A 2016 trend in smartphone designs was the dual-camera setup and now in 2017 Samsung is catching on too. A patent in Korea has been filed for dual-lens camera configuration. The diagrams in the 37-page document clearly states that Samsung is aiming to enhance the quality of both the background and objects in the foreground.
It seems to work relatively simple. The wide-angle lens scans for anything that is a moving object and if there’s any, the second lens - the telephoto one tracks the image in real time and enables you to adjust zoom and other settings without losing focus.
It is unclear if the technology would be used in the Galaxy S8 or Samsung will need more time before it makes it to an actual product.