How to implement Face Recognition on Xamarin.Android

[Takanashi-T]

An error will occur if the following processing.
How should I implement it?

C#
Stream input = Resources.OpenRawResource(Resource.Raw.haarcascade_frontalface_default))
Java.IO.File dir = GetDir("cascade", FileCreationMode.Private);
Java.IO.File file = new Java.IO.File(dir, "haarcascade_frontalface_default.xml");

var output = new FileOutputStream(file);
byte[] buf = new byte[2048];
Output(output, buf);

input.Dispose();
output.Dispose();
string resource = file.AbsolutePath;

var cascade = new CascadeClassifier(resource);

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[matstumpf]

I added libOpenCvSharpExtern.so in /lib/armeabi-v7a and set the "Build Action = AndroidNativeLibrary".
Also added "haarcascade_frontalface_default.xml" to Assets and set "Build Action = AndroidAsset"

Then in MainActivity:

 Mat ImageOne = Mat.FromImageData(GetBytesFromBitmap(img1), ImreadModes.GrayScale);
 Mat ImageTwo = Mat.FromImageData(GetBytesFromBitmap(img2), ImreadModes.GrayScale);

string path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
 string filename = System.IO.Path.Combine(path, "haarcascade_frontalface_default.xml");

File.WriteAllText(filename, GetTextFromAsset("haarcascade_frontalface_default.xml"));

using (var imageOne = ImageOne)
using (var imageTwo = ImageTwo)
using (var model = FaceRecognizer.CreateEigenFaceRecognizer())

Here in last line

FaceRecognizer.CreateEigenFaceRecognizer()

It throw a exception because cant find the cv::face, that's because my extern.so was compiled without the face class implementation.

I'm trying now to have the complete .so (building from source), but always throw the exception:

1> undefined reference to 'cv::face::createEigenFaceRecognizer(int, double)'

Any clue?