Fingerprint lock schematic structure at a glance fingerprint lock working principle technical illustration

What is the working principle of fingerprint lock? What is the principle of capacitive fingerprint unlocking? For maintenance personnel, it is necessary to understand the fingerprint lock principle and the principle of fingerprint recognition technology. Fingerprint lock is an important category of smart locks currently, and it is not uncommon in daily life. The working principle of fingerprint locks is needed for maintenance and inspection. Therefore, it is necessary to have a certain understanding of the structure diagram. SD6 Smart Lock China

The fingerprint identification system mainly includes the following steps: fingerprint image acquisition, fingerprint image preprocessing, feature extraction, and fingerprint feature matching. The fingerprint identification flow chart is as follows: SD6 Smart Lock China

SD6 Smart Lock China

The core components of the fingerprint lock include: Main board and clutch Fingerprint collector Attached to the unique cryptographic technology and microprocessor (CPU) and the final smart emergency key several core components. As far as fingerprint locks are concerned, the French chip should be the most important part, and it is equivalent to the human heart. In other words, the "heart" must be healthy, otherwise the mechanical part will become more advanced, and the chip recognition will not be high. If a person's fingerprint can be opened, it would be unsafe. What's more, no matter what the lock is, it is still a mechanical product. SD6 Smart Lock China

SD6 Smart Lock China

In the fingerprint identification system, the pretreatment of the fingerprint image is the basis for proper feature extraction, matching and other operations. The purpose of preprocessing is to use signal processing techniques to remove various noise disturbances in the image, turn it into a clear fingerprint image, restore the fingerprint ridgeline structure, in order to reliably extract the correct fingerprint characteristics; SD6 smart lock China

SD6 Smart Lock China

Fingerprint preprocessing generally includes several processes: SD6 smart lock China

First, the fingerprint image is normalized; SD6 smart lock China

Second, the direction of fingerprint extraction; SD6 smart lock China

Third, the grayscale image filtering is performed based on the directional pattern and then binarized and refined. SD6 Smart Lock China

The coordinates of the detail feature directly represent the fingerprint, so the quality of the feature extraction directly affects the subsequent fingerprint matching. Therefore, feature extraction is one of the key parts of the fingerprint recognition system. SD6 Smart Lock China

The general method of fingerprint recognition is to extract feature points in two images using certain methods to match the feature points. This is the point pattern matching problem. SD6 Smart Lock China

In the entire fingerprint recognition system, preprocessing and feature extraction are two key steps, which are directly related to the outcome. SD6 Smart Lock China

Human skin consists of three parts: the epidermis, the dermis, and the subcutaneous tissue. Fingerprints are raised lines on the epidermis. Due to the genetic characteristics of humans, although fingerprints are available to everyone, they are different. No two fingerprints have been found in the entire world to be identical, but its shape characteristics are fixed. SD6 Smart Lock China

According to the uniqueness of each person's fingerprint, it is determined that the fingerprint is used as a key. Through pre-archiving in the system, individuals' fingerprints are stored in advance. When the user needs to access, the fingerprint sensor collects the fingerprint information of the user, passes the fingerprint feature value to the fingerprint identification chip for analysis and comparison, and determines whether the user has the right to access. If the user has the required authority, after the verification passes, the fingerprint identification chip outputs the control signal to drive the gated DC motor to realize the control of the door; if the user does not have the corresponding authority, the verification will give the verification failure information. SD6 Smart Lock China

Fingerprint lock is a kind of intelligent lock with human fingerprint as the carrier and means of identification. It is the perfect crystallization of computer information technology, electronic technology, mechanical technology and modern hardware technology. Fingerprint locks generally consist of two parts: electronic identification and control, and mechanical linkage system. The uniqueness and non-replicability of the fingerprint determines that the fingerprint lock is the safest kind of lock among all current locks. SD6 Smart Lock China

With the development of science and technology, fingerprint locks will become increasingly sophisticated, but the main modules and working principles will remain unchanged. SD6 Smart Lock China