Professional AssociationsProfessional Associations: IEEE | IEEE Signal Processing Society
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Matthieu's research work takes root in a multidisciplinary environment at the frontier between signal processing, statistics and applied mathematics. He is notably interested in the sensing, processing and estimation of Gaussian random fields with sensor arrays. Among the various applications investigated by Matthieu as part of his work, one counts: medical imagery, radio-astronomy, sound localisation, wireless networks... Some are listed below.
Flexarray is a method for designing phased-arrays according to a given, analytically-specified, target beamshape. Building on the flexibeam framework, antenna locations are sampled from a probabilistic density function. Naturally scalable with the number of antennas, it is also computationally efficient and numerically stable, as it relies on analytical derivation. Under mild conditions, the achieved beamshapes converge uniformly to the target beamshapes as the number of antennas increases.
Sinobeam is a beamforming technique for Positron Emission Tomography (PET) data. The beamforming weights are sampled from an analytically-specified beamforming function. The focused beamformer can be used for imaging purposes by scanning the imaging domain. The resulting imaging algorithm is extremely efficient, while presenting better resolution and contrast than state of the art methods.
Sound Field Recovery
The Bluebild algorithm was also tested for recovering the ambient acoustic field from the Pyramic array, a 48 microphone array developed at EPFL. A real-time demo (see video below) was designed and presented at the IEEE International Conference on Acoustics and Audio Processing (ICASSP).