【 iPhone Face ID 的真正面貌是这么样的】
大多数人认为 iPhone 解锁只需快速拍摄一张平面自拍即可。但事实远比这复杂精妙得多。

苹果公司巧妙地将一个微型地形扫描仪隐藏在屏幕内部。大家都以为这是激光雷达 (LiDAR) 的工作原理，但并非如此。激光雷达通过在整个房间内反射激光来测量距离。而 Face ID 则依靠原深感 (TrueDepth) 系统，利用结构光实现极高的近距离精度。

以下是毫秒级的隐形过程：

• 一个微型投影仪将超过 30,000 个红外点投射到你的脸上。
• 红外摄像头读取这些点在你面部特征周围的弯曲情况。
• 处理器将这种弯曲的网格转化为完美的 3D 网格。
它在完全黑暗的环境下绘制你的面部轮廓，并随着你的年龄增长或风格变化而主动学习你的面部特征。科技行业总是吹嘘复杂的硬件规格，但苹果公司却明白一个非常简单的道理：硬件创新的终极境界在于让用户完全察觉不到它的存在。
This is what Face ID really looks like on iPhone

Most people think their iPhone just takes a quick flat selfie to unlock. The reality is far more complex and brilliant.

Apple essentially hid a microscopic topography scanner inside your screen. Everyone assumes this is LiDAR at work but it is not. LiDAR measures distance by bouncing lasers across an entire room. Face ID relies on the TrueDepth system instead to achieve extreme close up accuracy using structured light.

Here is the invisible process happening in milliseconds:
• A tiny projector fires over 30,000 infrared dots onto your face.
• An infrared camera reads how those dots bend around your facial features.
• The processor turns that warped grid into a flawless 3D mesh.

It maps you in total darkness and actively learns your face as you age or change styles. The tech industry constantly brags about complicated hardware specs but Apple understood a very simple truth. The ultimate flex in hardware innovation is making it completely invisible to the user. http://t.cn/AXJnXjtX