Detection and correction of red-eye features in digital images

Details Detection and correction of red-eye features in digital images Detection and correction of red-eye features in digital images

G - Physics

06

T

G06T 7/00 (2006.01) H04N 1/62 (2006.01)

Patent

CA 2477087

A method of detecting red-eye features (1) in a digital image comprises identifying highlight regions (2) of the image having pixels with a substantially red hue and higher saturation and lightness values than pixels in the regions therearound. In addition, pupil regions (3) comprising two saturation peaks either side of a saturation trough may be identified. It is then determined whether each highlight or pupil region corresponds to part of a red-eye feature on the basis of further selection criteria, which may include determining whether there is an isolated, substantially circular area (43) of correctable pixels around a reference pixel. Correction of red-eye features involves reducing the lightness and/or saturation of some or all of the pixels in the red-eye feature.

L'invention concerne un procédé de détection du phénomène yeux rouges (1) dans une image numérique. Ce procédé consiste à identifier des régions (2) d'éclairage principal de l'image ayant des pixels d'une tonalité sensiblement rouge et présentant des valeurs de saturation et de clarté plus élevées que les pixels dans les régions qui l'entourent. De plus, les zones des pupilles (3) comprenant deux pics de saturation de chaque côté d'un minimum de saturation peuvent être identifiées. On détermine alors si chaque éclairage principal ou chaque zone des pupilles correspond à une partie du phénomène yeux rouges selon d'autres critères de sélection, qui peuvent consister à déterminer s'il y a une zone sensiblement circulaire isolée (43) de pixels pouvant être corrigés autour d'un pixel de référence. La correction du phénomène yeux rouges consiste à réduire la clarté et/ou la saturation de certains ou de tous les pixels dans le phénomène yeux rouges.

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