我正在尝试使用面部检测进行面部交换类型的应用程序。直到现在我得到位图中检测到的面孔并在检测到的面孔上绘制椭圆形。但现在我需要使用椭圆内的面，这样我就可以交换两个面。是否可以。我需要一些关于这方面的建议。
我的活动课如下
public class FaceDetectionActivity extends Activity
{
public MyView faceview;
public ImageView gallery;
private Uri imageURI;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
setContentView(R.layout.main);
faceview = (MyView)findViewById(R.id.faceview);
gallery=(ImageView)findViewById(R.id.gallery);
gallery.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
startActivityForResult(intent, 0 );
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if(requestCode==0){
imageURI = data.getData();
try {
Bitmap b = android.provider.MediaStore.Images.Media.getBitmap(getContentResolver(), imageURI);
faceview.myBitmap=b;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
faceview.invalidate();
}
faceview.invalidate();
} else {
System.exit(0);
Log.e("result", "BAD");
}
}
}
和我的视图类
public class MyView extends ImageViewTouchBase {
public RectF rectF;
public Bitmap myBitmap;
private int width, height;
private FaceDetector.Face[] detectedFaces;
private int NUMBER_OF_FACES=10;
private FaceDetector faceDetector;
private int NUMBER_OF_FACE_DETECTED;
private float eyeDistance;
Matrix mImageMatrix;
public MyView(Context context, AttributeSet attrs)
{
super(context, attrs);
BitmapFactory.Options bitmapFatoryOptions=new BitmapFactory.Options();
bitmapFatoryOptions.inPreferredConfig=Bitmap.Config.RGB_565;
myBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.familyportrait,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);
}
@Override
protected void onDraw(Canvas canvas)
{
if(myBitmap!=null)
{
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();
float left = midPoint.x - (float)(1.4 * eyeDistance);
float right = midPoint.x + (float)(1.4 * eyeDistance);
float top = midPoint.y - (float)(1.8 * eyeDistance);
float bottom = midPoint.y + (float)(1.8 * eyeDistance);
Rect imageRect = new Rect(0, 0, width, height);
rectF = new RectF();
rectF.set(left,top,right,bottom);
canvas.drawOval(rectF, myPaint);
}
}
}
现在我想要选择椭圆内的内容。请给我一些想法。