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本文利用加速度传感器实现电子手写输入功能,阐述了手写电子笔软件部分的实现。结合运动学原理,通过对采集的动态数据消除趋势项、小波降噪处理,经两次梯形时域积分得到其空间运动轨迹。在此基础上用VC++6.0设计了一个具备呈现三轴的原始波形、加速度、速度、位移波形以及三维立体轨迹的操作界面。实践结果表明,该方法有效的实现了无手写板手写轨迹的复现,从成本、体积、精度方面综合考虑,都具有一定优势。此外,也可以采用此方法对加速度传感器测量的各种振动信号进行预处理。
In this paper, the use of accelerometer sensor electronic handwriting input function, described the realization of the handwritten stylus software. Combined with the kinematics principle, the spatial motion trajectories are obtained by eliminating the trend items and the wavelet denoising processing of the collected dynamic data, and integrating the trapezoidal time domain twice. On this basis, we designed an operation interface with VC ++ 6.0 to show the original three-axis waveform, acceleration, velocity, displacement waveform and three-dimensional trajectory. The practice results show that this method can effectively realize the handwriting track reproduction without handwriting, and has some advantages from the aspects of cost, volume and accuracy. In addition, this method can also be used to pre-process various vibration signals measured by the acceleration sensor.