Method and apparatus for quantifying visual showthrough of...

G - Physics – 06 – K

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G06K 9/00 (2006.01) G01N 21/00 (2006.01) G01N 21/84 (2006.01)

Patent

CA 2521857

An image analysis method and apparatus (10) having an imaging assembly (12) and a processor (14) to quantify visual showthrough of printed images on the reverse face of planar objects, such as paper. An illumination level is set using a white reference object. A white reference image is stored in a computer memory. An image of a planar object having a printed image on the reverse face is stored in a computer memory. A pixel by pixel ratio of the two images is calculated and a mean value of the ratios is calculated to characterize the visual showthrough. The measurements are substantially independent of both the illumination level and image shading.

L'invention concerne un procédé d'analyse d'image permettant de quantifier la présentation visuelle d'images imprimées sur l'envers d'objets planaires, tels que du papier. Un niveau d'éclairage est déterminé à l'aide d'un objet de référence blanc. Une image de référence blanche est stockée dans la mémoire d'un ordinateur. Une image d'un objet planaire présentant une image imprimée sur l'envers est stockée dans la mémoire d'un ordinateur. Un rapport pixel par pixel des deux images est calculé, et une valeur moyenne des rapports est calculée pour caractériser la présentation. Les mesures sont sensiblement indépendantes du niveau d'éclairage et de l'ombrage de l'image.

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