Here we go with the
example of Face Detaction in android.
It is pretty much simpler then I expected.
It is pretty much simpler then I expected.
1) Create a project… name it FaceDetection
2) Create A class FaceDetectionActivity.java
2) Create A class FaceDetectionActivity.java
In your onCreate method write setContentView(new
MyView(this)); after call to super.
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
setContentView(new
MyView(this));
}
public MyView(Context context)
{
super(context);
BitmapFactory.Options
bitmapFatoryOptions=new BitmapFactory.Options();
bitmapFatoryOptions.inPreferredConfig=Bitmap.Config.RGB_565;
myBitmap=BitmapFactory.decodeResource(getResources(),
R.drawable.faceswapping,bitmapFatoryOptions);
width=myBitmap.getWidth();
height=myBitmap.getHeight();
detectedFaces=new
FaceDetector.Face[NUMBER_OF_FACES];
faceDetector=new
FaceDetector(width,height,NUMBER_OF_FACES);
NUMBER_OF_FACE_DETECTED=faceDetector.findFaces(myBitmap,
detectedFaces);
}
Let me explain the constructor…
·
For FaceDetection we need to convert in bitmap
format that too in RGB_565.
·
Now get the image from the drawable folder. Get
the width and height of image.
·
Now the reason I feel this API the simplest is
coming now.
·
You need to pass the number of faces you want to
detect.It will return the array of Face type.Last three lines is having logic
for that.So you must declare an array with the size of number of faces you want
to detect.
Now when the face gets
detected we will draw a red rectangle on it.For that we need to write few lines
in our onDraw method.
@Override
protected void onDraw(Canvas canvas)
{
canvas.drawBitmap(myBitmap,
0,0, null);
Paint
myPaint = new Paint();
myPaint.setColor(Color.GREEN);
myPaint.setStyle(Paint.Style.STROKE);
myPaint.setStrokeWidth(3);
for(int
count=0;count<NUMBER_OF_FACE_DETECTED;count++)
{
Face
face=detectedFaces[count];
PointF
midPoint=new PointF();
face.getMidPoint(midPoint);
eyeDistance=face.eyesDistance();
canvas.drawRect(midPoint.x-eyeDistance,
midPoint.y-eyeDistance, midPoint.x+eyeDistance, midPoint.y+eyeDistance,
myPaint);
}
}
* drawRect is taking five parameter left x,y and top x,y
coordinate.From that given pint it will start drawing rectangle.We need to pass
paint object also.
Find working example in and attachment.