Jacobian Computation for Cumulative B-Splines on SE(3) and Application to Continuous-Time Object Tracking

In this paper we propose a method that estimates the SE(3) continuous trajectories (orientation and translation) of the dynamic rigid objects present in a scene, from multiple RGB-D views. Specifically, we fit the object trajectories to cumulative B-Splines curves, which allow us to interpolate, at any intermediate time stamp, not only their poses but also their linear and angular velocities and accelerations. Additionally, we derive in this work the analytical SE(3) Jacobians needed by the optimization, being applicable to any other approach that uses this type of curves. To the best of our knowledge this is the first work that proposes 6-DoF continuous-time object tracking, which we endorse with significant computational cost reduction thanks to our analytical derivations. We evaluate our proposal in synthetic data and in a public benchmark, showing competitive results in localization and significant improvements in velocity estimation in comparison to discrete-time approaches. © 2016 IEEE

La Virtualización de la sociedad

Tres virtualizaciones han creado lo humano: el lenguaje, la técnica y el contrato. La tesis fuerte de Lévy consiste en afirmar que los seres humanos se constituyen en y por la virtualización. Hay un permanente proceso de autocreación de la humanidad. No obstante, éste se ha visto en el presente acelerado hasta límites hasta ahora insospechados. Precisamente, la mencionada aceleración no permite mantener la distinción entre los tres tipos de virtualización. Los tres se mezclan en una espiral que los torna indistinguibles

Reseñas

Nikolas Rose, The Politics of Life Itself. Biomedicine, Power, and Subjectivity in the Twenty-First centur

¿Hacia la desaparición de la tácita renovación en el contrato de seguro?

A la luz de la reforma operada recientemente en el Derecho de Seguros francés, en donde se ha suprimido la tácita renovación a voluntad del asegurado-consumidor en determinado ramos de seguros de daños y en el seguro del automóvil, se analiza el dato legal y el origen de la práctica aseguradora de la tácita renovación en el contrato de seguro. Se concluye con referencias al impacto de esta medida auspiciable en el Derecho español

Economic regional impacts of water transfers: the role of factor mobility in a case study of the agricultural sector in the Balearic Islands

Using a CGE model for the Balearic Islands, we simulate the effects of an agricultural water market in the farming sector facing reductions in the water endowment. The market lessens the negative effects on farming communities of short-term water restrictions associated with cyclical droughts. However, in scenarios of permanent reductions, such as those envisaged by global warming predictions or those that result from the implementation of the European Water Framework Directive, a water market may aggravate the negative effects of water shortage. Therefore, the paper shows that generalizations cannot be made about the effects of water markets on farming communities.Agricultural and Food Policy, Environmental Economics and Policy, D58, Q1, Q25, R13,