能否对iPhone X的Face ID IR编程以获取全身深度红外图而非仅面部？

Great question—let’s break down why this isn’t feasible, from both hardware and software angles:

Hardware Limitations #

• The TrueDepth camera system (which powers Face ID on iPhone X) is purpose-built for facial recognition. Its infrared dot projector and depth-sensing camera have a narrow field of view focused exclusively on the user’s face. The dot pattern it projects is calibrated to cover only facial features, not a full-body area. There’s no way to reconfigure the hardware to expand this coverage programmatically—it’s a physical design constraint.

Software & API Restrictions #

• Apple’s public APIs (like those in AVFoundation, ARKit, or Vision) only expose facial-specific depth data from TrueDepth. You won’t find any official interfaces that let you access raw sensor data to capture full-body depth.
• iOS’s strict sandbox and security rules prevent low-level access to the TrueDepth system. Even if you tried to reverse-engineer or bypass these restrictions, you’d hit walled garden limitations, and any such code would never pass App Store review (if it even runs at all).

Alternative for Full-Body Depth #

If you need full-body depth mapping on an iOS device, you’d need a model with a LiDAR scanner (iPhone 12 Pro and later, iPad Pro models with LiDAR). ARKit can use the LiDAR sensor to capture depth data for larger areas, including full bodies, via its spatial scanning capabilities.

Hope that clears up the confusion!

内容的提问来源于stack exchange，提问作者Tim