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The first approach compares some of the distinctive traits of the person in the photo with the images already present in the database. These signs may be the distance between the eyes, the size of the nose, the shape of the lips and so on.
This method is similar to that of fingerprints. If you want to see some examples check the following website After all, we are studying the papillary lines of an unknown person to see if they fit the traits of one of the samples in the database. So the prerequisite of facial recognition is a picture with a certain quality (where the face is seen well and with a good light) of the appropriate person.
Where can you get photos with these features? The sources are various. Sometimes we may be asked to look at a webcam to create a discount card, or someone could scan some document with our photo

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