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- Peter N. Belhumeur, João Pedro Hespanha, David J. Kriegman
- IEEE Trans. Pattern Anal. Mach. Intell.
- 1996

We develop a face recognition algorithm which is insensitive to large variation in lighting direction and facial expression. Taking a pattern classification approach, we consider each pixel in an image as a coordinate in a high-dimensional space. We take advantage of the observation that the images of a particular face, under varying illumination but fixed… (More)

We develop a face recognition algorithm which is insensitive to gross variation in lighting direction and facial expression. Taking a pattern classi cation approach, we consider each pixel in an image as a coordinate in a high-dimensional space. We take advantage of the observation that the images of a particular face, under varying illumination but xed… (More)

- João Pedro Hespanha, Payam Naghshtabrizi, YongGang Xu
- Proceedings of the IEEE
- 2007

| Networked control systems (NCSs) are spatially distributed systems for which the communication between sensors, actuators, and controllers is supported by a shared communication network. We review several recent results on estimation, analysis, and controller synthesis for NCSs. The results surveyed address channel limitations in terms of packet-rates,… (More)

It is shown that switching among stable linear systems results in a stable system provided that switching is “slow-on-the-average.” In particular, it is proved that exponential stability is achieved when the number of switches in any finite interval grows linearly with the length of the interval, and the growth rate is sufficiently small. Moreover, the… (More)

- Payam Naghshtabrizi, João Pedro Hespanha, Andrew R. Teel
- Systems & Control Letters
- 2008

We establish exponential stability of nonlinear time-varying impulsive systems by employing Lyapunov functions with discontinuity at the impulse times. Our stability conditions have the property that when specialized to linear impulsive systems, the stability tests can be formulated as Linear Matrix Inequalities (LMIs). Then we consider LTI uncertain… (More)

- João Pedro Hespanha
- IEEE Trans. Automat. Contr.
- 2004

This paper addresses the uniform stability of switched linear systems, where uniformity refers to the convergence rate of the multiple solutions that one obtains as the switching signal ranges over a given set. We provide a collection of results that can be viewed as extensions of LaSalle’s Invariance Principle to certain classes of switched linear systems.… (More)

- Raghuraman Mudumbai, João Pedro Hespanha, Upamanyu Madhow, Gwen Barriac
- IEEE Transactions on Information Theory
- 2010

The concept of distributed transmit beamforming is implicit in many key results of network information theory. However, its implementation in a wireless network involves the fundamental challenge of ensuring phase coherence of the radio frequency signals from the different transmitters in the presence of unknown phase offsets between the transmitters and… (More)

- João Pedro Hespanha, A. Stephen Morse
- Automatica
- 2002

This paper deals with the problem of switching between several linear time-invariant (LTI) controllers—all of them capable of stabilizing a specific LTI process—in such a way that the stability of the closed-loop system is guaranteed for any switching sequence. We show that it is possible to find realizations for any given family of controller transfer… (More)

In this paper we develop a probabilistic framework for pursuit-evasion games. We propose a “greedy” policy to control a swarm of autonomous agents in the pursuit of one or several evaders. At each instant of time this policy directs the pursuers to the locations that maximize the probability of finding an evader at that particular time instant. It is shown… (More)

We introduce the concept of matrix-valued effective resistance for undirected matrix-weighted graphs. Effective resistances are defined to be the square blocks that appear in the diagonal of the inverse of the matrix-weighted Dirichlet graph Laplacian matrix. However, they can also be obtained from a “generalized” electrical network that is constructed from… (More)