presented by:
P. RAJESWARI

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OPTICAL CAMOUFLAGE
abstract
This paper describes a kind of active device camouflage system named optical camouflage. While new high-performance, light-aerogel and light-transmitting concrete compel us to question the nature of solidity, a new technology developed by University of Tokyo seeks to make matter disappear altogether. Scientists at Tachi Laboratory have developed Optical Camouflage, which utilizes a collection of devices working in concert to render a subject invisible.
Although more encumbering and complicated than Harry Potter's invisibility cloak, this system has essentially the same goal, rendering invisibility by slipping beneath the shining, silvery cloth. Optical Camouflage uses the Retro-reflective Projection Technology, a projection-based augmented–reality system composed of a projector with a small iris and a retroreflective screen. The object that needs to be made transparent is
painted or covered with retroreflective material. Then a projector projects the background image on it making the masking object virtually transparent.
introduction
Optical camouflage is a hypothetical type of active camouflage currently only in a very primitive stage of development. The idea is relatively straight forward: to create the illusion of invisibility by covering an object with something that projects the scene directly behind that object.First, the person who want be invisible (let’s call his person A) dons a garment. That resembles a hooded raincoat .The garment is made of a special material. Next, an observer (person B) stands before a person A at a specific location. At that location ,instead of seeing person A wearing a hooded raincoat ,person B sees right through the cloak, making person A appear to be invisible. If person B were viewing from a slightly different location, he would simply see person A wearing a silver garment. Still, despite its limitations, this is a cool piece of technology