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Featured researches published by Pierre Imbaud.


Biomedical spectroscopy and imaging | 2015

Hyperspectral imaging applied to microbial categorization in an automated microbiology workflow

Denis F. Leroux; Rony Midahuen; Guillaume Perrin; Jeremie Pescatore; Pierre Imbaud

Hyperspectral imaging (HSI) is being evaluated as a pre-selection tool to categorize and localize populations of microbial colonies directly onto their culture medium, in order to facilitate the microbiology workflow downstream the incubation step. The categorization criteria were here limited to the diffuse radiance spectra acquired mostly in the visible region between 400 and 900 nm. Although the diffuse radiance signal is much broader than the one acquired using vibrational techniques such as Raman and IR and limited to chromophores absorbing in the visible region, it can be acquired very quickly allowing to perform hyperspectral imaging of large objects (i.e. Petri dishes) with throughputs that are compatible with the needs of a clinical laboratory workflow. Moreover, additional cost reduction could possibly be achieved using application-specific multispectral systems. Furthermore, recent research has shown that good power of discrimination, at the species level, could be achieved at least for a low level of species. In our work, we test different culture media, with and without a strong light absorption in the visible region, and report categorization results obtained when selecting end-member spectra according to a multi-parametric study (colonies, agar type). Results of categorization (e.g. at the species level) are presented using two types of supervised-categorization algorithms providing that they deliver subpixel fractional abundance information (Linear Spectral Unmixing type) or not such as Spectral Angle Mapping (SAM) and Euclidian Distance (ED) type. Interestingly the performance between the two classes of algorithms is dramatically different, a trend which is not always observed. An interpretation is proposed on the basis of the agar interference and the spectral purity of end-member spectra.


Archive | 2001

Valves activated by electrically active polymers or by shape-memory materials, device containing same and method for using same

Francis Garnier; Bernard Mandrand; Patrick Broyer; Pierre Imbaud


Archive | 1999

Microfluid system for reactions and transfers

Bruno Colin; Cecile Paris; Jacques Dachaud; Pierre Imbaud


Archive | 2002

Device for the capacitive measuring of a fill level

Patrick Broyer; Pierre Imbaud


Archive | 1996

Assembly for treating a sample in a liquid medium, in particular a biological material

Bruno Colin; Bernard Mandrand; Pierre Imbaud


Archive | 2001

Durch elektrisch aktive polymere oder durch materialien mit formgedächtnis aktivierte ventile, einrichtung damit und verfahren zu ihrer verwendung

Francis Garnier; Bernard Mandrand; Patrick Broyer; Pierre Imbaud


Archive | 2002

Dispositif pour la mesure capacitative d’un niveau de remplissage

Patrick Broyer; Pierre Imbaud


Archive | 2001

By electrically active polymeric or by shape-memory materials activated valves, so that device and method of use

Francis Garnier; Bernard Mandrand; Patrick Broyer; Pierre Imbaud


Archive | 2001

Durch elektrisch aktive polymere oder durch materialien mit formgedächtnis aktivierte ventile, einrichtung damit und verfahren zu ihrer verwendung By electrically active polymeric materials or shape memory activated valves, means it and proceed to their use

Francis Garnier; Bernard Mandrand; Patrick Broyer; Pierre Imbaud


Archive | 2001

Vannes activees par des polymeres electro-actifs ou par des materiaux a memoire de forme, dispositif contenant de telles vannes et procede de mise en oeuvre

Francis Garnier; Bernard Mandrand; Patrick Broyer; Pierre Imbaud

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Bernard Mandrand

École normale supérieure de Lyon

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Francis Garnier

Conservatoire national des arts et métiers

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