Lip unlocking, as the name implies, is to use the action characteristics of human lips to unlock, which belongs to the biometric unlocking method as well as fingerprint and face recognition. The general way of lip movement recognition is that a person reads a string of words or numbers into the device, with or without sound. The camera will capture the lip movement characteristics of the person (called "the first lip movement characteristics") and compare them with the pre-stored lip movement characteristics (called "the second lip movement characteristics"). If the matching degree reaches a certain level, the unlocking is successful.
In fact, biometrics can be realized by using the uniqueness of biological characteristics, that is, everyone's biological characteristics are unique. And this uniqueness determines the unchangeable nature of biological characteristics. For example, if the digital password of a mobile phone is leaked, the user can change the password to ensure security; If the face information is leaked, it is impossible to modify the face information. This means that once the biometric characteristics are leaked, the risk may be permanent.
It is also biometric identification, but lip unlocking is "modifiable". As can be seen from the instructions, this is actually a combination of biology and password. Because the unlocking process requires people to read a string of characters or numbers, in fact, unlocking includes two parts, one is the characteristics of people's lips, and the other is the content they read. The former is biometric and the latter is password, so the unlocking method is modifiable.
specifically, in the unlocking mode combining biology and password, the unlocking principle can be divided into two types-lip feature priority and password feature priority. For example, the preset stored lip feature is "people read four numbers of 1111 with or without voice". In the lip feature priority mode, the system will compare the current and previously stored lip features. If the matching degree is greater than 8%, the unlocking is successful, and if the matching degree is less than 8%. If the matching degree is between 5% and 8%, verify whether the password is correct, that is, whether the four numbers of "1111" are read. If it is correct, it will be unlocked successfully; if it is wrong, it will be unlocked failed.
Although Huawei's patent for lip unlocking disclosed this time does solve the inherent "unmodifiable" problem of biometric identification, its convenience is obviously not as good as that of face recognition. After all, in order to unlock, users need to hold up their mobile phones and say a string of words to the camera, which may be awkward whether they read aloud or lip-synch.
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