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A Technology of Interest: Facial Recognition
Facial recognition algorithms might recognize features by analyzing things about them. For instance, it may check the shape of one's eyes, their distance from each other, their distance from the forehead and from the bridge of the nose, and other such characteristics.

According to Wikipedia, there are two main approaches to facial recognition algorithms. These focus on either looking over distinguishing features, or which converts an imagine into values that can be compared to those on a template to eliminate variances, respectively called geometric and photometric.

In addition, 3-D points can be used to offer a more effective result, and which also provide a better variety of angles from which to view the face.

https://en.wikipedia.org/wiki/Facial_recognition_system