Development of a Character recognition system for Devnagari is difficult because (i) there are about 350 basic, modified (“matra”) and compound character shapes in the script and (ii) the characters in words are topologically connected. Here focus is on the recognition of offline handwritten Devnagari signatures that can be used in common applications like bank cheques, commercial forms, government records, bill processing systems, Postcode Recognition, Signature Verification, passport readers, offline document recognition generated by the expanding technological society. Challenges in handwritten signature recognition lie in the variation and distortion of handwritten signature or script since different people may use different style of handwriting, and direction to draw the same shape of any Devnagari character. This overview describes the nature of handwritten language, how it is translated into electronic data, and the basic concepts behind written language recognition algorithms. Handwritten Devnagari signatures are imprecise in nature as their corners are not always sharp, lines are not perfectly straight, and curves are not necessarily smooth, unlikely the printed character. An approach using Artificial Neural Network is considered for recognition of Handwritten Devnagari Signature. The learning process inherent in Neural Networks (NN) can be applied to the process of verifying handwritten signatures that are electronically captured via a stylus. This paper presents a method for verifying handwritten signatures by using NN architecture. Various static (e.g., area covered, number of elements, height, slant, etc.) (Plamondon & Srihari, 2000, p. 63-84) and dynamic (e.g., velocity, pen tip pressure, etc.) signature features are extracted and used to train the NN (Daramola & Ibiyemi, 2010, p. 48-52). Several Network topologies are tested and their accuracy is compared. Although the verification process can be thought to as a monolith component, it is recommended to divide it into loosely coupled phases (like preprocessing, feature extraction, feature matching, feature comparison and classification) allowing us to gain a better control over the precision of different components. This paper focuses on classification, the last phase in the process, covering some of the most important general approaches in the field. Each approach is evaluated for applicability in signature verification, identifying their strength and weaknesses. It is shown, that some of these weak points are common between the different approaches and can partially be eliminated with our proposed solutions. To demonstrate this, several local features are introduced and compared using different classification approaches.

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Offline Handwritten Devnagari Signature Recognition using Moment Invariant Analysis in Neural Network

Sandeep B. Patil*, Shailendra Dewangan**
* Senior Associate Professor, Deptt. of Electronics & Telecommunication, SSCET Bhilai, Chhattisgarh, India.
** M.E. Scholar (Communication), Deptt. of Electronics & Telecommunication, SSCET Bhilai, Chhattisgarh, India.
Periodicity:November - January'2012
DOI : https://doi.org/10.26634/jcs.1.1.1735

Abstract

Development of a Character recognition system for Devnagari is difficult because (i) there are about 350 basic, modified (“matra”) and compound character shapes in the script and (ii) the characters in words are topologically connected. Here focus is on the recognition of offline handwritten Devnagari signatures that can be used in common applications like bank cheques, commercial forms, government records, bill processing systems, Postcode Recognition, Signature Verification, passport readers, offline document recognition generated by the expanding technological society. Challenges in handwritten signature recognition lie in the variation and distortion of handwritten signature or script since different people may use different style of handwriting, and direction to draw the same shape of any Devnagari character. This overview describes the nature of handwritten language, how it is translated into electronic data, and the basic concepts behind written language recognition algorithms. Handwritten Devnagari signatures are imprecise in nature as their corners are not always sharp, lines are not perfectly straight, and curves are not necessarily smooth, unlikely the printed character. An approach using Artificial Neural Network is considered for recognition of Handwritten Devnagari Signature. The learning process inherent in Neural Networks (NN) can be applied to the process of verifying handwritten signatures that are electronically captured via a stylus. This paper presents a method for verifying handwritten signatures by using NN architecture. Various static (e.g., area covered, number of elements, height, slant, etc.) (Plamondon & Srihari, 2000, p. 63-84) and dynamic (e.g., velocity, pen tip pressure, etc.) signature features are extracted and used to train the NN (Daramola & Ibiyemi, 2010, p. 48-52). Several Network topologies are tested and their accuracy is compared. Although the verification process can be thought to as a monolith component, it is recommended to divide it into loosely coupled phases (like preprocessing, feature extraction, feature matching, feature comparison and classification) allowing us to gain a better control over the precision of different components. This paper focuses on classification, the last phase in the process, covering some of the most important general approaches in the field. Each approach is evaluated for applicability in signature verification, identifying their strength and weaknesses. It is shown, that some of these weak points are common between the different approaches and can partially be eliminated with our proposed solutions. To demonstrate this, several local features are introduced and compared using different classification approaches.

Keywords

Handwritten Devnagari Signature Recognition (HDSR), Neural Networks (NN), offline Method, Hu’s moment invariants, Zernike Moment Invariants etc.

How to Cite this Article?

Patil, S. B., and Dewangan, S. (2012). Offline Handwritten Devnagari Signature Recognition Using Moment Invariant Analysis In Neural Network. i-manager’s Journal on Communication Engineering and Systems, 1(1), 39-48. https://doi.org/10.26634/jcs.1.1.1735

References

[1]. Alexandra, B. (2002). Efficient threshold signature, multi-signature and blind signature schemes based on the Gap- Diffie -Hellman- group signature scheme. Proceedings of Department of Computer Science & Engineering, University of California at San Diego, California, USA. Retrieved from http://eprint.iacr. org/ 2002 /118.pdf
[2]. Alizadeh, A., & Daei, Z. (2010). Optimal Threshold Selection for Online Verification of Signature. Proceedings of the International Multi Conference of Engineers and Computer Scientists, (IMECS), 01, pp. 17-21.
[3]. Arica, N., Fatos T., & Vural, Y. (2001, May). An Overview of Character Recognition Focused on Off-line Handwriting. IEEE Trans. on System, Man and Cybernetics. Part C: Application and Reviews, 31 (2), pp. 216-233. Retrieved from http://www.mendeley.com/research/overviewcharacter- recognition-focused-offline-handwriting/
[4]. Baradi, V.A., & Kakere, H.B. (2010). Offline Signature Recognition System. International Journal of Computer Applications, 1 (27), pp. 48-56.
[5] Boyce, J.F., & Hossack, W.J. (1983). Moment Invariants for Pattern Recognition. Journal of Pattern Recognition, 1, pp. 451-456. Retrieved from http://www. sciencedirect. com/science/article/pii/0167865583900855
[6]. Chaudhari, B.M., Barhate, A., & Bhole, A. (2009, June). Signature Recognition Using Fuzzy Min-Max Neural Network. Proceeding of International Conference on Control Automation Communication & Energy Conversation, pp. 242-249. Retrieved from http://ieeexplore.ieee.org /xpl/ freeabs_all.jsp?arnumber=5204432
[7]. Chen, S., & Srihari, S. (2006). A New Off-line Signature Verification Method based on Graph Matching”, Proceedings of 18th International Conference on In Pattern Recognition, Hong Kong, China 6, pp. 869-872. Retrieved from http://www.citeulike.org/user/drivard/ article /899797
[8]. Daramola, S.A., & Ibiyemi, T.S. Efficient on-line signature verification system. International Journal of Engineering & Technology (IJET), 10 (4). pp. 48-52 Retrieved from http://www.ijens.org/107604-3737%20IJET-IJENS.pdf
[9]. Flusser, J., & Suk, T. (2006). Rotation Moment Invariants for Recognition of Symmetric Objects. IEEE Trans. of Image Processing, 15, pp. 3784–3790.
[10]. Henniger, O., & Franke, K. Biometric user authentication on smart cards by means of handwritten signatures. Fraunhofer Institute for Secure Tele-cooperation Rheinstr, Darmstadt, Germany Retrieved from http://zavir.sit.fraunhofer.de/HF04.pdf
[11]. Herdagdelen, A., & Alpaydm, E. (2004, June). Dynamic Alignment Distance Based Online Signature Verification. Proceedings of 13th Turkish Symposium on Artificial Intelligence & Artificial Neural Networks, Izmir, Turkey, 10 (11), pp. 119-127.
[12]. Hu, M.K. (1962). Visual Pattern Recognition by Moment Invariants. IRE Trans. of Information Theory, 8, pp. 179–187.
[13]. Jain, A., Griess, F., & Connell, S. (2010). On-line signature Verification: Pattern Recognition. WSEAS Transactions on Mathematics, 9 (8).
[14]. Kumar, S. (2010). An Analysis of Irregularities in Devanagari Script Writing – A Machine Recognition Perspective. International Journal on Computer Science and Engineering (IJCSE), 2 (2), pp. 274-279, Retrieved from http://www.enggjournals.com/ijcse/doc/IJCSE10-02-02- 30.pdf.
[15]. Kumar, S., & Singh, C. (2005). A Study of Zernike Moments and Its Use in Devnagari Handwritten Character Recognition. Proceedings of International Conference on Cognition & Recognition, Mandya (India), pp. 514-520.
[16]. Majumdar, A. (2007). Bangla Basic Character Recognition Using Digital Curvelet Transform. Journal of Pattern Recognition Research, 1, pp. 17-26. Retrieved from http://www.jprr.org/index. php/jprr/article /viewFile / 27 / 14
[17]. Martens, R., & Claesen, L. (1996). On- Line Signature Verification by Dynamic Time-Warping IEEE Proceedings of th 13 International Conference on Pattern Recognition (ICPR'96). pp. 903. Retrieved from 10.1109/ICPR. 1996. 547206.
[18]. Mautner, P., Rohlik, O., Matousek, V., & Kemp, J. (2002). Signature Verification Using Artificial Neural Network. Proceedings of the 9th International Conference on Neural information Processing (ICONIP'OZ), 2. pp. 636-639.
[19]. Nelson, W., Turin, W., & Hastie T. (1994). Statisticalmethods for on-line signature verification: International Journal of Pattern Recognition and Artificial Intelligence, 8.
[20]. Nelson, W., & Kishon, E. (1991, October). Use of Dynamic Features for Signature Verification. Proceedings of the IEEE International Conference on Systems, Man, and Cybernetics, Virginia, 1, pp. 201-205.
[21]. Parkar, J.R. Simple Distances between Handwritten Signatures. Laboratory for Computer Vision, Department of Computer Science, University of Calgary.
[22]. Plamondon, R., & Srihari, S.N. (2000). Online and Off-line Handwriting Recognition - A Comprehensive Survey. IEEE Trans. of Pattern Analysis & Machine Intelligence, 22 (1), pp. 63-84, Retrieved from h t t p : / / w w w . c e d a r . b u f f a l o . edu/papers/articles/Online_Offline_2000.pdf.
[23]. Radhika, K.R., Venkatesha, M. K. & Sekhar, G. N. (2010, February). On-line Signature Authentication. International Journal of Computer Science and Network Security (IJCSNS), 10 (2), pp. 12-18. Retrieved From http://paper.ijcsns.org/07_book/201002/20100203. pdf.
[24]. Ramteke, R.J. (2010). Invariant Moments Based Feature Extraction for Handwritten Devanagari Vowels Recognition. International Journal of Computer Applications, 1 (18), pp. 1-5. Retrieved from.
[25]. Srihari, S.N., Xu, A., & Kalera, M.K. (2004). Learning Strategies and Classification Methods for Off-line Signature Verification. Proceedings of the 9th International Workshop on Frontiers in Handwriting Recognition. Retrieved from http://rdg. ext. hitachi.co.jp/iwfhr9/AfterWS/IWFHR9-Proceedings /docs/027_x_Srihari-Learni.pdf.
[26]. Wang, L., & Healey, G. (1998). Using Zernike moments for the illumination and geometry invariant classification of multispectral Texture. IEEE Trans. Of Image Processing, 7, pp. 196-203.
[27]. Wu, Q.Z., Chang, J., & Lee, S.Y. (1997). On-Line Signature Verification Using LPC Cepstrum and Neural Networks. IEEE Transactions on Systems, Man, and Cybernetics Part B: Cybernetics, 27(1). pp.148-153.
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