![]() "The coolest thing is a wall really can be used as a mirror," Goyal said. Off to the side was a digital camera, which couldn't see the LCD screen but could take pictures of the shadow on the wall. They then placed a small rectangular sheet in front of the screen, casting a shadow onto a matte white wall. Goyal, and engineers Charles Saunders and John Murray-Bruce, also at Boston University, used an LCD screen to display several illuminated cartoon images. "But we don't think about how we can extract information from those shadows." Test your mind and see if you can find out all of them. Each of these pictures comprise of hidden figures in them. "We see shadows around us all the time," Goyal said. Today’s compilation displays 25 crazy and mindboggling optical illusion pictures. One trick, it turns out, is to examine the shadows the hidden object might cast. Ideally, you would take that scattered light, figure out where each beam came from, and reconstruct the reflected image.īut like Humpty Dumpty, it's nearly impossible to put such a scattered image back together again. Can you find the hidden shapes in this picture Help this cute critter categorize all the crazy circles, squares and rectangles that are right beneath his. The difference is that instead of the periscope's mirrors, which reflect a sharp image, there's a wall that scatters light, which usually produces a diffuse glow. The way researchers are trying to see around corners is similar to how submarine crews use periscopes to see above water. (MORE: Incredible shrinking method collapses structures to the nanoscale) ![]() "You don't need thousands of dollars of equipment to achieve non-line-of-sight imaging," said Vivek Goyal, an electrical engineer at Boston University and one of the three authors of the new paper. But while other methods require expensive lasers and light-detection systems, the new technique uses equipment that ordinary consumers could buy. This ability to see around corners isn't new. The new experiment, published Wednesday in Nature, is the latest in a growing effort to develop ways to see around corners - technology that could someday be useful for everything from self-driving cars and medical imaging to monitoring hazardous environments and performing military reconnaissance. Some may look like formless blobs, but researchers are now showing that even indistinct shapes could reveal what's hidden around the corner, no fancy equipment required.īy using an ordinary digital camera and a computer to analyze a shadow that's reflected off a normal white wall, the researchers can reconstruct a scene that's hidden from a camera's line of sight.
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