System and method for automatic segmentation of vessels in...

G - Physics – 06 – T

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G06T 5/00 (2006.01)

Patent

CA 2617671

A method for segmenting digitized images includes providing (61) a digitized image, selecting (62) a point with a median enhancement greater than a predefined threshold, wherein a contrast enhancing agent was applied to the subject matter of said digitized image prior to acquisition of said image, defining (63) a shape matrix for the selected point in said image from moments of the intensities in a window of points about said selected point, calculating (64) eigenvalues of said shape matrix, determining (65) an eccentricity of a structure underlying said point from said eigenvalues, and segmenting (67) said image based on said eccentricity values, wherein the steps of defining a shape matrix, calculating eigenvalues of said shape matrix, and determining the eccentricity of the underlying structure are repeated (66) for all points in said image.

Procédé de segmentation d'images numériques consistant: à prendre (61) une image numérique; à sélectionner (62) un point dont l'accentuation médiane est supérieure à un seuil prédéterminé, un agent de contraste ayant été appliqué au domaine de ladite image numérique avant acquisition de cette image; à définir (63) une matrice de forme pour le point sélectionné de ladite image à partir de moments d'intensité dans une fenêtre de points autour du point sélectionné; à calculer (64) des valeurs propres de la matrice de forme; à déterminer (65) une excentricité d'une structure sous-jacente audit point à partir des valeurs propres; et à segmenter (67) ladite image en fonction des valeurs d'excentricité. Les opérations de définition de la matrice de forme, de calcul des valeurs propres de cette matrice et de détermination de l'excentricité de la structure sous-jacente sont répétées (66) pour tous les points de ladite image.

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