【智能手机即使在完全黑暗的环境下也能识别你的脸？】

方法如下。🌑📱

你的眼睛什么也看不见。但你的手机却能识别你。

而这其中的奥秘在于红外光、3D 映射和人工智能的巧妙结合。🤯

以苹果的 Face ID 为例。当你看着你的 iPhone 时，奇妙的事情会在瞬间发生。

🔴 第一步：你的手机用不可见光照亮你的脸。

红外照明器会将光投射到你的脸上。与可见光不同，红外辐射对人眼是不可见的。

因此，即使在完全黑暗的房间里，你的脸也能在你毫无察觉的情况下被照亮。

🔴 第二步：它会将数千个不可见的光点投射到你的脸上。

一个微型投影仪会投射超过 30,000 个红外光点，在你的面部特征上形成一个结构化的图案。

红外摄像头会捕捉到这个图案如何因你脸部的独特几何形状而发生扭曲。

这样就能生成一张精细的 3D 深度图。

🔴 第三步：AI 识别您的面部几何结构。

神经网络会处理采集到的信息，并将其与安全存储在您设备上的面部数学模型进行比较。

即使您留了胡子、换了发型或戴了眼镜，它也能识别出您，这真是太棒了！

所有这一切都在几毫秒内完成。

您的手机无需像人眼那样“看到”您。它利用人眼无法感知的电磁波谱的一部分，主动照射并测量您的面部。

红外传感和 3D 映射的基本原理同样适用于机器人、自主系统和人机交互领域。👁️
Your smartphone recognize your face in complete darkness. Here is how. 🌑📱

Your eyes see nothing. But your phone can still see you.

And the secret is a fascinating combination of infrared light, 3D mapping, and artificial intelligence.🤯

Take Apple's Face ID, for example.When you look at your iPhone, something remarkable happens in a fraction of a second.

🔴 Step 1: Your phone illuminates your face with invisible light.

An infrared illuminator projects light onto your face. Unlike visible light, infrared radiation is invisible to the human eye.

So even in a completely dark room, your face can be illuminated without you noticing.

🔴 Step 2: It projects thousands of invisible dots onto your face.

A tiny projector casts more than 30,000 infrared dots, creating a structured pattern across your facial features.

An infrared camera captures how this pattern is distorted by the unique geometry of your face.

This results in a detailed 3D depth map.

🔴 Step 3: AI recognizes your facial geometry.

A neural network processes the captured information and compares it with the mathematical representation of your face stored securely on your device.

It can recognize you even when you grow a beard, change your hairstyle, or wear glasses, and this is quite remarkable!

And all of this happens in milliseconds.

Your phone doesn't need to *see* you the way humans do. It actively illuminates and measures your face using a part of the electromagnetic spectrum that our eyes cannot perceive.

The same underlying principles of infrared sensing and 3D mapping have applications in robotics, autonomous systems, and human-machine interaction. 👁️ http://t.cn/AXlNYPVT