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Please note the difference between Face Detection and Face Recognition. Face Detection is the task of finding a face in a given image. Face Recognition is the task of identifying a person from a given face image.

If Face Detection is what you are after, then you can find all the neccessary informations in the OpenCV Tutorial at:

• http://docs.opencv.org/trunk/doc/tutorials/objdetect/cascade_classifier/cascade_classifier.html#cascade-classifier

If Face Recognition is what you are after, then the csv.ext refers to the image database you want to learn the classifier on. All relevant information can be found in the documentation on the FaceRecognizer class:

• http://docs.opencv.org/trunk/modules/contrib/doc/facerec/facerec_tutorial.html#face-database