摘要
提出了一种基于微加速度传感器与微角速度传感器的空间笔迹检测系统,并对轨迹检测系统的算法进行了描述。手写动态采集系统使用安装于手写笔上的加速度传感器和角速度传感器采集手写笔的动态信息,通过A/D转换将得到的数据由串行通信接口传送至计算机进行处理。该系统可用于检测手写笔在三维空间的运动轨迹,并通过三维空间的姿态角变换矩阵将手写笔动态信息投影到二维坐标平面,经过一系列积分运算最终重现笔迹信息。介绍了手写笔运动过程中重力加速度对笔迹重现的影响以及从检测到的加速度中剔除重力加速度得到纯净运动加速度的方法,对传感器的标定进行了相应的说明。实验结果表明,该系统达到了预期的效果。
A handwriting detecting system based on micro-accelerometers and micro-gyros is proposed, and the algorithm of the detecting system is also described in detail. The micro-accelerometers and mi- cro-gyros mounted on the pen are used in this dynamic handwriting acquisition system to acquire the dynamic information, and obtained data are transmitted to computer for data processing and feature analysis through a serial port after A/D conversion. The motion track of the pen in the 3-D space can be recognized through computing the matrix of attitude angles and the dynamic information of the pen is mapped on the 2-D plane. Then, the information of handwriting can be recurred on the writing plane by an integral. Finally,this paper introduces the influence of gravity acceleration on the handwriting recurrence in the movement of the pen,gives a solution to get pure movement acceleration from the gravity acceleration detected by the micro-accelerometer,and describes the sensor calibration method. Experimental results prove the designed system to be feasible.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2009年第6期1286-1292,共7页
Optics and Precision Engineering
基金
Supported by Siemens China Research Center(Grant No .40001014200611)
