1. Medical evidence
Finger vein is a new biometric recognition technology, which originated from the advanced development project of the management of human brain functional activities in the field of medical technology. In this development, near infrared rays are used to observe the increase in blood flow. When passing through human tissues, hemoglobin in venous blood vessels has obvious absorption of near infrared rays, so that the distribution characteristics of venous blood vessels are characterized by different gray values ​​in the image. Due to the randomness of the elongation direction, the individual finger vein blood vessel distribution has different structures, so it can be determined whether the two vein images come from the same finger. At the same time, it was found that this technology is also suitable for the collection of finger vein images.
2. Technical architecture
Finger vein recognition uses light propagation technology to compare and identify finger veins. When near infrared rays pass through a human finger, part of the radiation will be absorbed by the hemoglobin in the blood vessel, thereby capturing the unique finger vein pattern, and then comparing with the pre-registered finger vein pattern to identify the individual. It has been proven by medical practice that the shape of the finger veins is unique and stable, that is, each person's finger vein image is different, and the same person's finger vein image is also different. The vein shape of healthy adults no longer changes, which provides a medical basis for finger veins. Therefore, the recognition technology based on the principle of finger vein image may become a reality. Therefore, the vein distribution image in the finger can be used for identification.
3. Finger vein system recognition process
In vein scanning, the LED emits near infrared rays on one side of the finger, transmits it through the finger, and on the other side, the camera takes a picture of the vein. From the extraction to the finger vein image, this process mainly captures the finger vein image, then extracts the finger vein feature information, and compares it with the finger vein feature registered in advance to confirm the identity of the registrant. In order to compare the scanned pattern with the original registered pattern, the relevant identification result can be obtained (that is, the related identification result can be obtained by comparing the scanned pattern with the original registered pattern).
The finger vein recognition algorithm uses the texture tracking method to extract the line structure information in the finger veins, and performs individual recognition through the matching of the line structure. It can run on the PC environment and embedded DSP platform.
Outstanding features of finger vein recognition technology
Compared with other biometric technologies, this finger vein recognition technology has the following major advantages.
· Since the finger veins are hidden inside the body, there is no risk of imitation or theft, and the skin conditions on the surface of the human hand will not affect the identification work;
· The use of infrared light by non-invasive and non-contact imaging technology can ensure user convenience and cleanliness. Compared with some biometric technologies, the finger vein recognition technology is non-contact and will be more hygienic in public;
· Due to the relative stability of the shape of the finger veins and the clarity of the captured image, small and simple data imaging techniques can be applied to the pattern data captured by the low-resolution camera;
· High security. Because the veins are hidden inside the fingers, it is extremely difficult to copy and steal. Compared with other technologies that use the in vitro characteristics of the human body for authentication, this method is more secure. At the same time, vein authentication can sense the blood flow and blood pressure in the finger, and it can also perform a living body test during the recognition process.
· High accuracy. The sampling sample is inside the human body, so the interference from the outside world is very small during the matching process. Gently release your finger to trigger highly accurate recognition. According to strict medical certification and mathematical statistics, FRR (rejection rate) is 0.01%, FAR (recognition rate) is 0.0001%, and FTE (registration failure rate) is 0%.
It can be seen that, compared with other biometric technologies, finger vein recognition technology is much more difficult to copy and steal than face, palm, fingerprint and iris; it is more accurate than face in terms of recognition accuracy and portability. , Palm shape, fingerprint and iris are much higher. Especially compared to fingerprint technology, it is more convenient, hygienic and user-friendly. Finger vein identification can effectively avoid the shortcomings of the security risks of traditional access control systems, and it has opened up a new way to protect the safety of personal property for environmental protection and energy-saving biometric identification technology and products.
3.5mm Wire To Board Connectors
3.5mm Wire To Board Connectors.Standards
Wire-to-board connectors carry approvals from various national and international organizations. In North America, they often bear marks from Underwriters Laboratories (UL) and/or the Canadian Standards Association (CSA).
A wire to board connector for the European marketplace should comply with the Restriction of Hazardous Substances (RoHS) and Waste Electrical and Electronic Equipment (WEEE) directives from the European Union (EU). Wire-to-board connectors that comply with other requirements are also available.
BS 9526 N0001 - Specification for multi-contact edge socket electrical connectors.
3.5mm Wire To Board Connectors
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