EMGU CV Face Recognition from Image

Question

I've been working with OpenCV before for C++ work and It was working great. Now, I'm developing a C# project and using EMGU CV for gender recognition. I've got problem with predict function. Every time I ran it, program crashed on Predict function, when I erased predict line, it is running. Here's my code:

private void Window_Loaded(object sender, RoutedEventArgs e)
{
     FaceRecognizer face = new FisherFaceRecognizer(0, 3500);
     face.Load("colorFisherFaceModel.yml");                
     Image<Bgr, Byte> img1 = new Image<Bgr, Byte>("C:\\Users\\sguthesis\\Pictures\\me.jpg");
     cascade = new CascadeClassifier("C:\\Users\\sguthesis\\documents\\visual studio 2013\\Projects\\EmguCV FFR with Image\\EmguCV FFR with Image\\haarcascade_frontalface_alt_tree.xml");
     FaceRecognizer.PredictionResult predictedLabel = face.Predict(img1);
}

Also, I want to get an output, 1 or 2. 1 for male and 2 for female. I have trained many data that saved on colorFisherFaceModel.yml. It was run well on OpenCV. But I don't know how to use it in EMGU CV.

Answer 1

I'm also working on EmguCV, so I guess I can point few things here, So first thing is you load "yml" file, Is this file you saved after recognizer is trained or you obtained from somewhere. Because my understanding is first you have to train your Recognizer, what is the structure of the yml file. Why do you load the cascade, where are you going to use it? (normally this is used to detect the face)

If you're saying that program crashed most probably because there are no items in the trained set. (in this case i guess it would be yml file) or as what I've read you need minimum of two faces in training set in order to use Fisher recognizer.

Answer 2

this happens because the FaceRecognizer wants to be trained before the Predict method can be called.

You can even load an existing xml Training file by the face.Load(yourTrainingFile.xml) method or by face.Train(yourImages.ToArray, imageIds.ToArray()) method.

Place your FaceRecognizer.PredictionResult predictedLabel = face.Predict(img1); code part within a trycatch block the the debugger wont close and you will catch the error message.

PS : if the number of pictures have been changed since the last Training.xml file has been created, then it's recommended to call the face.Train method instead of face.Load method!