Degraded character image restoration

Details Degraded character image restoration Degraded character image restoration

G - Physics

06

K

G06K 9/62 (2006.01) G06K 9/44 (2006.01) G06K 9/80 (2006.01)

Patent

CA 2201557

The present invention provides a method useful in image recognition by employing the restoration of degraded images to produce an approximation of the original ideal artwork for the image. That is, pursuant to the invention, a set of images is read from an image source and an attempt is made to recover, or closely approximate, the ideal artwork (e.g., original symbol) from which the images were derived. The approximation of the original symbol then serves to train an imageclassifier thereby increasing the effectiveness of the classifier. For example, the classifier can use the original symbol approximations as input to a degradation model to produce a set of degraded images useful in document classification. Thus, the effectiveness of the classifier is enhanced through the reduction in the classification error rate.

Méthode utile en reconnaissance d'images selon laquelle des images dégradées restaurées servent à produire une approximation de l'illustration idéale d'origine de l'image. La présente invention permet de lire une série d'images à partir d'une source d'images et de tenter de retrouver les illustrations idéales (par ex. le symbole d'origine) ou d'en obtenir une approximation la plus fidèle possible à partir desquelles les images ont été dérivées. L'approximation du symbole d'origine sert à entraîner un analyseur d'images afin d'en accroître l'efficacité. Par exemple, l'analyseur peut se servir des approximations du symbole d'origine comme données pour établir un modèle de dégradation permettant de produire une série d'images dégradées pouvant servir à la classification de documents. L'efficacité de l'analyseur est accrue en raison de la réduction du taux d'erreur de classification.

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