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    • openAccess   Single-shot color digital holography based on the fractional Talbot effect 

      Araiza Esquivel, María A.; Martínez-León, Lluís; Javidi, Bahram; Andrés, Pedro; Lancis, Jesús; Tajahuerce, Enrique Optical Society of America (2011-02-28)
      We present a method for recording on-axis color digital holograms in a single shot. Our system performs parallel phase-shifting interferometry by using the fractional Talbot effect for every chromatic channel simultaneously. ...

    • closedAccess   View-dependent pruning for real-time rendering of trees 

      Gumbau Portalés, Jesús; Chover, Miguel; Remolar, Inmaculada; Rebollo Santamaría, Cristina Elsevier (2011-04)
      The main problem in the real-time rendering of vegetation is the massive amount of primitives to be rendered. These primitives are needed to fully describe the geometry of the plants. However, some of them are not visible ...

    • openAccess   A new approach to visual-based sensory system for navigation into orange groves 

      Torres-Sospedra, Joaquín; Nebot Roglá, Patricio MDPI Publishing (2011-04-06)
      One of the most important parts of an autonomous robot is to establish the path by which it should navigate in order to successfully achieve its goals. In the case of agricultural robotics, a procedure that determines this ...

    • openAccess   A new HLA-based distributed control architecture for agricultural teams of robots in hybrid applications with real and simulated devices or environments 

      Nebot Roglá, Patricio; Torres-Sospedra, Joaquín; Martínez, Rafael J. MDPI Publishing (2011-04-14)
      The control architecture is one of the most important part of agricultural robotics and other robotic systems. Furthermore its importance increases when the system involves a group of heterogeneous robots that should ...

    • openAccess   Perception of products by progressive multisensory integration: a study on hammers 

      Vergara, Margarita; Mondragón Donés, Salvador; Sancho-Bru, Joaquin L.; Company, Pedro; Agost, Maria-Jesus Elsevier (2011-07)
      The aim of this work is to determine the influence of multisensory (visual-haptic) integration and the level of interaction (seeing photographs, seeing the actual product, touching it and using it) on the perception of ...

    • openAccess   Citizen-based sensing of crisis events: sensor web enablement for volunteered geographic information 

      Schade, Sven; Díaz Sánchez, Laura; Ostermann, Frank; Spinsanti, Laura; Luraschi, Gianluca; Cox, Simon; Núñez Redó, Manuela; De Longueville, Bertrand Springer Verlag (2011-07-19)
      Thanks to recent convergence of greater access to broadband connections, the availability of Global Positioning Systems in small packages at affordable prices and more participative forms of interaction on the Web (Web ...

    • closedAccess   On the characterization of parabolicity and hyperbolicity of submanifolds 

      Esteve Siscar, Antonio; Palmer Andreu, Vicente London Mathematical Society (2011-08)
      We give a set of sufficient and necessary conditions for parabolicity and hyperbolicity of a submanifold with controlled mean curvature in a Riemannian manifold with a pole and with sectional curvatures bounded from above ...

    • closedAccess   Visualization of level-of-detail meshes on the GPU 

      Ripollés Mateu, Oscar Enrique; Ramos, Jose Francisco; Chover, Miguel Springer Verlag (2011-09-01)
      Extensive research has been carried out in multiresolution models for many decades. The tendency in recent years has been to harness the potential of GPUs to perform the level-of-detail extraction on graphics hardware. The ...

    • openAccess   Coherence revivals in two-photon frequency combs 

      Torres Company, Víctor; Lancis, Jesús; Lajunen, Hanna; Friberg, Ari T. American Physical Society (2011-09-16)
      We describe and theoretically analyze the self-imaging Talbot effect of entangled photon pairs in the time domain. Rich phenomena are observed in coherence propagation along dispersive media of mode-locked two- photon ...

    • openAccess   Tsallis entropy for geometry simplification 

      Castelló Boscá, Pascual; González, Carlos; Sbert Casasayas, Mateu; Feixas, Miguel; Chover, Miguel MDPI Publishing (2011-09-29)
      This paper presents a study and a comparison of the use of different information-theoretic measures for polygonal mesh simplification. Generalized measures from Information Theory such as Havrda–Charva ́t–Tsallis entropy ...

    • openAccess   Development of spatial density maps based on geoprocessing web services: application to tuberculosis incidence in Barcelona, Spain 

      Dominkovics, Pau; Granell, Carlos; Perez-Navarro, Antoni; Casals, Martí; Orcau, Àngels; Caylà, Joan A. BioMed Central (2011-11-29)
      Background: Health professionals and authorities strive to cope with heterogeneous data, services, and statistical models to support decision making on public health. Sophisticated analysis and distributed processing ...

    • closedAccess   Speeding up the log-polar transform with inexpensive parallel hardware: graphics units and multi-core architectures 

      Antonelli, Marco; Igual, Francisco; Ramos, Jose Francisco; Traver Roig, Vicente Javier Springer-Verlag (2012)
      Log-polar imaging is a kind of foveal, biologically inspired visual representation with advantageous properties in practical applications in computer vision, robotics, and other fields. While the cheapest, most flexible, ...

    • openAccess   On the Dynamic Time Warping of Cyclic Sequences for Shape Retrieval 

      Palazón González, Vicente; Marzal Varó, Andrés Elsevier (2012)
      In the last years, in shape retrieval, methods based on Dynamic Time Warping and sequences where each point of the contour is represented by elements of several dimensions have had a significant presence. In this approach ...

    • closedAccess   Self-similar behavior in semiconductor superlattices 

      Castro-Palacio, Juan Carlos; Villatoro, Francisco R.; Mendoza-Yero, Omel; Velázquez Abad, Luisberis; Monsoriu, Juan A. World Scientific Publishing Company (2012)
      The scattering of particles in fractal superlattices has been analyzed by means of the transfer matrix method. The fractal superlattice consists of alternating layers of semiconductor materials following the rule of a ...

    • openAccess   Measuring complexity in OGC web services XML schemas: pragmatic use and solutions 

      Tamayo Fong, Alain; Huerta, Joaquin; Granell, Carlos Taylor & Francis (2012)
      The use of standards in the geospatial domain, such as those defined by the Open Geospatial Consortium (OGC), for exchanging data has brought a great deal of interoperability upon which systems can be built in a reliable ...

    • openAccess   Volume growth, number of ends and the topology of complete submanifolds 

      Gimeno, Vicent; Palmer Andreu, Vicente arXIV (2012)
      Given a complete isometric immersion $\phi: P^m \longrightarrow N^n$ in an ambient Riemannian manifold $N^n$ with a pole and with radial sectional curvatures bounded from above by the corresponding radial sectional curvatures ...

    • openAccess   Ultrashort pulse fiber delivery with optimized dispersion control by reflection grisms at 800 nm 

      Kalashyan, Meri; Lefort, Claire; Martínez-León, Lluís; Mansuryan, Tigran; Mouradian, Levon; Louradour, Frederic Optical Society of America (2012)
      We experimentally demonstrate a compact and efficient arrangement for fiber delivery of sub-30 fs energetic light pulses at 800 nm. Pulses coming from a broadband Ti:Sapphire oscillator are negatively pre-chirped by a ...

    • openAccess   Experimental Demonstration of the Quasi-Direct Space-to-Time Pulse Shaping Principle 

      Loriot, Vincent; Mendoza-Yero, Omel; Mínguez-Vega, Gladys; Bañares, Luis; De Nalda, Rebeca Institute of Electrical and Electronics Engineers (IEEE) (2012)
      A new strategy of pulse shaping based on the quasi-direct space-to-time (QDST) conversion principle has been recently proposed theoretically [Mínguez-Vega et al., Opt. Express 16, 16993 (2008)]. In this letter, the ...

    • openAccess   Free-Motion Beam Propagation Factor Measurement by Means of a Liquid Crystal Spatial Light Modulator 

      Pérez Vizcaíno, Jorge; Mendoza-Yero, Omel; Martinez Cuenca, Raul; Martínez-León, Lluís; Tajahuerce, Enrique; Lancis, Jesús Institute of Electrical and Electronics Engineers (2012)
      In contrast to the mechanical scanning procedure described in the standard ISO/DIS 11146, the use of electronically tunable focal length lenses has proved its capability for the measurement of the laser beam propagation ...

    • openAccess   Multispectral integral imaging acquisition and processing using a monochrome camera and a liquid crystal tunable filter 

      Latorre Carmona, Pedro; Sánchez Ortiga, Emilio; Xiao, Xiao; Pla, Filiberto; Martínez Corral, Manuel; Navarro, Héctor; Saavedra, Genaro; Javidi, Bahram Optical Society of America (2012)
      This paper presents an acquisition system and a procedure to capture 3D scenes in different spectral bands. The acquisition system is formed by a monochrome camera, and a Liquid Crystal Tunable Filter (LCTF) that allows ...