Method and apparatus for correction of colour cast in a...

G - Physics – 06 – T

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G06T 5/00 (2006.01) G06F 3/14 (2006.01) G06T 7/40 (2006.01) H04N 1/60 (2006.01)

Patent

CA 2224865

The invention relates to a method and an apparatus for the analysis and correction of colour casts in a digitally represented image. According to a preferred embodiment, the crominance contents of the image may be transformed by use of a Hough-transformation or the like transformation, wherein the line structures in the carthesic system of co-ordinates for the crominance content is transformed to a representation in a Hough-diagram in the form of a polar system of co-ordinates, since such line structure is hereby transformed into a point structure. The Hough-diagram is examined with a view to finding a cell in the diagram which has the highest value and the cell found is saved. Subsequently cells are neutralized in the Hough-diagram within a predetermined angular distance, and the Hough-diagram is re-examined with a view to finding that diagram cell which, following neutralization, has the highest value. The cell found is saved and the cells saved which represent the maximae in the Hough-diagram are used to determine the intersecting points for lines in the crominance content system, and said intersecting points are used to evaluate the discolouration of the image.

Le procédé et l'appareil décrits servent à analyser et à corriger la prédominance d'une couleur primaire dans une image numérisée. Dans un mode préféré de réalisation, les composantes de chrominance de l'image peuvent être transformées par une transformation de Hough ou similaire. Les structures linéaires du système cartésien de coordonnées qui décrit les composantes de chrominance sont transformées en un diagramme de Hough sous forme d'un système polaire de coordonnées. La structure linéaire est donc transformée en une structure de points. On examine ensuite le diagramme de Hough afin de retrouver la cellule du diagramme qui a la valeur la plus élevée et on sauvegarde la cellule ainsi retrouvée. On neutralise ensuite les cellules dans le diagramme de Hough à une distance angulaire prédéterminée et on examine à nouveau le diagramme de Hough afin de trouver la cellule qui a la valeur la plus élevée après la neutralisation. On sauvegarde la cellule ainsi retrouvée et on utilise les cellules ainsi sauvegardées, qui représentent les valeurs maximales dans le diagramme de Hough, pour déterminer les intersections entre les lignes dans le système des composantes de chrominance, et on utilise ces intersections pour évaluer la décoloration de l'image.

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