Android Face Detection Example

In Android Sdk provide rich class called android.media.FaceDetector to identify the faces of people in a Bitmap graphic object.
In this below example we can see using FaceDetector how i find any people faces in Bitmap image .

Here below class i am using FaceDetector i can apply one rectangle shape to face.

Here i am using one image(aishwarya.png) that can be converted into Bitmap image
and Apply FaceDetection view on Image.and set that image to Activity View.

Note: Dont forget to place (aishwarya.png) in drawable folder.you can use your own image insted of (aishwarya.png) no problem .but u should you should use (yourpngfilename.png) insted of (aishwarya.png) in the below code

Android Activity(FaceDetectorActivity.java)

package com.androidsurya.facemodule;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PointF;
import android.media.FaceDetector;
import android.media.FaceDetector.Face;
import android.os.Bundle;
import android.view.View;

public class FaceDetectorActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new faceView(this));
}

private class faceView extends View {
// numberOfFace is for how many faces you want to find
private int numberOfFace = 1;
private FaceDetector faceDectect;
private FaceDetector.Face[] faceObj;
float eyesDistance;
int numberOfFacesDetected;
Bitmap bitmapImag;

public faceView(Context context) {
super(context);
// TODO Auto-generated constructor stub

BitmapFactory.Options BitmapFactoryOptionsbfo = new BitmapFactory.Options();
BitmapFactoryOptionsbfo.inPreferredConfig = Bitmap.Config.RGB_565;
bitmapImag = BitmapFactory.decodeResource(getResources(),
R.drawable.aishwarya, BitmapFactoryOptionsbfo);
faceObj = new FaceDetector.Face[numberOfFace];
faceDectect = new FaceDetector(bitmapImag.getWidth(),
bitmapImag.getHeight(), numberOfFace);
numberOfFacesDetected = faceDectect.findFaces(bitmapImag, faceObj);

}

@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub

canvas.drawBitmap(bitmapImag, 0, 0, null);

Paint myPaint = new Paint();
myPaint.setColor(Color.YELLOW);
myPaint.setStyle(Paint.Style.STROKE);
myPaint.setStrokeWidth(2);

for (int i = 0; i < numberOfFacesDetected; i++) {
Face face = faceObj[i];
PointF myMidPoint = new PointF();
face.getMidPoint(myMidPoint);
eyesDistance = face.eyesDistance();
canvas.drawRect((int) (myMidPoint.x - eyesDistance),
(int) (myMidPoint.y - eyesDistance),
(int) (myMidPoint.x + eyesDistance),
(int) (myMidPoint.y + eyesDistance), myPaint);
}
}
}
}

Register Android Activity in Android Manifest File

<activity
            android:name="com.androidsurya.facemodule.FaceDetectorActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

Output ScreenShot