Estimation of the Text Skew in the Old Printed Documents
Keywords:convex hull, document image analysis, moment methods, optical character recognition, skew adjustment, vertical projection profiles.
Old printed documents represent the significant part of our heritage.Â In order to preserve them, the digitalization is indispensable. The paper proposedÂ a robust skew estimation method for old printed document. It is based on the connectedÂ components made by filled convex hulls around text element. The connectedÂ components are enlarged by oriented morphological operation. Then, the longest connectedÂ component is extracted. The global orientation of the document is detectedÂ by its orientation. Accordingly, document image was globally de-skewed. The algorithmÂ is tested on synthetic and real datasets. Obtained results proved the algorithms
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