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Pure dry: seven security biometrics full resolution

So-called biometrics is, through the computer and optical, acoustics, biological sensors and biological closely combined with statistical principles and other high-tech means, using physiological features, inherent body (such as fingerprint, face, iris, etc) and behavior characteristics, such as handwriting, voice, gait, etc.) for identification of personal identity. 
 
Biometric technology according to the body‘s own characteristics, such as fingerprints, voice to identify individuals. At present, there are a lot of biometric technology can be used for authentication. Here, we describe the most popular biometric technology is how to work, and screenshots, extract features, comparison and matching function with a simple comment. 
 
1, iris recognition technology 
 
Iris is a pupil in the eye of the fabrics of all kinds of rings, each iris contains a unique based on like a crown, crystalline, filaments, spots, the structure, pits, ray, wrinkles and stripe structure characteristics, according to claim, no two iris is the same. Iris scanning security system consists of a fully automatic camera to find when your eyes and find iris, began to focus on, want to blink to cheat the system. 
 
advantages 
 
Making it easy for users to use; May is the most reliable biometric technology, though it has not yet been tested; Only users in the equipment before without physical contact. 
 
disadvantages 
 
One of the most important drawback is that it has not conducted any tests, the iris recognition system just using the statistics theory small-scale experiment was carried out, and the uniqueness of the real world will not for certification test; It is hard to the size of the image acquisition device miniaturization; Due to focus on the needs of expensive camera, one of these cameras lowest quotation is $4000; Lens could make the image distortion and the reliability greatly reduced; Black eyes very difficult to read; Need a good light source. 
 
2, retina identification technology 
 
Retina was used is also a kind of biometric features, some people think that the retina is more unique than iris biometric, laser eye retina identification technology requirements for the back of the retina characteristics of uniqueness. 
 
advantages 
 
The retina is a kind of extremely fixed biological characteristics, because it is "hidden", so can‘t wear, aging, or for the disease; The user does not need to direct contact and equipment; 
 
Is a most difficult cheating the system because the retina is not visible, it will not be fake. 
 
disadvantages 
 
The retina technology without any test. Obviously, the retina technology may bring health damage to the user, this requires further study; For consumers, the retina technology unattractive; It is difficult to further reduce the cost of it. 
 
3, facial recognition 
 
Facial recognition technology based on facial features and the relationship between them, to identify recognition technology based on these unique characteristics are very complex, it requires knowledge of artificial intelligence and machine learning system, is used to capture facial image of the two technologies for the standard video and thermal imaging technology. Standard video technology through a standard camera absorb facial image or a series of images, caught in the face, after some emphasis is recorded, for example, 
 
The position of the eyes, nose and mouth, and the relative position between them were recorded and then form template; Thermal imaging technology based on the analysis of produced by facial blood capillary blood hotline to produce facial images, and video camera, thermal imaging technology does not need to be in a good light conditions, so even in the dark cases can also be used. An algorithm and a neural network system with a conversion mechanism can be a picture of a fingerprint image into digital signal, and eventually produce match or not match the signal. 
 
 
advantages 
 
Face recognition is contact, users do not need to contact with equipment directly; Although you can use the desktop video camera, but only a more advanced camera can effectively capture high-speed facial images; 
 
disadvantages 
 
The location of the users face with the surrounding light environment may affect the accuracy of the system; Most of the research of biometric recognized facial recognition is the least accurate, is also the most easily deceived; Facial recognition technology improvement depends on the feature extraction and matching technology, and the acquisition of image equipment will be much more expensive than its technology; Due to human body, such as hair ornaments, aging and other changes may need to be compensated by artificial intelligence, machine learning function must constantly will be used to get the image and now get compare; To improve the core data and make up for the tiny difference; It is difficult to further reduce the cost of it, we must to expensive to sell high quality equipment. 
 
4, signature recognition 
 
Signature as a means of identity authentication has been used for hundreds of years, and we are familiar with the format of the form in the bank in the signature as a symbol of our identity. The digital signature is such a process, measuring action throughout the signature, as well as the image itself in different speed between each letter and a letter, order and pressure, signature recognition and voice recognition, determination of learning is a kind of behavior. 
 
advantages 
 
Use the signature recognition is more likely to be acceptable, and it is an accepted identification technology. 
 
disadvantages 
 
As the growth of the experience, the lifestyle change with the change of temperament, the signature will also along with the change; In order to deal with the signature cannot be cleared from the natural change, we must do to compromise in security; Because the speed of the signature, we can‘t use it on the Internet. Used for signing the tablets of complex and expensive, because the resolution of the and laptop touchpad is a big difference, we is technically difficult to combine the two; It is hard to its size miniaturization.