Method of identifying endmember spectral values from...

G - Physics – 06 – K

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G06K 9/00 (2006.01) G01J 3/28 (2006.01) G01N 21/27 (2006.01) G01N 21/35 (2006.01) G01V 9/00 (2006.01) G06K 9/46 (2006.01) G01N 21/64 (2006.01) G06F 19/00 (2006.01)

Patent

CA 2478900

A method of identifying endmember spectral values from multispectral image data, where each multispectral data value is equal to a sum of mixing proportions of each endmember spectrum. The method comprises the steps of processing the data to obtain a multidimensional simplex having a number of vertices equal to the number of endmembers. The position of each vertex represents a spectrum of one of the endmembers. Processing the data is conducted by providing starting estimates of each endmember spectrum for each image data value. The mixing proportions for each data value is estimated from estimates of the spectra of all the endmembers. The spectrum of each endmember is estimated from estimates of the mixing proportions of the spectra of all the endmembers for each image data value. The estimation steps are repeated until a relative change in the regularised residual sum of squares is sufficiently small. The regularised residual sum of squares includes a term which is a measure of the size of the simplex.

L'invention concerne un procédé permettant d'identifier des valeurs spectrales de pôles à partir de données d'images multispectrales, chaque valeur de donnée multispectrale étant égale à une somme de proportions de mélange de chaque spectre de pôle. Ledit procédé consiste à traiter les données afin d'obtenir un simplexe multidimensionnel comprenant un certain nombre de vertex égaux au nombre de pôles. La position de chaque vertex représente le spectre de l'un des pôles. Le traitement des données s'effectue par fourniture d'estimations de départ de chaque spectre de pôle pour chaque valeur de donnée d'image. Les proportions de mélange pour chaque valeur de donnée sont estimées à partir des estimations du spectre de tous les pôles. Le spectre de chaque pôle est estimé à partir des proportions de mélange du spectre de tous les pôles pour chaque valeur de donnée d'image. Les phases d'estimation se répètent jusqu'à ce qu'un changement relatif dans la somme résiduelle régularisée soit suffisamment petit. La somme résiduelle régularisée des carrés comprend un terme qui correspond à une mesure de la taille du simplexe.

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