What did the authorities say about fingerprints?

According to the handprint, the official said fingerprint recognition.

Fingerprint is almost synonymous with biometrics because of its lifelong invariance, uniqueness and convenience. Fingerprint refers to the uneven lines on the skin at the front end of human fingers. Because everyone's fingerprints are different, even between the ten fingers of the same person, there are obvious differences, so fingerprints can be used for identity recognition. In fact, in ancient China, fingerprints (handprints) were used for signature very early.

Extended data:

The overall characteristics of fingerprints:

General features refer to features that can be directly observed by human eyes. Include particle shape, pattern area, core points, triangular point and particle number.

On the basis of long-term practice, fingerprint experts generally classify fingerprints into three categories according to the direction and distribution of lines-ring (also called bucket), arch and spiral.

Pattern area is the area where fingerprints include general features, from which we can distinguish which type fingerprints belong to. Some fingerprint identification algorithms only use the data in the pattern area, while others use the complete fingerprint.

The core point is located in the progressive center of the fingerprint line and serves as a reference point when reading and comparing fingerprints. Many algorithms are based on core points, that is, only fingerprints with core points can be processed and recognized.

Triangular points are located at the first bifurcation point or breakpoint from the core point, or at the convergence point, isolated point and turning point of two straight lines, or point to these singular points. Triangular points provide the beginning of fingerprint line counting and tracking.

The number of lines, that is, the number of fingerprint lines in the pattern area. When calculating the fingerprint line, the core point and triangle point are generally connected first, and the number of times this line intersects the fingerprint line can be considered as the number of fingerprint lines.

Baidu encyclopedia-fingerprint identification