Java Based On-line Handwriting Interface for Mathematical Expression and Its Character Recognition Performance

Abstract: We have developed a Java based on-line handwriting interface for an ITS for guiding algebraic calculation. By using a pen, the interface, which provides handwriting character input, enables a student to write algebraic expressions easily and naturally. The function buttons contribute easy handwriting environment for mathematical expression. The interface recognizes handwriting characters concurrent with student’s writing. The interface can start symbol segmentation automatically according to stroke position relationship and time interval between strokes (Stroke Grouping). DDCPM method is used for character recognition. For recognition dictionary, we made stroke data collection and dictionary customization. From the evaluation experiment, we got the recognition rate 79 % for all characters (91 kinds of characters) and 90 % for restricted characters (34 kinds of characters used in high school algebra)