computer vision - Facial features extraction in MATLAB -

i have project in need make neural network face recognition. inputs of network should features of face needs recognized.

i searched lot , found surf detector of matlab's computer vision toolbox 1 me extract features of face. surf detector extracts keypoints of face , each of them sets vector 64 or 128 values. problem number of keypoints varies,and need same each face, able feed inputs of neural network.

so thought extract features can presented single number, proportions of nose,mouth,eyes face, or distance between eyes, etc.
how can these features, , enough serve inputs neural network need recognize faces? on output of neural network there same number of neurons there different people in database, , in training phase i'm going feed network extracted face features photo, , if photo of let's third of 5 people in database, output layer [0,0,1,0,0].

is approach , can give me code extracts face features face in matlab?

proportions of nose/mouth/eyes face , distance between eyes give bad results. not measures accurate or distinctive enough.

if you're looking features face recognition, should consider lbp: http://www.scholarpedia.org/article/local_binary_patterns#face_description_using_lbp