一种基于TDH的手绘图形方向识别方法

J4 ›› 2013, Vol. 35 ›› Issue (12): 141-145.

一种基于TDH的手绘图形方向识别方法

张友根1，吴玲达1,2，宋汉辰1

(1.国防科学技术大学信息系统工程重点实验室,湖南长沙 410073;2.装备学院重点实验室,北京 101416)

收稿日期:2012-07-04 修回日期:2012-09-11 出版日期:2013-12-25 发布日期:2013-12-25
基金资助:
国家自然科学基金资助项目（61103081）

A TDH-based orientation recognition method for sketched symbols

ZHANG Yougen1,WU Lingda1,2,SONG Hanchen1

(1.Science and Technology on Information Systems Engineering Laboratory,
National University of Defense Technology,Changsha 410073;
2.Key Laboratory,Academy of Equipment,Beijing 101416,China)

Received:2012-07-04 Revised:2012-09-11 Online:2013-12-25 Published:2013-12-25

摘要/Abstract

摘要：

在方向可变的手绘图形识别中，要使用对方向敏感的特征及识别方法，识别图形的方向是一个前提和关键性的问题。提出了一种基于切向直方图TDH特征的手绘图形方向识别方法，利用图形采样点集的局部切方向统计特征TDH描述手绘图形的笔画方向信息，通过TDH旋转匹配确定待识别图形的方向相对于模板图形方向的旋转角度，进而可将二者旋转对齐。在包含7类共52种点军标的手绘图形集上的实验结果表明，基于TDH的方法对超过80%的图形所得的方向识别角度误差在5°以内，识别速度满足交互实时性的要求，验证了本文方法的有效性。

关键词: 手绘图形, 方向识别, 切向直方图

Abstract:

In order to apply rotation sensitive features and recognition methods for recognizing rotatable sketched symbols, it is essential to recognize its orientation. A TDHbased orientation recognition method is proposed for sketched symbols. Tangent directions of resample points are extracted, and a histogram feature is constructed to carry directional information of the symbol’s strokes. The rotation angle between an unknown input symbol and a template symbol can be estimated by matching their TDH rotationally, and the input symbol can be adjusted to align with the template one subsequently. With an experiment on a set of 52 sketched courseofaction symbols, the results show that the error of rotation angle recognized by our method is less than 5° for over 80% of the tested symbols, and the recognition speed meets the real time requirements.

Key words: sketched symbols;orientation recognition;tangent direction histogram(TDH)

张友根1，吴玲达1,2，宋汉辰1. 一种基于TDH的手绘图形方向识别方法[J]. J4, 2013, 35(12): 141-145.

ZHANG Yougen1,WU Lingda1,2,SONG Hanchen1. A TDH-based orientation recognition method for sketched symbols [J]. J4, 2013, 35(12): 141-145.