Every recognition process is executed as concurrent jobs. Since a student is not forced to wait till the recognition is over, he/she can write other characters continuously. It enables quick response of the interface.
Figure 4: Progress of fraction writing and its concurrent recognition.
We evaluated elapsed time for recognizing a character and successful rate of recognition. The average elapsed time for 65 characters is 20.1 (ms). The successful rate for 104 characters is 91.3%. Those results show the system has enough practical performance.
We have developed a pen based interface using a pen X terminal for an ITS for guiding fraction calculation named as FRONTIER. We tried to develop a practical ITS. The results of the evaluation show the interface is practical enough. FRONTIER is a good example to apply a pen based interface to an educational systems.
Watanabe, K., Okazaki, Y., Tadaki, S. and Kondo, H., ( 1994). An Implementation of an ITS for Guiding Fraction Calculation. The Transactions of the Institute of Electronics, Information and Communication Engineers, Vol. J77-A, No. 3, 518-529 (in Japanese).
Okamoto, M., Yamamoto, H., Sawada, K. and Yamamoto, K., ( 1996). On-Line Handwriting Character String Separation Method Using Network Expression. Proc. of 13th International Conference on Pattern Recognition, Vol 4, Track D, 422-425.