While most recent phones come with dual rear cameras to capture depth and deliver Portrait Mode-style shots with the background separated from the foreground, Google’s Pixel phones achieve the same effect with a single lens. That applies to the new Pixel 3 as well, and the company’s now explained how this functionality works – and why it used a rig consisting of five phones to perfect it. For Portrait Mode-style shots on the Pixel 2, Google used a neural network-powered Phase Detection Autofocus (PDAF) system. It works on a concept called Parallax, in which the camera captures two images from…

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