Read fingerprint images, extract features, save data and compare. At first, the fingerprint image of human body is read by fingerprint reading equipment. 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 fingerprint-feature data, which is a one-way conversion, which can be converted from fingerprint to feature data but not from feature data to fingerprint. 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 records with the size of1k. In any case, 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 produced by the uneven skin 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 and enables 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 fingerprints, and by comparing his fingerprints with pre-stored fingerprints, we can verify his true identity. This technology that relies on the physical characteristics of the human body for identity verification is called biometric technology, and fingerprint recognition is one of the biometric technologies. At present, from a practical point of view, fingerprint identification technology is superior to other biometric technologies. This is because fingerprints are different and basically remain unchanged for life. The research and practice of automatic fingerprint identification system for police in recent twenty or thirty years has laid a good technical foundation for automatic fingerprint identification for security personnel. Especially, the existing automatic fingerprint identification system has reached the stage of convenient operation, accuracy, reliability and moderate price, and it is a practical biometric identification method.

In the computer system, fingerprint identification can be used to confirm the identity of boot login, the access rights and identity of remote network database, the encryption method to prevent fraudulent use of bank deposits and universal deposits, 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 the fingerprint information is recorded on a special 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 anti-counterfeiting and so on.

Computer fingerprint automatic 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, you can withdraw money and log in to the computer with your fingerprints. I believe this day will not be too far away.