Offline Verification for Handwritten Signatures Using Chain Code

Offline Verification for Handwritten Signatures Using Chain Code

Anis Ismail (Lebanese University, Lebanon) and Aziz M. Barbar (American University of Science & Technology, Lebanon)
Copyright: © 2015 |Pages: 11
DOI: 10.4018/978-1-4666-5888-2.ch139
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Background

Many systems have been implemented for signature verification. Ahmed et al. (Abdelrahman et al., 2013) presented an offline signature verification system using support vector machine technique. Global features are extracted from the signatures using radon transform. For each registered user in the database system, several reference signatures are enrolled and aligned for statistical information extraction about his/her signature. Dynamic time warping algorithm is used to align two signatures. During support vector machine classifier training, many genuine and forged signatures are chosen. A signature’s verification is established by first aligning it with each reference signature for the claimed user. The signature is then classified as genuine or forgery, according to the alignment scores which are normalized by reference statistics, using standard pattern classification techniques. Using a database of 2250 signatures (genuine signatures and skilled forgeries) from 75 writers in the proposed signature verification system, a performance of approximately 82% is achieved.

Key Terms in this Chapter

Image Processing: The analysis of a picture using techniques that can identify shades, colors and relationships that cannot be perceived by the human eye. Image processing is used to solve identification problems.

Signature Recognition: Biometric identification by automatically scanning a person's signature and matching it electronically against a library of known signatures.

Divide-and-Conquer (D&C): An important algorithm design paradigm based on multi-branched recursion. A divide and conquer algorithm works by recursively breaking down a problem into two or more sub-problems of the same (or related) type, until these become simple enough to be solved directly. The solutions to the sub-problems are then combined to give a solution to the original problem.

Handwritten Signature: A description of someone's name, nickname, which a person writes on documents as a proof of identity and intent.

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