OPTICAL CAMOUFLAGE - Invisibility Cloak. PREMJITH P.G S7, EEE Optical Camouflage-Invisibility Cloak

What is Optical Camouflage? It’s developed by scientists at the University of Tokyo. Optical camouflage is a kind of camouflage in which one wears a cloth which projects the background so that he appears somehow invisible. Optical Camouflage-Invisibility Cloak

What is Invisibility Cloak? The invisibility cloak renders the human partially invisible, when he/she slips beneath the shining, silvery cloak. Optical Camouflage-Invisibility Cloak

Invisibility Cloak is now a reality. Optical Camouflage-Invisibility Cloak

How Invisibility Cloak is Real? Optical camouflage requires a complicated arrangement. First, the person who wants to be invisible (Person A) wears the cloak. An observer (Person B) stands before (Person A) at a specific location. At that location, (Person A) appear to be partially invisible to (Person B). If (Person B) were viewing from a slightly different location, he would simply see (Person A) wearing a cloak. Optical Camouflage-Invisibility Cloak

The Invisibility Cloak The cloak that enables optical camouflage to work is made from a special material known as retro-reflective material. Optical Camouflage-Invisibility Cloak

Retro-Reflectivity : Optical Camouflage-Invisibility Cloak

Principle : Optical camouflage doesn't work by way of magic. It works by taking advantage of something called augmented-reality technology. Optical Camouflage-Invisibility Cloak

Augmented Reality : Augmented reality merely tries to supplement real world with additional, helpful content. Optical Camouflage-Invisibility Cloak

Requirements : A garment made from highly reflective material A video camera A computer A projector A special, half-silvered mirror called a combiner Optical Camouflage-Invisibility Cloak

The Complete System : Optical Camouflage-Invisibility Cloak

Video Camera : Capturing the background image requires a video camera, which sits behind the person wearing the cloak. The video from the camera must be in a digital format so it can be sent to a computer for processing. Optical Camouflage-Invisibility Cloak

Computer : All augmented-reality systems rely on powerful computers to synthesize graphics and then superimpose them on a real-world image. Optical Camouflage-Invisibility Cloak

Computer : For optical camouflage, the Computer must take the image from the video camera, calculate the appropriate perspective to simulate reality to be projected onto the retro-reflective material. Optical Camouflage-Invisibility Cloak

Projector : For optical camouflage, the central opening must be the size of a pinhole. This ensures a larger depth of field so that the cloak can be located any distance from the projector. Optical Camouflage-Invisibility Cloak

Combiner : A special mirror to both reflect the projected image toward the cloak and to let light rays bouncing off the cloak return to the user's eye. This special mirror is called a beam splitter, or a combiner. Optical Camouflage-Invisibility Cloak

Combiner : The combiner allows the user to perceive both the image enhanced by the computer and light from the surrounding world. Optical Camouflage-Invisibility Cloak

Combiner : Combiner is critical because the computer-generated image and the real-world scene must be fully integrated for the illusion of invisibility to seem realistic. Optical Camouflage-Invisibility Cloak

Real World Applications Pilots landing a plane could use this technology to make cockpit floors transparent. This would enable them to see the runway and the landing gear simply by glancing down. Optical Camouflage-Invisibility Cloak

Real World Applications Doctors performing surgery could use optical camouflage to see through their hands and instruments to the underlying tissue. Optical Camouflage-Invisibility Cloak

Real World Applications Providing a view of the outside in windowless rooms is one of the more fanciful applications of Optical Camouflage. Optical Camouflage-Invisibility Cloak

Real World Applications Drivers backing up cars could benefit one day from optical camouflage. A quick glance backward through a transparent rear would make it easy to know when to stop. Optical Camouflage-Invisibility Cloak

The target can only be in a certain field of view Disadvantages : Surface is used as the reflector will be having the natural folds and wrinkles in the material. The target can only be in a certain field of view Optical Camouflage-Invisibility Cloak

Requires Expensive Equipments. Disadvantages : Partial Invisibility Requires Expensive Equipments. Optical Camouflage-Invisibility Cloak

Conclusion : Although this is having some disadvantages, Optical Camouflage is a nice technology. However further developments are being going on. I believe this is going to change the entire world. Optical Camouflage-Invisibility Cloak