Face recognition is a K class problem. The face recognition problem is formulated as a problem in difference space. In difference space we formulate face recognition as a two class problem. The classes are: dissimilarities between faces of the same person. By modifying the interpretation of the decision surface generated by SVM.

Face recognition is different from classical pattern-recognition problems such as character recognition.

Face recognition is different from classical pattern-recognition problems such as character recognition.

On the other hand, in 804 P.J Phillips face recognition, there are many individuals (classes), and only a few images (samples) per person, and algorithms must recognize faces by extrapolating from the training samples. In numerous applications there can be only one training sample (image) of each person. Support vector machines (SVMs) are formulated to solve a classical two class pattern recognition problem. We adapt SVM to face recognition by modifying the interpretation of the output of a SVM classifier and devising a representation of facial images that is concordant with a two class problem. Traditional SVM returns a binary value, the class of the object.