Pattern unlocking, password unlocking, face unlocking, after the emergence of many personal security unlocking methods, fingerprint unlocking with higher security factor also appeared. Do you know how he works?
"Fingerprint, because of its lifelong invariance, uniqueness and convenience, has almost become a synonym for biometric recognition. Fingerprint refers to the ridges on the front skin of the end of the finger. The ridges are regularly arranged to form different patterns. The starting point, end point, junction point and bifurcation point of the ridges are called the detailed feature points of fingerprints."
Note: The above paragraph is taken from Baidu Encyclopedia.
From the above content, we know that the points formed by the interruption, bifurcation or turning point in the fingerprint are the detail feature points, and these detail feature points can be said to provide the confirmation information of fingerprint uniqueness. The typical ones are endpoints, bifurcation points, bifurcation points, isolated points, loop points, short lines, etc. By recording the direction of your fingerprint lines and the position of feature points (the position is determined by the X/Y axis), you can establish a unique fingerprint lock in the world, and the key is your fingerprint.
Because the orientation of fingerprint scanning is not exactly the same every time, and different points of focus will also bring different degrees of deformation, which will lead to a large number of fuzzy fingerprints. Therefore, the key of fingerprint recognition technology is to correctly extract features and achieve correct matching. Fingerprint recognition involves image processing, pattern recognition, computer vision and many other disciplines.
To identify fingerprints, first of all, establish a fingerprint database to make your original fingerprint data the initial identification code.
The fingerprint acquisition process is shown in the figure below. At present, there are mainly three types of fingerprint acquisition: live optical, capacitive and pressure-sensitive.
Capacitive fingerprint acquisition view, through the contact between the skin and the screen, identify the fingerprint lines to record and verify fingerprints.
Optically, fingerprint is recorded and verified through light reflection imaging.
The pressure-sensitive type is to sense the concave and convex fingerprint and image by sensing the semiconductor pressure-sensitive material.
After the fingerprint is captured, it will refine the fingerprint, highlight its fingerprint feature points, and facilitate comparison and verification.
Fingerprint verification is a new type of verification method with better security coefficient on mobile phones, because only you own the fingerprint corresponding to unlocking, and mobile phone security and personal privacy can be effectively protected. So now many mobile phone manufacturers are scrambling to add fingerprint identification function to their mobile phones. Dear, is your mobile phone safe enough?
