A Java based on-line handwriting interface for an Intelligent Algebraic Calculation Tutoring System

This paper describes our on-line handwriting mathematical expression input interface for our Intelligent Algebraic Calculation Tutoring System (ACTS). It consists of a Java-based client, which receives user´s handwriting input and displays output, and a C-based server, which recognizes hand-written symbols. Our interface provides simple and easy mathematical expression input environment. Its distinctive features are automatic stroke segmentation based on spatial relationship and time intervals of consecutive strokes, symbol recognition based on DDCPM (Directional and Direction-Change Pattern Matching) method and function buttons that help user´s input and correction. Our experiment results show that the recognition rate is 79 % for 91 kinds of symbols and 90 % for 34 kinds of restricted ones for our target domain.