How are sites created that determine the similarity of faces in the database?

Question

Photo

There are many sites on the Internet that offer the user to upload a photo and find similar faces from the prepared database. Always wondered how such sites are created in general? In which direction to dig? I would be very grateful for any help.

Answer 1

Dig towards questions: what is a photograph, how different types of photos store information, how to recognize a nose, eyes and other features in a photo separately.

Answer 2

there are neural networks there, you won’t find a script like that, they train on the elements of a face and then there is a similarity
of programs looking for similar graphic files (not 1 in 1), but the same opencv allows something,
but neural networks are not so difficult, go deeper and you will almost certainly find the target libraries

Answer 3

Face Detection API использовать.
Например,
blog.mashape.com/list-of-10-face-detection-recogni...

Answer 4

Есть море готовых решений, разной степени качества, но есть и общая проблема снижения точности с уменьшением размера, по этому в социальных сетях, пространство поиска уменьшают до известных социальных связей.