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A feature detection system has been developed for real-time identification of lines, circles and people legs from laser range data. A new method suitable for arc/circle detection is proposed: the Inscribed Angle Variance (IAV). Lines are detected using a recursive line fitting method. The people leg detection is based on geometrical relations. The system(More)
We study blind identification of multiple-input multiple-output (MIMO) systems based only on 2nd order statistics (SOS). This problem arises naturally in many applications, for example, SDMA (Space Division Multiple Access) networks for wireless multiuser communications. The problem of SOS-based blind MIMO channel identification is not strictly well-posed.(More)
CT perfusion (CTP) is part of the initial evaluation of stroke patients, allowing differentiation between infarcted tissue and the ischaemic penumbra and helping in the selection of patients for endovascular treatment. This study assessed the reliability of the qualitative evaluation CTP maps in defining the ischemic penumbra and identified potential(More)
Image reconstruction from noisy and incomplete observations is usually an ill-posed problem. A Bayesian framework may be adopted do deal with this such inverse task by well posing the reconstruction problem. In this approach, the ill poseness nature of the reconstruction is removed by minimizing a two-term energy function. The first term pushes the solution(More)
We consider parametric statistical models indexed by embedded submanifolds /spl otimes/ of /spl Ropf//sup p/. This setup occurs in practical applications whenever the parameter of interest /spl theta/ is known to satisfy a priori deterministic constraints, encoded herein by /spl otimes/. We assume that the submanifold /spl otimes/ is connected and endowed(More)
Many optimization problems formulated on Riemannian manifolds involve their intrinsic Riemannian squared distance function. A notorious and important example is the centroid computation of a given finite constellation of points. In such setups, the implementation of the fast intrinsic Newton optimization scheme requires the availability of the Hessian of(More)
With the help of an in-band full-duplex relay station, it is possible to simultaneously transmit and receive signals from multiple users. The performance of such system can be greatly increased when the relay station is equipped with a large number of antennas on both transmitter and receiver sides. In this paper, we exploit the use of massive arrays to(More)
We address the problem of codebook design for the low signal-to-noise ratio (SNR) fast non-coherent MIMO block fading channel. The channel matrix is assumed deterministic (no stochastic model attached) and unknown at both the receiver and the transmitter. To handle the unknown deterministic space-time channel, a generalized likelihood ratio test (GLRT)(More)