Which part of the smart lock fingerprint identification system

There are many types of smart locks, among which fingerprint locks are most widely used. The fingerprint of a person is unique and has no change in life. Fingerprint unlocking is convenient and safe. So what part of this fingerprinting system is made up? Let's look at it together with Xiaobian.

A. Fingerprint image compression

Large-capacity fingerprint databases must be compressed and stored to reduce storage space. The main methods include JPEG, WSQ, EZW and so on.

II. Fingerprint image processing

Including fingerprint area detection, image quality judgment, pattern and frequency estimation, image enhancement, fingerprint image binarization and refinement. Pre-processing refers to the processing of fingerprint images containing noise and pseudo-features using a certain algorithm to make the structure of the ridge lines clear and the feature information prominent. Its purpose is to improve the quality of fingerprint images and improve the accuracy of feature extraction. In general, the preprocessing process includes normalization, image segmentation, enhancement, binarization, and refinement, but depending on the specific situation, the preprocessing steps are also not the same.

III. Fingerprint feature extraction

Fingerprint feature extraction: Extracts fingerprint feature point information (endpoints, bifurcation points, etc.) from preprocessed images. The information mainly includes parameters such as type, coordinates, and direction. The detailed features in fingerprints usually include endpoints, bifurcation points, isolated points, short bifurcations, rings, and so on. The ridge end point and the bifurcation point have the most chance, the most stable, and easy to obtain in the fingerprint. These two types of feature points can match the fingerprint features: the degree of similarity between the feature extraction results and the stored feature templates is calculated.

Four. Fingerprint matching

Fingerprint matching is to compare the characteristics of fingerprints collected in the field with those stored in the fingerprint database to determine whether they belong to the same fingerprint. There are two ways to compare fingerprints:

1. One-to-one comparison: According to the user ID, the fingerprint of the user to be compared is retrieved from the fingerprint database, and then compared with the newly acquired fingerprint;

2. One-to-many comparison: The newly acquired fingerprint and all the fingerprints in the fingerprint database are compared one by one.

With the development of science and technology in China, the application of fingerprint recognition is very extensive, especially in the access control and attendance. And the price is low, more and more users accept this technology. To learn more about fingerprint locks, you can follow us on our website, or leave us a message at the bottom of the article.

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