The diversity of biometrics determines the accuracy of this biometric identification. Fingerprints, faces, and irises are all well-known recognition methods. However, a "Mission Impossible 5" released this year has made us realize A newer biometric technology - gait analysis. What exactly is gait analysis? Where is the magic?
What is gait? As the name implies, it refers to the posture of human walking, describing the periodic phenomenon of the walking characteristics of people; while the gait analysis is to record, observe, analyze the body movement mode, establish a gait model, extract stable parameter characteristics, and go through the computer. The process of identification. A complete gait cycle includes two phases, the “support phase†and the “swing phaseâ€.
Early medical research has shown that the human gait has 24 different components, including bone length, muscle strength, joint flexibility, etc., combining these gait characteristics, "gait" has individual characteristics. When used for identification, simply input the captured image into the system, the computer will match through the gait recognition algorithm, find the matching object from the database, and display the final result.
In fact, as explained in the "Mission Impossible" film, gait is difficult to cover and disguise, and can be accurately identified in both long-distance and low-resolution situations. Below, we will talk about the "gait analysis system" that makes Bangui completely desperate for the three principles of diversity, stability and collectability of biometrics.
For gait analysis, there is an assumption that each person has a unique face and each person has a different gait from others. Of course, the above assumptions are recognized by medical research, which means that "everyone's gait is unique." From an anatomical point of view, the physical basis of gait uniqueness is the difference in physiological structure of each person. Different leg bone length, muscle strength, center of gravity height and motor nerve sensitivity jointly determine the uniqueness of gait.
Like other biometric technologies such as iris, fingerprint, and sound, gait analysis also has stability problems, that is, a person's gait can be affected by factors such as injury, weight gain or loss, and even dress comfort. And change. Therefore, there are certain challenges in its stability.
For a very simple example, for example, if the shoes worn on the feet are not fit or comfortable enough, the walking posture of the wearer will change; or when the walking or exercising, the ankle will be accidentally sprained, then As you limped, the gait analysis system will think that you are another person or cause verification failure. In fact, each type of biometric identification may not be verified due to some accidents. Therefore, it is necessary to establish a comprehensive and comprehensive verification system, which is called the alternative.
As we all know, each biometric technology will not be able to collect feature information completely and accurately due to some "accidents". Gait analysis also has similar problems in collecting data. For example, the difference between trousers flat shoes and long skirt high heels, or some religious countries, robes are their traditional clothing, the legs are completely obscured, consistent with gait analysis and so on.
Seeing this, someone might say that it needs eggs? In fact, the advantage of gait analysis lies in long-distance recognition, up to hundreds of meters. In addition, gait analysis can easily distinguish different patterns of people, such as walking, running, weight-bearing and so on. In the future, a variety of biometric technologies will be combined and automatically switched according to actual application scenarios, user conditions, and security levels to form a multi-modal recognition technology that will be more competitive than any single biometric.
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