Ask HN: Is there technical reasoning behind Animoji being exclusive to iPhone X?

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To what extent, if any, is Animoji dependent on the camera and sensor system specific to iPhone X? Would there be a noticeable quality difference if it was available on other iPhones?

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Not really. You can still extract facial features from normal video (Snapchat does it too). Maybe not as exact, but still usable to animate some emojii.. I guess.

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