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Skew and Slant Angles of Handwritten Signature

L. B. Mahanta, Alpana Deka

For any signature verification system, detection and correction of skew and slant angles are two important factors in preprocessing stage. To make an efficient verification system, the input signature image should be perfectly preprocessed as far as possible so that we can properly extract the required features. In correction of skew angle, attempt is made that word orientation of the signature is parallel to horizontal direction. On the other hand, in slant angle correction, operations are performed to make all the vertical strokes erect [1]. This paper presents three different approaches for detection of a signature’s skew angle. Also it is explained how a slant angle can be detected and corrected.