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Now am trying to train SVM with SURF features.But now I have some doubt about training sets. I want to train around 100 people. So for that I take 40 images per each person and for each set of images I labeled as 1,2,3,4 etc.. So at the time of prediction, when the system is detected a person but that person is not in the training sets I want to show that the person is an unknown person. So my question is, how should I prepare my training sets in order to show results like this.plaese help me...

Now am trying to train SVM with SURF features.But now I have some doubt about training sets. I want to train around 100 people. So for that I take 40 images per each person and for each set of images I labeled as 1,2,3,4 etc.. So at the time of prediction, when the system is detected a person but that person is not in the training sets I want to show that the person is an unknown person. So my question is, how should I prepare my training sets in order to show results like this.plaese help me...