Read the fingerprint image, extract features, save data and compare. At the beginning, the fingerprint image of human body is read by fingerprint reading equipment, and after the fingerprint image is obtained, the original image should be preliminarily processed to make it clearer. Next, the fingerprint identification software establishes the digital identification of fingerprints-feature data, which is a one-way conversion, which can be converted from fingerprints to feature data but not from feature data to fingerprints, and two different fingerprints will not produce the same feature data. Some algorithms combine node and direction information to generate more data, which shows the relationship between nodes, while others also process the whole fingerprint image. In a word, these data, usually called templates, are saved as 1K-sized records. No matter how they are composed, there is still no template standard and no published abstract algorithm, but each manufacturer does it himself. Finally, through the method of computer fuzzy comparison, compare the templates of two fingerprints, calculate their similarity, and finally get the matching result of two fingerprints.
The lines generated by the skin scraggy on the inner surfaces of our palms, fingers, feet and toes will form various patterns. The existence of these lines increases the friction on the skin surface, enabling us to grasp heavy objects with our hands. People have also noticed that the lines of these skins, including fingerprints, are different in patterns, breakpoints and intersections, that is, they are unique. Relying on this uniqueness, we can associate a person with his fingerprint, and by comparing his fingerprint with the pre-stored fingerprint, we can verify his true identity. This technology that relies on the physical characteristics of human body for identity verification is called biometric technology, and fingerprint recognition is one of biometric technologies. At present, from a practical point of view, fingerprint identification technology is superior to other biometric identification technologies. This is because fingerprints are different and basically unchanged for life. The research and practice of automatic fingerprint identification system for police in recent twenty or thirty years have laid a good technical foundation for automatic fingerprint identification for security guards. In particular, the existing automatic fingerprint identification system has reached the stage of convenient operation, accuracy, reliability and moderate price, which is a practical biometric method.
in computer systems, fingerprint identification can be used to confirm the identity of boot-up login, the access authority and identity of remote network database, the encryption method of preventing fraudulent use of bank deposits and universal deposit and withdrawal, the identity of the insured in the insurance industry, the identity of the drawer of futures securities, the identity of the medical insurer in the medical and health system, etc. If fingerprint information is recorded on a special-purpose card, fraud such as impersonation can be prevented through on-site comparison. For example: credit card, medical card, conference card, savings card, driver's license, admission ticket, passport security, etc.
Automatic computer fingerprint identification technology is coming into our real life from science fiction and Hollywood movies. Maybe one day, you don't have to carry that bunch of keys with you, just press your finger and the door will open. You don't have to remember that annoying password, so you can withdraw money and log in to the computer with your fingerprint. I believe this day will not be too far away.