How does it work? | Iris scanner

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2017-06-29 18:00:06

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The Technology of scanning an iris of the eye was first proposed in 1936 by ophthalmologist Frank Bursh. He said that the iris of each person is unique. The probability of coincidence is about 10 to the minus 78 degrees, which is significantly higher than with fingerprinting. According to the theory of probability, in the history of mankind has ever had two people who would have matched the pattern of the eye. In the early ' 90s, John Darman of the company Iridian Technologies patented algorithm to detect differences in the iris of the eye. At the moment, this method of biometric authentication is one of the most effective and are made using a special sensor — iridescence. How it works — this was in today's issue!

Iris is a thin movable diaphragm with a pupil in the center, which is located behind the cornea in front of the lens of the eye. It is formed before birth and never changes throughout life. The texture of the iris is similar to the network with a large number of rounds, while its pattern is very complex, allowing you to select around 200 points, which ensures a high degree of reliability of authentication.

The Scanner of the iris of the eye often erroneously referred to as a retinal scanner. The difference lies in the fact that the retina is located inside the eye and to scan its optical sensor is impossible, only with the help of infrared radiation. It looks at the retina, and the pattern of blood vessels of the fundus. To call such a sensor iridocorneal wrong, as iris is the iris, the retina also has the title of the retina.

At the heart of iridescence modern smartphone is a high-contrast camera like a real camera. Sometimes the role of the scanner of the iris can perform basic front camera. The authentication process starts with obtaining detailed images of the human eye. For this purpose, use a monochrome camera with a dim light, which is sensitive to infrared radiation and allows you to work in low light conditions. Usually a series of several photographs, as the pupil is sensitive to light and constantly changes its size. Then, from the selected one of the most successful, define the boundary of the iris and the control area. To each point of the selected area, use special filters to extract the phase information and convert the graphic shell into a digital format. Glasses and contact lenses, even colored, do not affect the quality of authentication.

The Introduction of the scanner iris in smartphones started in 2015. First it was set to Chinese and Japanese manufacturers. In particular the pioneer was the ViewSonic V55, and are not enrolled in the mass market. Of the newest devices equipped with iridocorneal, you can select Samsung Galaxy S8, however, the scanner is easily able to deceive hackers, respecatable the photo on the printer and put on her contact lens.

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