In recent ARM SoC, we notice one thing: all the chips manage four cameras. At first glance, one might ask the interest to support many sensors: recent smartphones usually have only two sensors, one on the back, for the photo, and a front for videophone functions. And yet, a fashionable technology to benefit fully from four sensors: the stereoscopic 3D.
Indeed, a device with a conventional SoC who wants to take pictures in 3D will abandon the de facto front camera, because the stereoscopic 3D requires two sensors. With four sensors, it is possible to provide devices capable of taking photos and filming in 3D on the back of the smartphone and on the front.
And propose the 3D video telephony is a good way "marketing" to sell ... 
Indeed, a device with a conventional SoC who wants to take pictures in 3D will abandon the de facto front camera, because the stereoscopic 3D requires two sensors. With four sensors, it is possible to provide devices capable of taking photos and filming in 3D on the back of the smartphone and on the front.
And propose the 3D video telephony is a good way "marketing" to sell ...
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