Apple denies reports that Animoji doesn’t require iPhone X’s TrueDepth camera
-苹果否认Animoji不需要iPhone X的TrueDepth camera
However, as Brownlee later tweeted, Animoji actually uses data from the infrared camera and depth sensors for better accuracy. “Apple told me they wouldn’t want a worse Animoji experience for other iPhones without those sensors,” he added.
So how come then that Animoji can sometimes seem like it’s working normally even when parts of the True Depth camera are covered up? And why if you cover the RGB camera, it stops.
Business Insider offers a viable explanation:
Apple’s True Depth camera doesn’t take a 3D reading continuously. Instead, it takes measurements at set intervals, or what’s called a sampling rate, although Apple didn’t comment on the specific sampling rate. When Animoji seem to remain responsive even after the IR sensor is covered, the system could still be going off of an earlier reading.
The first depth reading is taken when the user starts Animoji.
In other words, if you cover up the left side of the notch where the infrared camera is located before using Animoji, performance will be degraded.
iMore acknowledged as much, saying the infrared system on the TrueDepth camera fires periodically to update a crude depth mask while the RGB camera persistently tracks and matches facial movement and expressions.
-苹果认为少了TrueDepth camera，Animoji的辨识会变得很糟糕。
-只靠镜头就能辨识是因为有先红外线扫过脸才遮住红外线，让只有镜头也能运作。
来源：
http://www.idownloadblog.com/2017/11/15/apple-denies-reports-that-animoji-doesnt-require-iphone-xs-truedepth-camera/
https://goo.gl/8aJU1F
不过我刚刚试从解锁到进入Animoji都遮住红外线，
一样能辨识表情。
BTW, Animoji 在低光源的地方还会不堪使用或停摆，
我看基本上..就是用镜头就可以吧XD