Biometric person authentication (2)
Voice capture is unobtrusive and voice print is an acceptable biometric in almost all societies. However, voice is affected by person's health, emotions, etc.
Several approaches in developing face recognition systems exist:
1) Based on user defined face-specific features, e.g., models of eyebrows, eyes, nose, etc., and the derivation of geometrical attributes, such as eyebrow thickness, nose width, a number of radii describing the chin shape, etc.
2) Based on templates and attempts to match well-defined portions of the face.
3) By employing linear projections of face images using either PCA or LDA.