How to organize the collection of fingerprints?

Question

Programming

How to organize the collection of fingerprints?
I am designing a program for access to the enterprise by fingerprint. How many images to make per employee? Are there any articles on what principle a fingerprint is added to smartphones?
How to store fingerprints in the database, in what form?

Answer 1

Well, look, you have a sensor, for example, a " photo " of a print. Next, this photo is processed by a machine vision system that extracts the structural features of your print. Read about how fingerprinting works in forensics. Let's call this set of features "pattern". In general, bring the piece of iron to a state where it will return the "pattern" to you. You collect a database of patterns, rank sets of features according to the maximum specificity. Get a reverse search tree. Cut off everything unnecessary. Build an index on it.
On phones, the same principle, only the pattern is stored directly in the piece of iron and the device interacts according to the principle - what is the pattern identifier and the recognition event. Well, adding with deletion. The principle is the same, only implemented completely in hardware with a public interface via SPI / I²C.

Answer 2

See the guide. As a rule, there is either issued passed, failed, or a blob