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How does the facial recognition technology in smartphone?

In modern smartphones become increasingly integrated face recognition system. But how does it work?

to say that iPhone X opened a new era. The face detection technology, his main "trick". And no one doubts that this method of unlocking will be implemented in many other smartphones.

a Bit of history

In the 1960-ies were conducted special experiments in which the computer was to learn to recognize the man's face. Then it came to no avail, as any emotion led to the failure. Invented the system was afraid of changing lighting conditions.

Лишь в самом конце XX века появились системы, которые научились определять лица людей по фотографиям, запоминая их. При этом они перестали сбоить при появлении усов, бороды, очков и прочих «помех». Aктивнее всего подобные системы начали внедряться в цифровые фотоаппараты. Также они нашли себе место в охранном секторе.

The face recognition system has long been one drawback. They are highly dependent on lighting and angle. However, in security scanners, this problem was not noticeable. To them the face was applied almost flush, then oveseas lamps. To get the same from the aforementioned lack helped the introduction of stereo. Two cameras understand the depth of the scene, therefore the accuracy of multiplies.

How does the facial recognition technology?

Gradually a new feature beginning to appear in smartphones. Here biometric user identification is implemented in order to unlock the device could not the stranger. Ideally, to access personal information can only twin. To worry about it not worth it. Hardly anyone would seriously hide something from his brother or sister. And nobody hinders to read any particularly sensitive information additional password.

The system of facial recognition in smartphones can be divided into four phases:

  1. The person scanning. It is implemented by using front camera or, as in the case of iPhone X, a special sensor. The scanning is three-dimensional, so focus showing pictures will not work.
  2. Extracting unique data. The system focuses on a set of characteristics of the scanned face. Most often it is the contours of the eye sockets, the cheekbones and the width of the nose. In advanced systems can also "noticed" scars.
  3. Retrieving from the memory template with the previously obtained data.
  4. Matching. The final stage at which the system decides whether to unlock the display. Power of modern processors allow you to spend on "reflection" in a split second.

The face detection function can be implemented even if the front-facing camera — if only it had two lenses. However, in this case this function will be unstable. The fact that only special sensors will provide the person scanning even in the dark, while the "frontalka" requires bright lighting. Also, special virtual sensor output at the face more points, so they work even with the appearance of a beard, glasses, and other obstructions. In short, in any MOVES 2 Mix the system will work much worse than in iPhone X. Another thing — the anniversary the Apple product is much more expensive than all the other smartphones with face detection.

For the technology of the future?

Need to scan the faces of the sensors require a perfect installation. The shift in hundredths of a millimeter will lead to what job functions will cease to be perfect — therefore, in the production of the smartphone, you may experience an increased output of marriage, and this leads to an increase in its value. Even the sensors are very expensive, they only uses Apple, although no patents it does not.

In short, while the face detection function manufacturers "androids" will be implemented through the front camera. Now it can be found in Samsung Galaxy Note 8 and S8. But the owners of these devices will confirm that it doesn't work well — easier to use fingerprint. So far on the future as nothing can be said. Need to wait will Apple implement these sensors in more affordable smartphones, and will also appear in Android devices.

Conclusion

Переживать по поводу сохранения ваших идентификационных данных не стоит. Созданный при сканировании лица шаблон находится в отдельном разделе памяти — чтение этого сектора компьютером или сторонними программами невозможно. Впрочем, это касается и отпечатков пальцев. A каким видом идентификации пользоваться удобнее — это выбирать только вам.

've kept you ever in the hands of a smartphone, able to recognize a face? And whether you expect the mass implementation of this function? Share your opinion in the comments, we'd be glad to!

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