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From what I understood, the Active Shape Model (ASM) is used in facial recognition. I figured out how the ASM works but I don't get why we use it.

How this shape is suppose to be interpreted for facial recognition? Should it be compared directly to the database?

I have read many research papers about ASM and facial recognition but none of them explains the point of it.

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The active shape model algorithm is used to locate precisely the eyes, eyebrows, nose and mouth of a person. It is also used to align faces that are tilted. It is not used directly for face matching and it has nothing to do with databases. It is a preprocessing step. You (I) will need another algorithm to match its result with a database. (ICA for example)

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