Handwritten character recognition using orientation quantization based on 3D accelerometer

Authors:
Shiqi Zhang;Chun Yuan;Yan Zhang
Affiliations:
Tsinghua University, Nanshan, Shenzhen, Guangdong, China and Harbin Institute of Technology, Nanshan, Shenzhen, Guangdong, China;Tsinghua University, Nanshan, Shenzhen, Guangdong, China;Harbin Institute of Technology, Nanshan, Shenzhen, Guangdong, China
Venue:
Proceedings of the 5th Annual International Conference on Mobile and Ubiquitous Systems: Computing, Networking, and Services
Year:
2008

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Abstract

This paper presents an online handwritten character recognition system. The whole system includes three parts: acceleration signal detection, signal processing and recognition by Hidden Markov Model (HMM). In hardware aspect, a mini-board with a three-dimensional accelerometer and a microcontroller is used to get real time acceleration values and send them to a terminal continuously. After effective section extraction and lowpass filtering, different quantizing methods based on acceleration orientation are used to quantize numerous data into small integral vectors. At last, we use HMM to do the recognition. For the experiments with 10 Arabic numerals, this system shows a high Recognition Rate (R.R.) of 94.29% in the database of 42 models for every Arabic numeral. This system could be used to reduce the size of handheld devices by discarding number keys and make human computer interaction more convenient and interesting.