Method and apparatus for connected and degraded text...

G - Physics – 06 – K

Patent

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G06K 9/62 (2006.01)

Patent

CA 2185827

The present invention provides a method and apparatus for enhancing and recognizing connected and degraded text. The enhancement process comprises filtering a scanned image to determine whether a binary image value of an image pixel should be complemented, determining whether complementing the value of thepixel reduces the sharpness of wedge-like figures in the image, and complementing the binary value of the pixel when doing so does not reduce sharpness. The recognition process may comprise determining primitive strokes in a scanned image, segmenting the scanned image into sub-character segments based on the primitive strokes, identifying features which characterize the sub-character segments, andcomparing identified features to stochastic models of known characters and determining an optimum sequence of known characters based on the comparisons through the use of Viterbi scoring and level building procedures.

Méthode et appareil permettant d'améliorer et de reconnaître du texte relié et du texte altéré. Le processus d'amélioration comprend le filtrage d'une image balayée afin de déterminer si une valeur d'image binaire d'un pixel d'une image devrait être complétée, de déterminer si le complément de la valeur du pixel diminue la netteté des figures en forme de coins de l'image, et complémenter la valeur binaire du pixel lorsque cela ne diminue pas la netteté. Le processus de reconnaissance peut comprendre ce qui suit : déterminer les traits primitifs dans l'image balayée, segmenter l'image balayée en segments de caractères en fonction des traits primitifs, déterminer les caractéristiques des segments de sous-caractères et comparer les caractéristiques déterminées à des modèles stochastiques de caractères connus puis déterminer une séquence optimale de caractères connus en fonction des comparaisons au moyen de la notation de Viterbi et de procédures de construction de niveaux.

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