Improved method for image binarization

G - Physics – 06 – T

Patent

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G06T 5/00 (2006.01) G06T 7/00 (2006.01)

Patent

CA 2397805

A method for binarizing a gray-level input image (20) including a plurality of pixels having respective gray-level values. A lower threshold and an upper threshold are determined. A first binary value is assigned to the pixels in the gray-level image having gray-level values above the upper threshold (64), and a second binary value is assigned to the pixels in the gray-level image having gray-level values below the lower threshold (62). The pixels in an intermediate group having gray-level values between the lower and upper thresholds are processed so as to determine optimal assignments of the pixels in the intermediate group to the first and second binary values (66).

L'invention concerne un procédé permettant de binariser une image (20) d'entrée à niveaux de gris comprenant plusieurs pixels ayant des valeurs de niveau de gris correspondants. On détermine un seuil inférieur et un seuil supérieur. Une première valeur binaire est attribuée aux pixels de l'image à niveaux de gris ayant des valeurs dépassant le seuil supérieur. Une seconde valeur binaire est attribuée aux pixels de l'image à niveaux de gris ayant des valeurs inférieures au seuil inférieur. Les pixels d'un groupe intermédiaire présentant des valeurs de niveau de gris se situant entre les seuils inférieur et supérieur sont traités de façon à déterminer des attributions optimales de pixels dans le groupe intermédiaire aux premières et secondes valeurs binaires.

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