, 2.3 Separated unmixing and denoising (SUDN) method

. .. Unmixing,

.. .. Experimental-results,

.. .. Conclusion, 115 hyperspectral imagers, the surface area covered by any pixel of the image may contain different chemical materials characterized by their spectral response. Each pixel of a hyperspectral image is thus a mixture of several spectral signatures of different pure materials, called endmembers. Unmixing hyperspectral data aims at the estimating of the endmembers and their fractional abundances inside each pixel area

, CNRS. Il a été soutenu par le Fond Unique Interministériel (FUI) AAP 2015

T. Project and L. Le-conseil-régional-de, Il implique 3 partenaires industriels (Egger, Pellenc ST, Critt Bois) et deux partenaires académiques (CRAN, LCPME)

, elle vise à développer un système de tri automatique permettant d'intégrer une partie des déchets de bois comme bois brut dans la fabrication des panneaux de particules. Aujourd'hui, l'industrie des panneaux de particules recycle la plus grande partie des déchets de bois. L'industrie française des panneaux de particules est la deuxième plus importante en Europe derrière l'Allemagne qui, selon les données de 2011, produit environ 3 MT par année de panneaux de particules avec un taux moyen national de déchets de bois de 24% (7200000 T par année de déchets de bois récupérés, EGGER Panneaux & Décors

, Certains fabricants utilisent 100% de déchets au prix de panneaux de mauvaise qualité avec des limites d'utilisation. Le développement d'un système de tri des déchets de bois pour l'extraction du bois brut (avec un maximum de particules structurantes longues) permettra d'ajouter plus de déchets de bois aux panneaux tout en maintenant leur qualité mécanique. Pour donner quelques chiffres, à l'usine Ramberviller Egger, jusqu'à 40 tonnes de déchets de bois sont traités quotidiennement. La valorisation de 10 % de déchets en bois brut permet d'envisager la dépréciation d'un système de tri automatique de 1 Me en moins d'un an. Il est maintenant admis que la spectroscopie proche infrarouge (NIR) est une technologie pertinente pour analyser les matériaux du bois en général, Ces déchets de bois sont aujourd'hui partiellement triés dans les usines de panneaux. La limite du taux d'incorporation de ces déchets est directement liée à la préservation des caractéristiques mécaniques des produits finis

S. T. Pellenc and . Trispirabois, développé un système de tri industriel dont la principale caractéristique est d'inclure un système d'imagerie hyperspectrale NIR (voir Figure 1.1(b)) qui combine la puissance de la spectroscopie NIR et l'imagerie numérique. Du point de vue traitement de données, le projet Trispirabois s'est principalement concentré sur Chapter, Résumé étendu Les systèmes d'imagerie les plus utilisés sont les imageurs wiskbroom et pushbroom et nous proposons de développer des méthodes de traitement récursif des données tranche par tranche

C. Dans-ce, Alors que le traitement causal en temps réel des images hyperspectrales est reconnu comme un problème méthodologique important [Du09, Chang10, Chen14], la plupart des méthodes existantes (telles que la détection des anomalies, la classification, l'estimation des membres finaux) ne considèrent que des traitements sans mémoire. A l'opposé, le problème de déconvolution posé introduit une mémoire et nécessite de développer un traitement de données causales adapté aux systèmes, la récursion doit agir selon la dimension de balayage 1D y qui peut être assimilée au temps

, Microscopie spectrale

, L'imagerie hyperspectrale peut être appliquée à la microscopie pour permettre la capture et l'identification de différentes signatures spectrales d'échantillons à l'échelle nanométrique, comme les cellules et les bactéries

, La microscopie par imagerie hyperspectrale devient aujourd'hui une technique indispensable pour les sciences biologiques

, Parmi les différentes techniques spectroscopiques permettant de produire des images hyperspectrales, on peut citer la fluorescence

. Les-travaux-de, Hyperspectral Analysis and Enhanced Surface Probing of Representative bacteria-mineral Interaction) dont le but était d'étudier l'interaction des systèmes bactério-minéraux par des images hyperspectrales acquises selon différentes modalités optiques. L'acquisition et le traitement de données réelles concernent deux aspects : ? l'imagerie de bio-senseurs bacteriens microscopie confocale de fluorescence

, ? l'imagerie de minéraux et de composés chimiques en microscopie Raman confocale

, la physique, la chimie, la biologie et la médecine exige des améliorations instrumentales permettant de relever les défis de l'analyse submicrométrique. La question qui se pose est celle de la possibilité de surmonter les limites du système optique, L'intérêt croissant pour les nanosciences dans de nombreux domaines de recherche comme

. ?-l', approche par fusion de données dont le but est de produire une image haute résolution à partir de la fusion d'images basse résolution connaissant la distribution du bruit, l'opérateur de décimation, le flou et le décalage de la scène

, En se restreignat à la microscopie hyperspectrale, nous pouvons mentionner le travail de [Offroy10, Offroy12, Offroy15] qui a développé un dispositif d'acquisition pour obtenir des images à basse résolution et a évalué expérimentalement le gain en résolution des méthodes de super-résolution en microscopies

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