Live fingerprint recognition completely eliminates "fingerprints"

"Fingerprint sets" swept the Internet. Many people think that fingerprint attendance machines have become furnishings. In fact, with the constant innovation and maturation of fingerprint technology, the use of such rubber fingers and artificial fingers is becoming more and more useless, and the appearance of living fingerprint identification technology makes fingerprint sets unrecognizable.

It is understood that in fingerprint products, fingerprint sensors and fingerprint algorithms are the key. Fingerprint processing is the process of collecting fingerprint images and image preprocessing. Therefore, whether a clear fingerprint image can be used is the key to fingerprint processing. A fingerprint sensor is a fingerprint image acquisition component. Therefore, the performance of the fingerprint sensor directly affects the performance of the fingerprint product.

Fingerprint sensors are classified into press type and slide type fingerprint sensors according to their physical form. The main types of fingerprint sensors are semiconductor fingerprint sensors and optical fingerprint sensors. With the change of fingerprint application requirements, fingerprint sensors have also undergone three generations of technological innovations.

The first generation of optical fingerprint sensors: mainly the principle of photogrammetry and reflection collection of fingerprint images, the advantages of strong antistatic ability, low product cost, long service life, but has the inability to carry out live fingerprint identification, poor applicability to wet and dry fingers Other shortcomings, such as "fingerprints" and other simulation fingers are easy to get through, that is, non-living fingerprint recognition.

The second-generation capacitive fingerprint sensor: It can also be called a semiconductor fingerprint sensor. It mainly uses the principle of capacitance, electric field, temperature, and pressure to achieve fingerprint image acquisition.

The third generation of improved capacitive fingerprint sensor: its advantages are higher acquisition resolution, can detect the dermis of the finger, and has good applicability to wet and dry fingers, also known as live fingerprint recognition. It is understood that the main line of the Asian Touch product line is the third-generation live fingerprint recognition technology.

The so-called live fingerprint recognition is an emerging technology that uses the electrical characteristics of the human dermis tissue to acquire the effective fingerprint eigenvalue data of the real human finger. Live fingerprint recognition can penetrate into the dermal layer of human skin tissue for fingerprint identification, and simultaneously sense the temperature, humidity and other indicators of the finger when intercepting the fingerprint image, further improving the effectiveness and safety of fingerprint recognition.

We know that fingerprint recognition is based on fingerprints, and true fingerprints are formed in the dermis. The fingerprint information of the dermis is clearer and more accurate than the epidermis, and does not change with age, but is acquired under the first generation of optical fingerprinting technology. Only the texture information of the fingerprint skin, such skin fingerprints will become blurred with age. In addition, the optical mechanism determines that the fingerprint can be easily copied. As long as the texture map of the fingerprint is obtained, a fingerprint can be copied. In contrast, the living identification technology determines that the recognition object must be a living finger, even if it is the same. The texture map or the fingers that are separated from the human body cannot be identified because they do not have the electrical characteristics of the leather fingerprint.

Fingerprint acquisition device using living fingerprint identification technology Therefore, the living fingerprint identification product can better protect the privacy of the user's fingerprints, can automatically adapt to the fingerprints of wet and dry, rough and scratched fingers, use more secure, and want to pass illegal means such as "fingerprint sets Fingerprinting of fingerprints, rubber fingers, fingerprints, fingerprints, and other fingerprints, and attempting to evade the identity authentication of the device can be rejected and completely lost.