Thumwarin, Pitak

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Thumwarin, Pitak
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Thumwarin, P.
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pitak.th@kmitl.ac.th

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    On-line writer identification system characterizing velocity and areal velocity in handwriting process
    (2009-12-01)
    Matsuura, Takenobu
    ;
    Thumwarin, Pitak
    In this paper,we propose an on-line writer identification system characterizing velocity and areal velocity of pen-tip movement in handwriting process. The writer identification system consists of two finite impulse response (FIR) systems characterizing the velocity and areal velocity in handwriting process. Individual handwriting feature is represented by the impulse response of the FIR system. Writer can be identified by evaluating the difference between the impulse responses of the FIR systems for the reference and a person to be identified. In our experiments 2,000 Thai numerals were used to identify 10 different writers.
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    On-line writer identification based on handwriting velocity and curvature of script
    (2008-12-01)
    Matsuura, T.
    ;
    Thumwarin, P.
    ;
    Kato, N.
    We propose an on-line writer identification method based on the handwriting velocity and curvature of script. First, we calculate the autocorrelation functions for the normalized handwriting velocity and the normalized curvature of script, respectively. Secondly, we realize a finite impulse response (FIR) system having the Fourier coefficients of the obtained autocorrelation functions as the input and output, respectively. The realized FIR system can characterize the relation between the handwriting velocity and curvature of script. Writer can be identified by evaluating the difference between the impulse responses of the FIR systems for the writer and the reference. Finally, writer identification experiments are given to show the effectiveness of the proposed method. © 2008 IEEE.
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    On-line writer identification method based on FIR system characterizing pen-tip movement
    (2008-12-01)
    Matsuura, Takenobu
    ;
    Thumwarin, Pitak
    In this paper on-line writer identification problem is reduced to FIR system identification problem. Then person can be identified by evaluating the difference between the impulse responses of the FIR system for the reference and the person to be identified. The FIR system is realized by considering the DCTs of the horizontal and vertical components of the pen-tip movement with reduced fluctuation as the input and output,respectively. Finally, writer identification experiments are given to show the effectiveness of the proposed method. Copyright © 2008 by Department of Electronics, AGH University of Science and Technology.