1. A computer implemented method for identifying a person based on their physical trait, the method comprising: capturing a sequence of simultaneous images of both a front view and profile view of a tongue of a person using an image capture device to obtain a plurality of static and dynamic features of the tongue; collecting measurement vectors from the extracted dynamic features; determining a mean value μ and covariance matrix Σ of the measurement vectors; comparing the static and dynamic features of the captured images of the tongue to recorded details of a plurality of tongues in a database via a data processing device; wherein if a match is found in the database by the data processing device, the person is identified.