基于文字书写教学的字母连写笔画分析方法

摘要

字母连写智能指导是文字书写教学系统重要研究内容。针对字母连写笔画结构复杂多变，单体字母书写笔迹分析方法无法直接套用于字母连写笔画分析的现状，提出基于图域时域关键点分割笔画的字母连写笔画分析方法。分别从图域、时域提取关键点；融合两域关键点；按二次曲线等三类标准曲线笔段，在两域关键点向量中进行笔段分割；通过与三类标准曲线的拟合建立笔段系数向量模板；依据实写笔画的各类关键点与系数向量重构的拟合曲线的贴近度实现连写笔画分析。实验表明，该方法关键点误提率、笔段误提率、实时跟踪时间及贴近度等重要指标均满足实用要求。%Intelligent guidance of letter ligatures is an important research content of characters handwriting tutoring system.The stroke structures of letter ligatures are complicated and changeable,the analysis method of single letter handwriting chirography can’t be directly set for letter ligatures strokes analysis.Aiming at this status quo,in this paper we propose a method of letter ligature strokes analysis,which is based on stroke-segmentation of key points in diagram-temporal domain.It is consisted of the following techniques:to extract key points from diagram and temporal domains respectively;to integrate the key points in two domains,according to three kinds of standard curved stroke seg-ments such as quadratic curve etc.to divide the stroke segments in vectors of key points in two domains;to set up stroke segments coefficient vector template by fitting with three kinds of standard curves;to realise the ligature strokes analysis according to the closeness of the fitting curves reconstructed by the various key points of actual handwritten strokes and the coefficient vectors.Experiment demonstrates that the im-portant indexes of the proposed method,including key points error pen-lifting rate,stroke segments error pen-lifting rate,real-time tracking time and closeness,etc.,all satisfy the practical requirement.