The human eye has a spooky ability: It can detect “ghost images”

( Natural News ) Some people claim they can see apparitions, things that aren’t really there, or just straight up ghosts . If you’re a skeptical person, you may chalk it up to fatigue, drunkenness, or even hallucinations — anything but actual ghosts. But there may be a sliver of truth to those claims after all. In a new paper posted on arXiv , scientists in Scotland at Heriot-Watt University in Edinburgh and the University of Glasgow have discovered that the human eye can actually detect “ghost images.” However, these ghost images are far from paranormal entities or anything of the sort. Instead, these ghostly visions appear as gray pixels that have been projected from original images by hitting them with a pattern of light and recording the reflected light with a single pixel. Ghost imaging relies on algorithms to encode images in random patterns. This complicated process was previously thought to be detectable only by computer , but scientists now have evidence that the human eye itself is capable of doing the required computations. Ghost images Ghost imaging has been a highlight in optics research in recent years. So how do “ghost images” work? Think of a typical camera. To create an image, the camera has multiple pixels that take in light from one source, say sunlight, to create an image. In ghost imaging, the process starts with multiple light sources in a predictable array, then the light is collected by a single-point detector, usually called a “bucket.” It works similarly to a LiDAR (light detection and ranging), which is a surveying method that measures the distance to a target by using a single-point laser to scan a scene. The detector captures how the light from the laser bounces back from each spot in the scene – the […]

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