DEEPA: OPTICAL CAMOUFLAGE

DEEPA: OPTICAL CAMOUFLAGE: "OPTICAL CAMOUFLAGE Invisibility has been on humanity's wish list for a long time. With recent advances in optics and computing an..."

OPTICAL CAMOUFLAGE

OPTICAL CAMOUFLAGE

        Invisibility has been on humanity's wish list for a long time. With recent advances in optics and computing and with the advent of flexible electronics such as a flexible liquid crystal display, that would allow the background image to be displayed on the material itself, however, this elusive goal is no longer purely imaginary.

 In 2003, three professors at University of Tokyo — Susumu Tachi, Masahiko Inami and Naoki Kawakami — created a prototypical camouflage system in which a video camera takes a shot of the background and displays it on the cloth using an external projector. They can even reflect images when the material is wrinkled. The same year Time magazine named it the coolest invention of 2003. It is an interesting application of optical camouflage and is called the Invisibility Cloak. Through the clever application of some dirt-cheap technology, the Japanese inventor has brought personal invisibility a step closer to reality.

         Their prototype uses an external camera placed behind the cloaked object to record a scene, which it then transmits to a computer for image processing. The key development of the cloak, however, was the development of a new material called retro reflectum. Professor Tachi says that this material allows you to see a three-dimensional image. The computer feeds the image into an external projector which projects the image onto a person wearing a special retro reflective coat. This can lead to different results depending on the quality of the camera, the projector, and the coat, but by the late nineties, convincing illusions were created. That was only one invention created in this field and researches are still being carried out in order to implement it using nanotechnology.   

Optical camouflage is a kind of active camouflage which completely envelopes the wearer. It displays an image of the scene on the side opposite the viewer on it, so that the viewer can "see through" the wearer, rendering the wearer  invisible. The idea is relatively straightforward: to create the illusion of invisibility by covering an object with something that projects the scene directly behind that object. If you project background image onto the masked object, you can observe the masked object just as if it were Virtually transparent.

Optical camouflage can be applied for a real scene. In the case of a real scene, a photograph of the scene is taken from the operator’s viewpoint, and this photograph is projected to exactly the same place as the original. Actually, applying HMP-based optical camouflage to a real scene requires image-based rendering techniques.

As for camouflage, it means to blend with the surroundings. Camouflage is the method which allows an otherwise visible organism or object to remain indiscernible from the surrounding environment. Examples include a tiger's stripes and the battledress of a modern soldier. Camouflage is a form of deception. The word camouflage comes from the French word 'camoufler' meaning 'to disguise'. The camouflage technique of disguise is not as common as coloration, but can be found throughout nature as  well. 

Animals may disguise themselves as something uninteresting in the hopes that their predators will ignore them or as something dangerous so that predators will avoid them. And so had humans the desire to disguise themselves just as some animals could do. 19th century armies tended to use bright colors and bold, impressive designs. These were intended to daunt the enemy, attract recruits, foster unit cohesion, or allow easier identification of units in the fog of war. The transfer of camouflage patterns from battle to exclusively civilian uses is a recent phenomenon. The concept of camouflage - to conceal and distort shapes - is also a popular artistic tool.

OPTICAL CAMOUFLAGE

Invisibility has been on humanity's wish list for a long time. With recent advances in optics and computing and with the advent of flexible electronics such as a flexible liquid crystal display, that would allow the background image to be displayed on the material itself, however, this elusive goal is no longer purely imaginary.

 In 2003, three professors at University of Tokyo — Susumu Tachi, Masahiko Inami and Naoki Kawakami — created a prototypical camouflage system in which a video camera takes a shot of the background and displays it on the cloth using an external projector. They can even reflect images when the material is wrinkled. The same year Time magazine named it the coolest invention of 2003. It is an interesting application of optical camouflage and is called the Invisibility Cloak. Through the clever application of some dirt-cheap technology, the Japanese inventor has brought personal invisibility a step closer to reality.

Their prototype uses an external camera placed behind the cloaked object to record a scene, which it then transmits to a computer for image processing. The key development of the cloak, however, was the development of a new material called retro reflectum. Professor Tachi says that this material allows you to see a three-dimensional image. The computer feeds the image into an external projector which projects the image onto a person wearing a special retro reflective coat. This can lead to different results depending on the quality of the camera, the projector, and the coat, but by the late nineties, convincing illusions were created. That was only one invention created in this field and researches are still being carried out in order to implement it using nanotechnology. 

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