Real-time facial recognition on Android

Good morning!

I'm creating a real-time facial recognition application. The application should compare the video image with a recorded image.

In practically all the searches that I did the most suitable to be used was OpenCV .

Implemented with this tutorial , the library containing version 3.1.0 of OpenCV.

I'm reading all of the API information. However, I'm not finding a method for face recognition, where I can use onDraw and draw a square on the face, much less how to use facial recognition and compare with another face.

Has anyone used this API yet? Do you recommend using this or another tool?

Below the source:

ShowCameraActivity

public class ShowCameraActivity  extends AppCompatActivity implements CvCameraViewListener2 {

private static final String TAG = "OCVSample::Activity";
private CameraBridgeViewBase mOpenCvCameraView;
private boolean              mIsJavaCamera = true;
private MenuItem             mItemSwitchCamera = null;
Mat mRgba;
Mat mRgbaF;
Mat mRgbaT;

public ShowCameraActivity() {
    Log.i(TAG, "Instantiated new " + this.getClass());
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    Log.i(TAG, "called onCreate");
    super.onCreate(savedInstanceState);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setContentView(R.layout.show_camera);
    mOpenCvCameraView = (JavaCameraView) findViewById(R.id.show_camera_activity_java_surface_view);
    mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
    mOpenCvCameraView.setCvCameraViewListener(this);
}

@Override
public void onCameraViewStarted(int width, int height) {

    mRgba = new Mat(height, width, CvType.CV_8UC4);
    mRgbaF = new Mat(height, width, CvType.CV_8UC4);
    mRgbaT = new Mat(width, width, CvType.CV_8UC4);
}

@Override
public void onCameraViewStopped() {
    mRgba.release();
}

@Override
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
    mRgba = inputFrame.rgba();
    Core.transpose(mRgba, mRgbaT);
    Imgproc.resize(mRgbaT, mRgbaF, mRgbaF.size(), 0,0, 0);
    return mRgba;
}

private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                Log.i(TAG, "OpenCV loaded successfully");
                mOpenCvCameraView.enableView();
            } break;
            default:
            {
                super.onManagerConnected(status);
            } break;
        }
    }
};

@Override
public void onPause()
{
    super.onPause();
    if (mOpenCvCameraView != null)
        mOpenCvCameraView.disableView();
}

@Override
public void onResume()
{
    super.onResume();
    if (!OpenCVLoader.initDebug()) {
        Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_1_0, this, mLoaderCallback);
    } else {
        Log.d(TAG, "OpenCV library found inside package. Using it!");
        mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
    }
}

show_camera.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
xmlns:opencv="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent">

<org.opencv.android.JavaCameraView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:visibility="gone"
    android:id="@+id/show_camera_activity_java_surface_view"
    opencv:show_fps="false"
    opencv:camera_id="back" />

Inserted in Manifest.xml

<uses-permission android:name="android.permission.CAMERA"/>
<supports-screens android:resizeable="true"
    android:smallScreens="true"
    android:normalScreens="true"
    android:largeScreens="true"
    android:anyDensity="true" />

<uses-feature android:name="android.hardware.camera" android:required="false"/>
<uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/>
<uses-feature android:name="android.hardware.camera.front" android:required="false"/>
<uses-feature android:name="android.hardware.camera.front.autofocus" android:required="false"/>

PS: The question Facial Recognition of 2014 indicated the use of < a href="http://docs.opencv.org/trunk/modules/contrib/doc/facerec/facerec_tutorial.html"> tutorial where the link is down. Also read about the FaceDetection very good, by the way. But most of the methods are discontinued and even implementing the methods update, I am not able to validate the image with some photo.

Thank you!