sensed data can be reconstructed at a sink within specified distortion bounds while minimizing the energy consumed for communication. We assume that the nodes use joint entropy coding based on explicit communication between...
Articulo-GSIC
Recent results in sampling theory [M. Vetterli et al., (2002)] showed that perfect reconstruction of nonbandlimited signals with finite rate of innovation can be achieved performing uniform sampling at or above the rate of innovation. We study analog-to-digital (A/D) conversion of these signals, introducing two types of oversampling and consistent reconstruction.
Articulo-GSIC
We consider the problem of A/D conversion for non-bandlimited signals that have a finite rate of innovation, in particular, the class of a continuous periodic stream of Diracs, characterized by a set of time positions and weights. Previous research has only considered the sampling of these signals, ignoring quantization which is necessary for any practical application (e.g. UWB, CDMA). In order...
Articulo-GSIC
Consider a set of correlated sources located at the nodes of a network, and a sink to which the data from all the sources have to arrive. We address the minimization of a separable joint communication cost function given by the product [rate] o [edge weight]. We present two possible approaches for rate allocation, namely Slepian-Wolf coding, and coding by explicit communication, and compare...
Articulo-GSIC
We consider the problem of correlated data gathering by a network with a sink node and a tree communication structure, where the goal is to minimize the total transmission cost of transporting the information collected by the nodes, to the sink node. Two coding strategies are analyzed: a Slepian-Wolf model where optimal coding is complex and transmission optimization is simple, and a joint...
Articulo-GSIC
Consider a set of correlated sources located at the nodes of a network, and a set of sinks that are the destinations for some of the sources. The minimization of cost functions which are the product of a function of the rate and a function of the path weight is considered, for both the data-gathering scenario, which is relevant in sensor networks, and general traffic matrices, relevant for...
Articulo-GSIC
We consider the rate-distortion problem for sensing the continuous space-time physical temperature in a circular ring on which a heat source is applied over space and time, and which is also allowed to cool by radiation or convection to its surrounding medium. The heat source is modelled as a continuous space-time stochastic process which is bandlimited over space and time. The temperature field...
Articulo-GSIC
In this paper, we propose a new rotation-invariant image retrieval system based on steerable pyramids and the concept of angular alignment across scales. First, we define energy-based texture features which are steerable under rotation, i.e., such that features corresponding to the rotated version of an image can be easily obtained from the features of the original (non-rotated) image. We also...
Articulo-GSIC
Proceedings of the Industrial Simulation Conference 2003, 141-146
Articulo-LSYM
Proceedings of the Industrial Simulation Conference 2003, 401-407
Articulo-LSYM
The usual quantizer based on an n-dimensional lattice # maps a point x # R n to a closest lattice point. Suppose # is the intersection of lattices # 1 , . . . , # r . Then one may instead combine the information obtained by simultaneously quantizing x with respect to each of the # i . This corresponds to decomposing R n into a honeycomb of cells which are the intersections of the Voronoi cells...
Article-GSIC
We study construction of structured regular quantizers for overcomplete expansions in RN. Our goal is to design structured quantizers which allow simple reconstruction algorithms with low complexity and which have good performance in terms of accuracy. Most related work to date in quantized redundant expansions has assumed that the same uniform scalar quantizer was used on all the expansion...
Articulo-GSIC
In this paper, we specifically focus on the problem of power shaping and we examine nested constructions based on trellis codes, which build on simple low dimensional lattices. We propose the idea of performing shaping through a coarse lattice (source code) and we also show how this method can actually be combined with shaping through a fine lattice (channel code) so that a joint shaping can be...
Articulo-GSIC
El diseño de escenarios para simulación de conducción es una tarea compleja ya que requiere, por una parte el diseño del escenario tridimensional, y por otra el diseño de las situaciones dinámicas de conducción. Habitualmente estos escenarios se diseñan utilizando herramientas de modelado de propósito general, y mediante un lenguaje de programación o un lenguaje script para el diseño de las...
ARTEC-Articulo
We present a study of separability of acoustic waveforms of speech at phoneme level. The analyzed data consist of 64 ms segments of acoustic waveforms of individual phonemes from TIMIT data base, sampled at 16 kHz. For each phoneme, by means of principal component analysis, we identify subspaces which contain a given proportion of the total energy of the available waveforms in the time-domain,...
Articulo-GSIC
Estructuras de datos para el diseño de ejercicios en simulación de conducción.
ARTEC-Articulo
We study the construction of structured regular quantizers for overcomplete expansions in RN. Our goal is to design structured quantizers allowing simple reconstruction algorithms with low (memory and computational) complexity and having good performance in terms of accuracy. Most related work to date in quantized redundant expansions has assumed that uniform scalar quantization with the same...
Articulo-GSIC
The use of quantized redundant expansions is useful in applications where the cost of having oversampling in the representation is much lower than the use of a high-resolution quantization (e.g., oversampled A/D). Most work to date has assumed that simple uniform quantization was used on the redundant expansion and then has dealt with methods to improve the reconstruction. Instead, we consider...
Articulo-GSIC
Arquitectura para gestión de tráfico en simuladores de conducción.
ARTEC-Articulo
In this paper we study signal representation using oversampled steerable transforms. While in general it may not be efficient to use an oversampled representation for applications like compression, our work investigates efficient techniques for representing the oversampled data, given that after oversampling there exists substantial redundancy. We discuss different strategies which take advantage...
Articulo-GSIC
