您必须创建自己的面部跟踪器版本,它将扩展 google.vision 面部检测器。在您的 mainActivity 或 FaceTrackerActivity(在谷歌跟踪示例中)类中创建您的 FaceDetector 类版本,如下所示:
class MyFaceDetector extends Detector<Face> {
private Detector<Face> mDelegate;
MyFaceDetector(Detector<Face> delegate) {
mDelegate = delegate;
}
public SparseArray<Face> detect(Frame frame) {
YuvImage yuvImage = new YuvImage(frame.getGrayscaleImageData().array(), ImageFormat.NV21, frame.getMetadata().getWidth(), frame.getMetadata().getHeight(), null);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
yuvImage.compressToJpeg(new Rect(0, 0, frame.getMetadata().getWidth(), frame.getMetadata().getHeight()), 100, byteArrayOutputStream);
byte[] jpegArray = byteArrayOutputStream.toByteArray();
Bitmap TempBitmap = BitmapFactory.decodeByteArray(jpegArray, 0, jpegArray.length);
//TempBitmap is a Bitmap version of a frame which is currently captured by your CameraSource in real-time
//So you can process this TempBitmap in your own purposes adding extra code here
return mDelegate.detect(frame);
}
public boolean isOperational() {
return mDelegate.isOperational();
}
public boolean setFocus(int id) {
return mDelegate.setFocus(id);
}
}
然后,您必须通过修改 CreateCameraSource 方法将您自己的 FaceDetector 与 CameraSource 结合起来,如下所示:
private void createCameraSource() {
Context context = getApplicationContext();
// You can use your own settings for your detector
FaceDetector detector = new FaceDetector.Builder(context)
.setClassificationType(FaceDetector.ALL_CLASSIFICATIONS)
.setProminentFaceOnly(true)
.build();
// This is how you merge myFaceDetector and google.vision detector
MyFaceDetector myFaceDetector = new MyFaceDetector(detector);
// You can use your own processor
myFaceDetector.setProcessor(
new MultiProcessor.Builder<>(new GraphicFaceTrackerFactory())
.build());
if (!myFaceDetector.isOperational()) {
Log.w(TAG, "Face detector dependencies are not yet available.");
}
// You can use your own settings for CameraSource
mCameraSource = new CameraSource.Builder(context, myFaceDetector)
.setRequestedPreviewSize(640, 480)
.setFacing(CameraSource.CAMERA_FACING_FRONT)
.setRequestedFps(30.0f)
.build();
}