Program Allows Ordinary Digital Camera To See Around Corners

An anonymous reader quotes a report from The Guardian: Science may never tell us what lies round the next corner, but researchers have come up with the nearest thing: a computer program that turns a normal digital camera into a periscope. In a demonstration of 'computational periscopy' a U.S. team at Boston University showed they could see details of objects hidden from view by analyzing shadows they cast on a nearby wall. Vivek Goyal, an electrical engineer at the university, said that while the work had clear implications for surveillance he hoped it would lead to robots that could navigate better and boost the safety of driverless cars.

In the latest feat, Goyal and his team used a standard digital camera and a mid-range laptop. The researchers, writing in the journal Nature, describe how they pieced together hidden scenes by pointing the digital camera at the vague shadows they cast on a nearby wall. If the wall had been a mirror the task would have been easy, but a matt wall scatters light in all directions, so the reflected image is nothing but a blur. They found that when an object blocked part of the hidden scene, their algorithms could use the combination of light and shade at different points on the wall to reconstruct what lay round the corner. In tests, the program pieced together hidden images of video game characters -- including details such as their eyes and mouths -- along with colored strips and the letters 'BU.' The program takes about 48 seconds to work out a hidden scene from a digital image, but the researchers believe it could be sped up with a faster computer. Eventually, it may be fast enough to run on video footage. Goyal also said 'it is even conceivable for humans to be able to learn to see around corners with their own eyes; it does not require anything superhuman.'

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