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POhow can we measure distance between object and android phone camera
 

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  1. POhow can we measure distance between object and android phone camera
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    <p>I want to calculate the distance between the camera and the recognized object.For this I tried a lot of methods, I tried to find the angle between the object and the camera using accelerometer and then use</p> <p>d = h * tan a</p> <p>h is height of from from the base generally which is 1.4</p> <p>and i tried to calculate the angle by using get orientation method. Kindly let me know where am I doing wrong. Its been more than 2 days I have been struggling with this requirement. We have looked into various Camera applications which are available on Android Store and have tried to understand the functionality of the same but nothing has been fruitful. </p> <pre><code> mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); accSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); magnetSensor = mSensorManager .getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD); @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { // TODO Auto-generated method stub } @Override public void onSensorChanged(SensorEvent event) { // TODO Auto-generated method stub if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) gravity = event.values; if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) geoMagnetic = event.values; if (gravity != null &amp;&amp; geoMagnetic != null) { float R[] = new float[9]; float I[] = new float[9]; boolean success = SensorManager.getRotationMatrix(R, I, gravity, geoMagnetic); if (success) { /* Orientation has azimuth, pitch and roll */ float orientation[] = new float[3]; //SensorManager.remapCoordinateSystem(R, 1, 3, orientation); SensorManager.getOrientation(R, orientation); azimut = 57.29578F * orientation[0]; pitch = 57.29578F * orientation[1]; roll = 57.29578F * orientation[2]; } } } captureButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // get an image from the camera double d = (Math.tan(Math.toRadians(Math.abs(pitch))) * sensorHeight); Toast.makeText( getApplicationContext(), "Distance = " + String.valueOf(d) + "m Angle = " + String.valueOf(Math.toRadians(Math.abs(pitch))), Toast.LENGTH_LONG).show(); } }); protected void onResume() { super.onResume(); mSensorManager.registerListener(this, accSensor, SensorManager.SENSOR_DELAY_NORMAL); mSensorManager.registerListener(this, magnetSensor, SensorManager.SENSOR_DELAY_NORMAL); } </code></pre>
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    1. COHow would the angle relate to the distance? What if I stand on a balcony? Also, how can you ever measure the distance if you don't know the dimensions of the captured object? Plus, how much lens and optical sensor density information do you use?
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    2. COThe purpose of the app to is find the distance between an object and the camera. Assuming both are standing on the same ground. We are not trying to measure the size of the object.
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    3. COAlso, you want to look at http://stackoverflow.com/q/4588485
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