A team of scientists at the University of Rochester in New York demonstrated that an invisibility Cloak can be used to hide what it’s cloaking. The same mathematical framework was used to create the Rochester Cloak. They were also able to use flat-screen displays that could extend the angles at which the target object was hidden. Joseph Choi from Rochester’s Institute of Optics, and John Howell from Chapman University, California explained how Cloaks of arbitrarily shaped Cloaks work in Optica (citation above). Two of his fingers have disappeared. Researchers at Rochester already showed how basic optics can be used to cloak a person. (Image: rochester.edu) Cloaking devices may soon become available The authors believe their method could soon be used with commercially-available digital devices. Although the scientists are able to demonstrate a proof of concept for this setup, it is significantly less detailed than that achieved by the Rochester Cloak lens. The ‘digital integral Cloak’ that they have described will improve as more high-resolution displays become possible. It is simple and effective in hiding an object from the public eye. It is however limited in its ability to conceal large objects from view. Larger lenses would be required. The vertical rod has disappeared. The scientists developed a digital display method to allow for greater coverage of different angles and conceal larger objects. The authors explain that it’s possible to make the data smaller and use digital cameras or digital displays by breaking down the data. A new method hides objects from multiple angles. Howell and Choi used their camera to scan the background. Then, they encoded the data so that each pixel of the screen provided a unique view for an observer at a particular position. They were able to create multiple images by using lenticular lens – which is a plastic sheet with a series of thin, semi-cylindrical lenses that are parallel to each other – of the background. Each image corresponds to a different viewer. The background would move in accordance with the viewer’s movements, just like a screen. The current system took Professor Howell and Mr. Choi several minutes each to scan and process the image and then update it. Choi said that they should be able do it in real time, even at a lower resolution. A new method cloaks objects moving in motion. Their proof-of concept setup and mathematical framework also show how an object can be covered, regardless of its size. As long as it does not alter or deform, the object’s shape will remain the same. Joseph Choi has his eye cloaked. J.K. Rowling didn’t know that her Harry Potter books would be cloaked. Image: Rochester.edu. To accomplish this, the one-side of the target object would be covered with an array sensors. This effectively covers several cameras. The other side would then be covered in pixels and minuscule lenses. Choi and Howell could use their method to determine which sensors must be fed into which pixels in order to display the background. Advertising has used a similar trick, but only for one angle. The Rochester group set up a system that allows a car to be invisible from multiple positions. This is in addition to making it visible only to one person at a given position. The scientists described the article’s main content in an abstract. They wrote that they had demonstrated a 2-D planar and ray optical, digital cloak using lenticular lense. This is similar to integral imaging for 3-D displays. The resolution limitations associated with a digital veil can be reduced by continuing advances in digital technology. Citation: Joseph S. Choi, John C. Howell. Optica, Volume 3, Issue 5, pages 536-540. May 2016. DOI: 10.1364/OPTICA.3.000536. Video: The Rochester Digital Cloak Choi and Howell used the same mathematical framework to create the Rochester Cloak. They were able to make flat-screen displays that could be used to hide angles.
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