José Luis Martín

Learn More
0262-8856/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.imavis.2009.09.011 * Corresponding author. Tel.: +34 946017344. E-mail address: jesus.lazaro@ehu.es (J. Lázaro). This paper describes a novel approach to binarization techniques. It presents a way of obtaining a threshold that depends both on the image and the final application using a semantic(More)
Optical flow estimation from image sequences has been for several years a mathematical process carried out by general purpose processors in no real time. In this work a specific architecture for this task has been developed and tested with simulators of hardware description languages. This architecture can estimate the optical flow in real time and can be(More)
Usually image sequence processing is accomplished on high-speed general-purpose processors, but until now, the time involved to process image sequences in flows of 25 or 30 frames per second has been very large [1][2]. However, the use of new digital integrated circuit technologies and new smart algorithms make possible to develop circuits to process image(More)
Microgrids (MGs) are promising electrical systems based on Distributed Generation and with high penetration of renewable energy sources. One important feature of MGs is the islanding capability: if there is a disturbance in the main grid, the MG will be automatically disconnected. In theory, once in islanding, the MG can continue the electrical generation(More)
The matrix converter (MC) presents a promising topology that needs to overcome certain barriers (protection systems, durability, the development of converters for real applications, etc.) in order to gain a foothold in the market. Taking into consideration that the great majority of efforts are being oriented toward control algorithms and modulation, this(More)
This paper presents a new low-loss modulation technique for the hybrid three-level four-leg converter. The total losses of the converter are reduced by about 18% on average compared to the standard three-leg neutral-point-clamped converter. Furthermore, the low-frequency voltage oscillation in the neutral point is completely cancelled, and the maximum(More)