Dipartimento d'Ingegneria

Electrical Engineering - Elettrotecnica

The field studies the theoretical and experimental aspects and the development of related applications of the two complementary strands of EMF and electrical and electronic circuits in civil, industrial and information engineering. In the first field problems of electromagnetic field, electromagnetic compatibility, and magnetofluidodinamics, of modeling and diagnostics of electric and magnetic materials of interest are studied. In the second line we study circuits, both analog and digital, and the related models: linear, nonlinear and time-varying lumped and distributed signal and power, mono and multi-dimensional. The two complementary approaches are applied to the analysis, synthesis, numerical modeling and automatic design of the equipment, devices and electrical systems, engineering of plasmas, thermonuclear fusion, particle accelerators, electrothermics, electromagnetic compatibility, the quality, safety and environmental impact in electrical applications, the circuits for signal processing, neural networks and adaptive circuits, power electronics and conversion of electrical energy.

ARTICOLO

In Research ,
Scritto da Giovedì, 20 Marzo 2014 09:42
Retinal Blood Vessel Segmentation using Line Operators and Support Vector Classification
     
Elisa Ricci            Renzo Perfetti

IEEE Transactions on Medical Imaging vol. 26, N. 10, 2007


Abstract. In the framework of computer-aided diagnosis of eye diseases, retinal vessel segmentation based on line operators is proposed. A line detector, previously used in mammography, is applied to the green channel of the retinal image. It is based on the evaluation of the average grey level along lines of fixed length passing through the target pixel at different orientations. Two segmentation methods are considered. The first uses the basic line detector whose response is thresholded to obtain unsupervised pixel classification. As a further development we employ two orthogonal line detectors along with the grey level of the target pixel to construct a feature vector for supervised classification using a support vector machine (SVM). The effectiveness of both methods is demonstrated through receiver operating characteristic (ROC) analysis on two publicly available databases of color fundus images.

ARTICOLO

In Research ,
Scritto da Giovedì, 20 Marzo 2014 09:22

 

SINGLE-SIDED OBJECTIVE SPEECH INTELLIGIBILITY ASSESSMENT BASED ON SPARSE SIGNAL REPRESENTATION

Giovanni Costantini, Massimiliano Todisco, Renzo Perfetti, Andrea Paoloni, Giovanni Saggio

2012 IEEE INTERNATIONAL WORKSHOP ON MACHINE LEARNING FOR SIGNAL PROCESSING, SEPT. 23–26, 2012, SANTANDER, SPAIN

 

Transcription of speech signals, originating from a
lawful interception, is particularly important in the forensic
phonetics framework. These signals are often degraded and
the transcript may not replicate what was actually
pronounced. In the absence of the clean signal, the only way
to estimate the level of accuracy that can be obtained in the
transcription is to develop an objective methodology for
intelligibility measurements. In this paper a method based
on the Normalized Spectrum Envelope (NSE) and Sparse
Non-negative Matrix Factorization (SNMF) is proposed to
evaluate the signal intelligibility. The approaches are tested
with three different noise types and the results are compared
with the speech intelligibility scores measured by subjective
tests. The results of the experiments show a high correlation
between objective measurements and subjective evaluations.
Therefore, the proposed methodology can be successfully
used in order to establish whether a given intercepted signal
can be transcribed with sufficient reliability.






E. Cardelli, A. Faba, N. Palotti, M. Pompei and F. Tissi - INTERMAG 2012, 7-11 May, Vancouver.

Abstract - This paper deals with the design and the experimental verification of two distinct magnetic field exposure systems for applications related respectively to the in vivo and the in vitro analysis of the magnetic field effects at extremely low frequency ELF. The performances of the two systems in exposure uniformity, magnetic induction and frequency range are discussed in the paper, and verified with a dedicated series of experimental tests. Finally some information about the level of temperature and vibration increase expected and their control are given, in order to show the capability of the exposure systems presented to be efficient tools for magnetic ELF exposure studies not affected by typical artifacts produced by this kind of mechanical parasitic effects.

CEM Laboratory

Scritto da Martedì, 18 Marzo 2014 11:05
The CEM laboratory is part of the "University of Perugia - Polo Scientifico e Didattico di Terni". The activities are focused on electromagnetic compatibility, electrical safety, electromagnetic nondestructive testing and magnetic materials.

More information at http://laboratoriocem.tr.unipg.it/index.htm

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