Ara es mostren els items 1-20 de 72

    • A bayesian approach to simultaneously recover camera pose and non-rigid shape from monocular images 

      Moreno-Noguer, Francesc; Porta Pleite, Josep Maria (2016)
      Article
      Accés obert
      In this paper we bring the tools of the Simultaneous Localization and Map Building (SLAM) problem from a rigid to a deformable domain and use them to simultaneously recover the 3D shape of non-rigid surfaces and the sequence ...
    • A branch-and-prune method to solve closure equations in dual quaternions 

      Shabani, Arya; Porta Pleite, Josep Maria; Thomas, Federico (2021)
      Article
      Accés obert
      Using dual quaternions, the closure equations of a kinematic loop can be expressed as a system of multiaffine quations. In this paper, this property is leveraged to introduce a branch-and-prune method specially tailored ...
    • A Convolutional Neural Network for the automatic diagnosis of collagen VI-related muscular dystrophies 

      Rodríguez Bazaga, Adrián; Roldán Molina, Mónica; Badosa Gallego, Maria del Carmen; Jiménez Mallebrera, Cecilia; Porta Pleite, Josep Maria (2019-12-01)
      Article
      Accés obert
      The development of machine learning systems for the diagnosis of rare diseases is challenging, mainly due to the lack of data to study them. This paper surmounts this obstacle and presents the first Computer-Aided Diagnosis ...
    • A fast branch-and-prune algorithm for the position analysis of spherical mechanisms 

      Shabani, Arya; Sarabandi, Soheil; Porta Pleite, Josep Maria; Thomas, Federico (Springer, 2019)
      Text en actes de congrés
      Accés obert
      Different branch-and-prune schemes can be found in the literature for numerically solving the position analysis of spherical mechanisms. For the prune operation, they all rely on the propagation of motion intervals. They ...
    • A general method for the numerical computation of manipulator singularity sets 

      Bohigas Nadal, Oriol; Zlatanov, Dimiter; Ros Giralt, Lluís; Manubens Ferriol, Montserrat; Porta Pleite, Josep Maria (2014)
      Article
      Accés obert
      The analysis of singularities is central to the development and control of a manipulator. However, existing methods for singularity set computation still concentrate on specific classes of manipulators. The absence of ...
    • A linear relaxation technique for the position analysis of multi-loop linkages 

      Porta Pleite, Josep Maria; Ros Giralt, Lluís; Thomas, Federico (2008)
      Report de recerca
      Accés obert
      This report presents a new method able to isolate all configurations that a multi-loop linkage can adopt. We tackle the problem by providing formulation and resolution techniques that fit particularly well together. The ...
    • A linear relaxation technique for the position analysis of multiloop linkages 

      Porta Pleite, Josep Maria; Ros Giralt, Lluís; Thomas, Federico (2009)
      Article
      Accés obert
      This paper presents a new method to isolate all configurations that a multiloop linkage can adopt. The problem is tackled by means of formulation and resolution techniques that fit particularly well together. The adopted ...
    • A matrix-based approach to the image moment problem 

      Martínez Bauzà, Judit; Porta Pleite, Josep Maria; Thomas, Federico (2006-11)
      Article
      Accés obert
      An image can be seen as an element of a vector space and hence it can be expressed in as a linear combination of the elements of any non necessarily orthogonal basis of this space. After giving a matrix formulation of this ...
    • A randomised kinodynamic planner for closed-chain robotic systems 

      Bordalba Llaberia, Ricard; Ros Giralt, Lluís; Porta Pleite, Josep Maria (Institute of Electrical and Electronics Engineers (IEEE), 2021-02-01)
      Article
      Accés obert
      Kinodynamic rapidly-exploring random tree (RRT) planners are effective tools for finding feasible trajectories in many classes of robotic systems. However, they are hard to apply to systems with closed-kinematic chains, ...
    • A randomized kinodynamic planner for closed-chain robotic systems 

      Bordalba Llaberia, Ricard; Ros Giralt, Lluís; Porta Pleite, Josep Maria (2019)
      Report de recerca
      Accés obert
      Kinodynamic RRT planners are effective tools for finding feasible trajectories in many classes of robotic systems. However, they are hard to apply to systems with closed-kinematic chains, like parallel robots, cooperating ...
    • A reconfigurable asymmetric 3-UPU parallel robot 

      Sarabandi, Soheil; Grosch Obregon, Patrick John; Porta Pleite, Josep Maria; Thomas, Federico (2018)
      Text en actes de congrés
      Accés obert
      Parallel robots with three UPU legs have received a lot of attention due to the possibility of assembling these legs so that the robot performs either a pure translational or a pure rotational motion. Nevertheless, some ...
    • A singularity-free path planner for closed-chain manipulators 

      Bohigas Nadal, Oriol; Henderson, Michael E.; Ros Giralt, Lluís; Porta Pleite, Josep Maria (IEEE, 2012)
      Text en actes de congrés
      Accés obert
      This paper provides an algorithm for computing singularity-free paths on non-redundant closed-chain manipulators. Given two non-singular configurations of the manipulator, the method attempts to connect them through a ...
    • A singularity-robust LQR controller for parallel robots 

      Bordalba Llaberia, Ricard; Porta Pleite, Josep Maria; Ros Giralt, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés obert
      Parallel robots exhibit the so-called forward singularities, which complicate substantially the planning and control of their motions. Often, such complications are circumvented by restricting the motions to singularity-free ...
    • A space decomposition method for path planning of loop linkages 

      Porta Pleite, Josep Maria; Cortes, Juan; Ros Giralt, Lluís; Thomas, Federico (IEEE, 2007)
      Text en actes de congrés
      Accés obert
      This paper introduces box approximations as a new tool for path planning of closed-loop linkages. Box approximations are finite collections of rectangloids that tightly envelop the robot's free space at a desired resolution. ...
    • A space decomposition method for path planning of loop linkages 

      Porta Pleite, Josep Maria; Cortés, Juan; Ros Giralt, Lluís; Thomas, Federico (2007)
      Text en actes de congrés
      Accés obert
      This paper introduces box approximations as a new tool for path planning of closed-loop linkages. Box approximations are finite collections of rectangloids that tightly envelop the robot's free space at a desired resolution. ...
    • Amortized constant time estimation in Pose SLAM and hierarchical SLAM using a mixed Kalman-information filter 

      Ila, Viorela Simona; Porta Pleite, Josep Maria; Andrade-Cetto, Juan (2011)
      Article
      Accés obert
      The computational bottleneck in all information-based algorithms for simultaneous localization and mapping (SLAM) is the recovery of the state mean and covariance. The mean is needed to evaluate model Jacobians and the ...
    • Amortized constant time state estimation in SLAM using a mixed Kalman-information filter 

      Ila, Viorela Simona; Porta Pleite, Josep Maria; Andrade-Cetto, Juan (2009)
      Comunicació de congrés
      Accés obert
      The computational bottleneck in all informationbased algorithms for SLAM is the recovery of the state mean and covariance. The mean is needed to evaluate model Jacobians and the covariance is needed to generate data ...
    • An open-source toolbox for motion analysis of closed-chain mechanisms 

      Porta Pleite, Josep Maria; Ros Giralt, Lluís; Bohigas Nadal, Oriol; Manubens Ferriol, Montserrat; Rosales Gallegos, Carlos; Jaillet, Leonard Georges (Springer, 2013)
      Text en actes de congrés
      Accés obert
      Many situations in Robotics require an effective analysis of the motions of a closed-chain mechanism. Despite appearing very often in practice (e.g. in parallel manipulators, reconfigurable robots, or molecular compounds), ...
    • Análisis comparativo del test de Bosco con técnicas de video en 3D (Peak Performance) 

      Morgenstern de Muller, Christian Rudolf; Porta Pleite, Josep Maria; Parreño Catalán, José Luis; Ruano Gil, D. (Sociedad Ibérica de Biomecánica y Biomateriales, 1993)
      Article
      Accés obert
    • Androgenic activation, impairment of the monoaminergic system and altered behavior in zebrafish larvae exposed to environmental concentrations of fenitrothion 

      Faria, Melissa; Prats, Eva; Rosas Ramírez, Jonathan Ricardo; Bellot, Marina; Bedrossiantz, Juliette; Pagano, Maria; Valls Brusco, Arnau; Gomez Canela, Cristian; Porta Pleite, Josep Maria; Mestres, Jordi; Garcia Reyero, Natalia; Faggio, Caterina; Gómez Oliván, Leobardo Manuel; Raldúa Pérez, Demetrio José (Elsevier, 2021)
      Article
      Accés obert
      Fenitrothion is an organophosphorus insecticide usually found in aquatic ecosystems at concentrations in the range of low ng/L. In this manuscript we show that 24 h exposure to environmental concentrations of fenitrothion, ...