我正在研究使用安卓手机中的传感器准确检测用户的脚步。我主要使用加速度计传感器来检测脚步。我使用了一种方法来获取加速度计数据并寻找一种方法来消除加速度计数据中不需要的噪声。我发现数据的线性化是一个很好的方法。但我不太清楚该怎么做。我认为它获得了中值。所以我没有找到一种实时获取中值的方法。谁能建议我一种更好的线性化方法来消除加速度计数据的噪声。
这是我的代码。(我使用 NChart 库在图表中绘制我的加速度计数据。)
package com.android.gait;
import org.achartengine.GraphicalView;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class MainActivity extends Activity implements SensorEventListener{
private int count=0;
private static GraphicalView view;
private LineGraph line = new LineGraph();
private static Thread thread;
private SensorManager mSensorManager;
private Sensor mAccelerometer;
TextView title,tv,tv1,tv2;
RelativeLayout layout;
private static Point p;
static float m = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//get the sensor service
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
//get the accelerometer sensor
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
//get layout
layout = (RelativeLayout)findViewById(R.id.relative);
LinearLayout layout = (LinearLayout) findViewById(R.id.layoutC);
view= line.getView(this);
layout.addView(view);
//get textviews
title=(TextView)findViewById(R.id.name);
tv=(TextView)findViewById(R.id.xval);
tv1=(TextView)findViewById(R.id.yval);
tv2=(TextView)findViewById(R.id.zval);
thread = new Thread(){
int iniX=0;
public void run()
{
while(true)
{
try {
Thread.sleep(1);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
iniX=+1;
line.addNewPoint(iniX,m);
view.repaint();
}
}
};
thread.start();
}
public final void onAccuracyChanged(Sensor sensor, int accuracy)
{
// Do something here if sensor accuracy changes.
}
@Override
public final void onSensorChanged(SensorEvent event)
{
count=+1;
// Many sensors return 3 values, one for each axis.
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
//get merged value
m = (float) Math.sqrt(x*x+y*y+z*z);
// p =MockData.getDataFromReceiver(count, m);
//display values using TextView
title.setText(R.string.app_name);
tv.setText("X axis" +"\t\t"+x);
tv1.setText("Y axis" + "\t\t" +y);
tv2.setText("Z axis" +"\t\t" +z);
}
@Override
protected void onResume()
{
super.onResume();
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause()
{
super.onPause();
mSensorManager.unregisterListener(this);
}
public void LineGraphHandler(View view){
}
}