, Notons que le rendu esthétique de certaines singularités est plus ou moins apprécié
, quelques irrégularités naturelles du bois sont visibles dont les aubiers
,
, Nous pouvons citer : ? Discoloration : elle est dueà une réaction chimique qui s'opère généralement lors du séchage du bois (suiteà un vernissage ouà l'application d'une peinture). Les tannins (substances végétales présentes dans le bois), migrent vers la surface, se transforment chimiquement et brunissent, Nous avons relevé, sur les neuféchantillons, un total de douze singularités
est la partie poreuse et blanchâtre située entre le bois dur et l'écorce d'un arbre. Il est courant que l'aubier réagisse avec la finition appliquée sur le bois, générant en surface des lignes blanches plus ou moins importantes ,
, ? Trace baguette : générée par le support où le bois est empilé et stocké
, ? Veine foncée : le veinage est plus ou moins foncé en fonction des essences. Il correspond aux ? lignes ? que l'on peut observer sur le parquet. Pour un parquet en chaîne clair, ce qui est le cas ici, les veines foncées ne sont pas désirées, vol.4
le noeud est une modification de la structure du bois liéeà l'existence d'une branche ,
, Le noeud est parfaitement englobé dans le reste de la surface, auquel il a une bonne adhérence
, ou noir) : il est issu d'une branche morte
ou pourri) : on parle de noeud vicieux lorsque ses tissus sont affectés par la pourriture. Le plus souvent, ce dernier apparaît lors d'une infiltration d ,
regroupement de petits noeuds sains en grappes. Ce type de noeud est souvent recherché pour son aspect décoratif ,
, Ces motifs ne sont présents que sur les planches débitées aux plus près du diamètre de la bille de bois (les planches dites ? de quartier ?)
elle peutêtre causée par le vieillissement du bois, la sécheresse, le froid ou encore lors d'un choc ,
,
, Démélange hyperspectral en-ligne 111
, Démélange hyperspectral en-ligne
, Dans cette section, nous avons mené plusieurs expériences sur les neuf images hyperspectrales de bois
, L'objectif principal est d'étudier la capacité de nos algorithmesà détecter les singularités présentées ci-dessus. Nous proposons d'organiser la phase de démélange hyperspectral en-ligne et d'analyse des résultats en troisétapes
, ? La premièreétape consiste en l'utilisation de l'algorithme OMDC-ADMM en tant que phase d'apprentissage. Le but est d'apprendre les signatures spectrales et de constituer une bibliothèque
, ? La deuxièmeétape est l'utilisation de l'algorithme OSS-ADMM avec les sources préalablement apprises sur l'ensemble deséchantillons
, ? La dernièreétape présente la segmentation des cartes d'abondance obtenues par OSS-ADMM, par la méthode des k-means, afin d'observer le regroupement des pixels ayant les mêmes propriétés spectrales
, Traitement des pièces de boisà l'aide de OMDC-ADMM
, Ceciétant, la bibliothèque hyperspectrale retenue est issue du traitement d'un seuléchantillon de bois. Pour l'ensemble des données, les paramètres relatifsà OMDC-ADMM ontété fixés de la manière suivante : N iter = 30, ? = 0.99, µ = 2 et ? = 0.001. Le nombre de endmembersà extraire aété fixéà R = 3 ; divers essais en amont n'ont pas montré l'intérêt d'en estimer davantage, OMDC-ADMM aété appliqué sur l'ensemble des images hyperspectrales de bois
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