The research of face recognition system began in the 1960s. With the development of computer technology and optical imaging technology improved after 1980s, the application phase of entering the primary stage was in the late 90s. And the research on the face recognition system of the United States, Germany and Japan Technology-based. Today, the application of face recognition technology has not only limited to business establishments, it has been a variety of smart home gradually penetrate into the form of ordinary people home. However, face recognition system information storage is still based on computer-readable language, that is, numbers or specific code, security will be discounted. Perhaps, many female friends miserable face recognition function, change hair, draw a makeup, it will not recognize. Fingerprint recognition technology is mature, but not for everyone Each fingerprint has several unique measurable feature points, each feature point has about seven features, people's ten fingers produce a minimum of 4900 independent measurable features. Fingerprint recognition technology by analyzing the fingerprint measurable feature points, eigenvalues ​​extracted from, and then certified. At present, China's second generation ID card will achieve the fingerprint collection, and all major smart phones have implemented the fingerprint unlock function. Compared with other biometric technology, fingerprint identification has been widely used in the fields of consumer electronics, security and other industries. Through the test of time and practice, the technical aspects are constantly being innovated. Although each person's fingerprint identification is unique, but not for every industry, everyone. For example, people whose hands are long-term hand-worked may have to worry about fingerprinting. Fingerprints may fail if their fingers are damaged or exposed to a wet or dry environment. Dry goods: a map to understand the five biometric technology Iris recognition biometrics technology "darling", safety in the first place Relative to other biometrics, iris recognition misclassification rate and rejection rate have reached the zero probability recognition level, and iris recognition belongs to the non-contact recognition, identification convenient and efficient. Iris is unique to everyone, with uniqueness that can not be copied, the highest level of security is currently the highest. However, the application price of iris recognition is also directly proportional to its technical difficulty, which is slightly more expensive compared to other recognition technologies. Voiceprint identification costs low, access to convenient, applicable strict requirements The so-called voiceprint, is the use of electro-acoustic instruments to carry voice information of the sound spectrum. It is ideally suited for remote identity verification and requires just one microphone or phone for remote login via the Internet (via a communications network or the Internet). However, the shortcomings of voiceprint identification is also very obvious, very demanding on the environment, in a noisy environment, mixed voice is not easy to obtain voice; people's voice will be with age, physical condition, age, emotions and the impact of Changes; different microphones and channels have an impact on the recognition performance and so on. Vein recognition speed, the product is difficult to miniaturize the market makes use of low Recently, the media reported Shennongjia finger vein vending machine vote, just 3 seconds to check, effectively easing congestion at the peak area of ​​the door. Vein identification is obtained through the finger vein identification instrument personal finger vein distribution, the eigenvalues ​​stored. When compared, real-time vein map, extract the eigenvalues ​​to match, so as to identify individuals. Today's vein recognition has four major characteristics: a high degree of security, easy to use, fast identification and high accuracy. The most important point is that the characteristics of finger vein recognition have been internationally recognized as unique and comparable with the retina. Under the condition that the rejection rate (the same structure chart, which is recognized by the algorithm as being different) is less than one ten thousandth , Its recognition rate (different structure, which is recognized by the algorithm as the same) may be less than one hundred thousandth. However, the current vein recognition function in the market is not high, but it also has a hard to avoid the shortcomings. For example, the dorsal veins may still change with age and physiology. The permanence has not been confirmed. There is still the possibility of unsuccessful registration. Due to the limitation of its own characteristics, the product is difficult to be miniaturized. Special requirements for the collection equipment , The design is relatively complex, high manufacturing costs. Generally speaking, with the development of the times and continuous improvement of technology, biometrics technology will usher in new changes and needs. The intersection of biometrics technology and the Internet and the Internet of Things will become the focus of various industries. The current single biometric technologies have their own advantages and disadvantages, and some problems will inevitably occur in the application. Perhaps the future of biometrics will diversify staggered development, learn from each other, and the market prospects of biometrics, still worth attention. It includes cylinder liner, piston and rings, valves and springs, full gaskets, main and conrod bearings and other Cylinder Block parts Cylinder Liner,Piston And Rings,Valves And Springs,Full Gaskets HGL AUTO PARTS CO.,LTD , https://www.hgl-engineparts.com