Face_Detection_Sample.pdf

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Face_Detection_Sample.java
class
Face_Detection_View
extends
View {
private static final int
MAX_FACES
= 10;
private static final
String
IMAGE_FN
=
"face.jpg";
private
Bitmap
background_image;
private
FaceDetector.Face[]
faces;
private int
face_count;
// preallocate for onDraw(...)
private
PointF
tmp_point
=
new
PointF();
private
Paint
tmp_paint
=
new
Paint();
public
Face_Detection_View(Context context) {
super(context);
// Load an image from SD Card
updateImage(Environment.getExternalStorageDirectory() +
"/"
+
IMAGE_FN);
}
public void
updateImage(String image_fn) {
// Set internal configuration to RGB_565
BitmapFactory.Options bitmap_options =
new
BitmapFactory.Options();
bitmap_options.inPreferredConfig = Bitmap.Config.RGB_565;
background_image
= BitmapFactory.decodeFile(image_fn, bitmap_options);
FaceDetector face_detector =
new
FaceDetector(
background_image.getWidth(), background_image.getHeight(),
MAX_FACES);
faces
=
new
FaceDetector.Face[MAX_FACES];
// The bitmap must be in 565 format (for now).
face_count
= face_detector.findFaces(background_image,
faces);
Log.d("Face_Detection",
"Face Count: "
+ String.valueOf(face_count));
}
public void
onDraw(Canvas canvas) {
canvas.drawBitmap(background_image, 0, 0,
null);
for
(int i = 0; i <
face_count;
i++) {
FaceDetector.Face face =
faces[i];
tmp_paint.setColor(Color.RED);
tmp_paint.setAlpha(100);
face.getMidPoint(tmp_point);
canvas.drawCircle(tmp_point.x,
tmp_point.y,
face.eyesDistance(),
tmp_paint);
}
}
}

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