小波阈值滤波matlab代码-Fall-Detector:(Android应用程序)使用手机的内置加速度传感器的FallDetector应用程

上传者: 38678498 | 上传时间: 2021-06-08 17:51:14 | 文件大小: 2.7MB | 文件类型: ZIP
小波阈值校正matlab代码堕落者 使用手机的内置加速度传感器创建Fall Alerter应用程序。 如果发生跌倒,用户可能会失去意识并可能需要外部帮助,因此该应用程序会通过SMS通过跌倒位置的GPS数据向护理人员发出警报。 UI包含一个图形,该图形显示了电话的加速度数据和紧急联系人列表。 如果它检测到跌倒,则将开始倒计时10秒钟,最后,将提醒紧急联系人列表。 用户可以关闭警报,如果它是错误警报或尽管跌倒也不需要帮助。 该应用程序的演示如下。 下图显示了坠落事件期间的加速度变化。 每个秋天事件都有其鲜明的特点。 手机跌落时,加速度计值开始减小。 当自由落体事件结束并且发生对地面的撞击时,我们将观察到突然的尖峰。 测试表明,在跌倒事件中观察到类似的变化。 Sensor API使用三维坐标系。 加速度计的值是通过将每个尺寸的平方求和,然后求和并求平方根来计算的。 通过这样做,我们获得了矢量方向的大小。 手机处于静止状态时,加速度值约为9.8 m / s ^ 2。 跌倒检测算法 离散小波变换用于提取要与输入加速度数据进行比较的特征向量。 选择具有32个采样点的母小波作为Meyer小波,从中获

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