Recursos de colección

Archivo Digital UPM (106.784 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Telecomunicaciones

Mostrando recursos 1 - 20 de 2.216

  1. Modeling sub-threshold slope and DIBL mismatch of sub-22nm FinFet

    Royer del Barrio, Pablo; López Vallejo, Marisa
    A great challenge for future information technologies is building reliable systems on top of unreliable components. Parameters of modern and future technology devices are affected by severe levels of process variability and devices will degrade and even fail during the normal lifeDme of the chip due to aging mechanisms. These extreme levels of variability are caused by the high device miniaturizaDon and the random placement of individual atoms. Variability is considered a "red brick" by the InternaDonal Technology Roadmap for Semiconductors. The session is devoted to this topic presenDng research experiences from the Spanish Network on Variability called VARIABLES. In...

  2. On-road visual vehicle tracking using Markov chain Monte Carlo with metropolis sampling

    Arróspide Laborda, Jon; Salgado Álvarez de Sotomayor, Luis
    In this study, a method for vehicle tracking through video analysis based on Markov chain Monte Carlo (MCMC) particle filtering with metropolis sampling is proposed. The method handles multiple targets with low computational requirements and is, therefore, ideally suited for advanced-driver assistance systems that involve real-time operation. The method exploits the removed perspective domain given by inverse perspective mapping (IPM) to define a fast and efficient likelihood model. Additionally, the method encompasses an interaction model using Markov Random Fields (MRF) that allows treatment of dependencies between the motions of targets. The proposed method is tested in highway sequences and compared...

  3. Bounded non-deterministic planning for multimedia adaptation

    López, Fernando; Jannach, Dietmar; Martinez, Jose Maria; Timmerer, Christian; García Santos, Narciso; Hellwagner, Hermann
    This paper proposes a novel combination of artificial intelligence planning and other techniques for improving decision-making in the context of multi-step multimedia content adaptation. In particular, it describes a method that allows decision-making (selecting the adaptation to perform) in situations where third-party pluggable multimedia conversion modules are involved and the multimedia adaptation planner does not know their exact adaptation capabilities. In this approach, the multimedia adaptation planner module is only responsible for a part of the required decisions; the pluggable modules make additional decisions based on different criteria. We demonstrate that partial decision-making is not only attainable, but also introduces...

  4. Moving object detection for real-time augmented reality applications in a GPGPU

    Cuevas Rodríguez, Carlos; Berjón Díez, Daniel; Morán Burgos, Francisco; García Santos, Narciso
    The last generation of consumer electronic devices is endowed with Augmented Reality (AR) tools. These tools require moving object detection strategies, which should be fast and efficient, to carry out higher level object analysis tasks. We propose a lightweight spatio-temporal-based non-parametric background-foreground modeling strategy in a General Purpose Graphics Processing Unit (GPGPU), which provides real-time high-quality results in a great variety of scenarios and is suitable for AR applications.

  5. Network assisted content protection architectures for a connected world

    Villegas, Álvaro; Pérez García, Pablo; Cubero Muñoz, Jose M.; Estalayo Gutierrez, Enrique; García Santos, Narciso
    Content protection is a key component for the success of a multimedia services platform, as proven by the plethora of solutions currently on the market. In this paper we analyze a new network scenario where permanent bidirectional connectivity and video-aware encryption technologies allow a trustful operation of ubiquitous end devices. We propose new scalable models for a content protection architecture that may achieve dramatic improvement in robustness, reliability, and scalability. Selective ciphering and countermeasures are included in those models, together with several examples of their application.

  6. A framework for the analysis and optimization of encoding latency for multiview video

    Carballeira López, Pablo; Cabrera Quesada, Julian; Ortega Diego, Antonio; Jaureguizar Núñez, Fernando; García Santos, Narciso
    We present a novel framework for the analysis and optimization of encoding latency for multiview video. Firstly, we characterize the elements that have an influence in the encoding latency performance: (i) the multiview prediction structure and (ii) the hardware encoder model. Then, we provide algorithms to find the encoding latency of any arbitrary multiview prediction structure. The proposed framework relies on the directed acyclic graph encoder latency (DAGEL) model, which provides an abstraction of the processing capacity of the encoder by considering an unbounded number of processors. Using graph theoretic algorithms, the DAGEL model allows us to compute the encoding...

  7. Providing 3D video services: the challenge from 2D to 3DTV quality of experience

    Cubero Muñoz, Jose M.; Gutierrez Sanchez, Jesus; Pérez García, Pablo; Estalayo Gutierrez, Enrique; Cabrera Quesada, Julian; Jaureguizar Núñez, Fernando; García Santos, Narciso
    Recently, three-dimensional (3D) video has decisively burst onto the entertainment industry scene, and has arrived in households even before the standardization process has been completed. 3D television (3DTV) adoption and deployment can be seen as a major leap in television history, similar to previous transitions from black and white (B&W) to color, from analog to digital television (TV), and from standard definition to high definition. In this paper, we analyze current 3D video technology trends in order to define a taxonomy of the availability and possible introduction of 3D-based services. We also propose an audiovisual network services architecture which provides...

  8. Temporal segmentation tool for high-quality real time video editing software

    Cuevas Rodríguez, Carlos; García Santos, Narciso
    The increasing use of video editing software requires faster and more efficient editing tools. As a first step, these tools perform a temporal segmentation in shots that allows a later building of indexes describing the video content. Here, we propose a novel real-time high-quality shot detection strategy, suitable for the last generation of video editing software requiring both low computational cost and high quality results. While abrupt transitions are detected through a very fast pixel-based analysis, gradual transitions are obtained from an efficient edge-based analysis. Both analyses are reinforced with a motion analysis that helps to detect and discard false...

  9. Analysis of pixel-mapping rounding on geometric distortion as a prediction for view synthesis distortion

    Carballeira López, Pablo; Cabrera Quesada, Julian; Ekmekcioglu, E.; Jaureguizar Núñez, Fernando; García Santos, Narciso
    We analyze the performance of the geometric distortion, incurred when coding depth maps in 3D Video, as an estimator of the distortion of synthesized views. Our analysis is motivated by the need of reducing the computational complexity required for the computation of synthesis distortion in 3D video encoders. We propose several geometric distortion models that capture (i) the geometric distortion caused by the depth coding error, and (ii) the pixel-mapping precision in view synthesis. Our analysis starts with the evaluation of the correlation of geometric distortion values obtained with these models and the actual distortion on synthesized views. Then, the...

  10. Low latency LDGM code for multimedia-packet stream in bursty packet loss networks

    Casu, Filippo; Cabrera Quesada, Julian; Jaureguizar Núñez, Fernando; García Santos, Narciso
    In this paper we present a FEC scheme based on simple LDGM codes to protect packetized multimedia streams. We demonstrate that simple LDGM codes working with a limited number of packets (small values of k) obtain recovery capabilities, against bursty packet losses, that are similar to those of other more complex FEC-based schemes designed for this type of channels.

  11. Monitoring packet loss impact in IPTV and 3DTV receivers

    Gutierrez Sanchez, Jesus; Pérez García, Pablo; Jaureguizar Núñez, Fernando; Cabrera Quesada, Julian; García Santos, Narciso
    Considering a scalable video quality monitoring architecture to detect transmission errors at households, we propose a technique to detect packet losses in IPTV and Side-by-Side 3DTV and evaluate their impact on the perceived quality.

  12. Tendencias y perspectivas en las comunicaciones ópticas

    Martín Pereda, José Antonio
    El autor expone diversos puntos a considerar a la hora de hacer una adecuada elección de los medios emisores de radiación, como la longitud de onda a transmitir, la posibilidad de fácil modulación de la señal emitida y las características de los pulsos transmitidos. Se analizan los dos principales candidatos como emisores de luz: los láseres basados en el AsGa y los que están basados en el Nd.

  13. Moving object detection strategy for augmented-reality applications in a GPGPU by using CUDA

    Berjón Díez, Daniel; Cuevas Rodríguez, Carlos; Morán Burgos, Francisco; García Santos, Narciso
    A spatial-color-based non-parametric background-foreground modeling strategy in a GPGPU by using CUDA is proposed. This strategy is suitable for augmented-reality applications, providing real-time high-quality results in a great variety of scenarios.

  14. NAMA3DS1-COSPAD1: Subjective video quality assessment database on coding conditions introducing freely available high quality 3D stereoscopic sequences

    Urvoy, Matthieu; Barkowsky, Marcus; Cousseau, Romain; Koudota, Yao; Ricordel, Vincent; Le Callet, Patrick; Gutierrez Sanchez, Jesus; García Santos, Narciso
    Research in stereoscopic 3D coding, transmission and subjective assessment methodology depends largely on the availability of source content that can be used in cross-lab evaluations. While several studies have already been presented using proprietary content, comparisons between the studies are difficult since discrepant contents are used. Therefore in this paper, a freely available dataset of high quality Full-HD stereoscopic sequences shot with a semiprofessional 3D camera is introduced in detail. The content was designed to be suited for usage in a wide variety of applications, including high quality studies. A set of depth maps was calculated from the stereoscopic pair....

  15. Subjective study of adaptive streaming strategies for 3DTV

    Gutierrez Sanchez, Jesus; Pérez García, Pablo; Jaureguizar Núñez, Fernando; Cabrera Quesada, Julian; García Santos, Narciso
    Although the delivery of 3D video services to households is nowadays a reality thanks to frame-compatible formats, many efforts are being made to obtain efficient methods to transmit 3D content offering a high quality of experience to the end users. In this paper, a stereoscopic video streaming scenario is considered and the perceptual impact of various strategies applicable to adaptive streaming situations are compared. Specifically, the mechanisms are based on switching between copies of the content with different coding qualities, on discarding frames of the sequence, on switching from 3D to 2D and on using asymmetric coding of the stereo...

  16. Systematic analysis of the decoding delay on MVC decoders

    Carballeira López, Pablo; Cabrera Quesada, Julian; Jaureguizar Núñez, Fernando; García Santos, Narciso
    We present a framework for the analysis of the decoding delay and communication latency in Multiview Video Coding. The application of this framework on MVC decoders allows minimizing the overall delay in immersive video-conference systems.

  17. Cuasihistorieta a base de investigación y ciencia

    Martín Pereda, José Antonio
    Reflexión en clave de humor sobre cómo encaran los dirigentes la necesidad de dar directrices para incentivar la investigación en España.

  18. Laboratorio remoto eLab3D: un entorno innovador para el aprendizaje de competencias prácticas en electrónica

    López Gregorio, Sergio; Carpeño Ruiz, Antonio; Arriaga Garcia de Andoain, Jesus Maria; Arcas Castro, Guillermo de; Contreras, Daniel; Salazar, José; Barras, Miguel
    Este artículo muestra la utilización de las nuevas tecnologías al servicio del aprendizaje de competencias prácticas en electrónica, siendo un ejemplo de adaptación de los recursos educativos a diferentes contextos y necesidades. Se trata de un laboratorio remoto en el que la adecuada complementación de un hardware configurable y un software de última generación permite al estudiante realizar prácticas de electrónica y diseño de circuitos en un mundo virtual 3D. El usuario dispone de un avatar e interacciona con réplicas virtuales de instrumentos, placas de circuitos, componentes o cables de forma muy similar a como se opera en un laboratorio...

  19. Processing of ultra-wideband low-frequency signals, for application in Foliage Penetration (FOPEN) Synthetic Aperture Radar (SAR) systems

    García Gómez, Francisco Javier
    Foliage Penetration (FOPEN) radar systems were introduced in 1960, and have been constantly improved by several organizations since that time. The use of Synthetic Aperture Radar (SAR) approaches for this application has important advantages, due to the need for high resolution in two dimensions. The design of this type of systems, however, includes some complications that are not present in standard SAR systems. FOPEN SAR systems need to operate with a low central frequency (VHF or UHF bands) in order to be able to penetrate the foliage. High bandwidth is also required to obtain high resolution. Due to the low central frequency, large integration angles are required...

  20. Validation of a novel approach to subjective quality evaluation of conventional and 3D broadcasted video services

    Gutierrez Sanchez, Jesus; Pérez García, Pablo; Jaureguizar Núñez, Fernando; Cabrera Quesada, Julian; García Santos, Narciso
    Transmission errors are the main cause of degradation of the quality of real broadcasted video services. Therefore, knowing their impact on the quality of experience of the end users is a crucial issue. For instance, it would help to improve the performance of the distribution systems, and to develop monitoring tools to automatically estimate the quality perceived by the end users. In this paper we validate a subjective evaluation approach specifically designed to obtain meaningful results of the effects of degradations caused by transmission errors. This methodology has been already used in our previous works with monoscopic and stereoscopic videos....

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