G - Physics – 06 – K
Patent
G - Physics
06
K
G06K 9/38 (2006.01) G06T 5/40 (2006.01)
Patent
CA 2211258
A method and apparatus for thresholding gray-scale images containing text as foreground and dirt, colors, noise and the like as background. The method is adaptive in nature. The method uses multiple sets of thresholding process parameters in a contrast-based histogram evaluation to produce multiple candidate thresholded binary images. The method automatically selects the highest quality binary image, that is, the binary image that best represents text in the foreground, from among the multiple candidate binary images. The apparatus for implementing the method is a pipeline processor for highest speed.
Procédé et appareil de seuillage d'images de premier plan en grisé représentant du texte d'avec un fond de taches, de couleurs, de "bruit" ou autres. Ce procédé de nature adaptative recourt à de multiples ensembles de paramètres de processus de seuillage selon une évaluation d'histogrammes à base de contrastes, servant à produire de multiples images binaires candidates seuillées. Il sélectionne ensuite automatiquement parmi les multiples images binaires candidates celles de la meilleure qualité, c.-à-d. celles qui rendent le mieux le texte de premier plan. L'appareil de mise en oeuvre du procédé est un processeur pipeline à très haute vitesse.
Gorian Izrail S.
Moed Michael C.
Finlayson & Singlehurst
United Parcel Service Of America Inc.
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