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Page 2 Making Things Invisible……….

Powerpoint Templates Page 3 Introduction To Optical Camouflage Requirements of Optical Camouflage Working of Optical Camouflage Applications of Optical Camouflage

 With recent advances in optics and computing and advent of flexible electronic like liquid crystal display can allow back ground image to be displayed on the material itself.  Although more encumbering and complicated than Harry Potter’s invisibility.  However it is a cool piece of technology with many interesting applications

Powerpoint Templates Page 5  Camouflage is the concealment of otherwise visible objects by any method or combination of methods that allows them to remain unnoticed.  Optical camouflage is a hypothetical type of active camouflage.  It altogether renders invisibility by slipping beneath the shining, silvery cloth.

 By projecting background image on to the masked object, you can observe the masked object just as if it were virtually transparent.  The concept is to create the illusion of invisibility by covering an object with something that projects the scene directly behind that object.  Uses RETRO REFLECTIVE PROJECTION TECHNOLOGY(RPT)

 Three key techniques of RPT are the followings: 1. To use an object covered by retro-reflective material as a screen 2. Make the projector's iris as small as possible (by using a pinhole). 3. To place a projector into a position optically conjugated with the observer's eye by using a halfmirror.

Page 8 A Garmet made from highly Reflective Material (Cloak) A Video Camera A Computer A Projector A Special half Silvered mirror (Combiner) Requirements For Invisibility…

1. C LOAK  The cloak is made from a special material known as retro-reflective material creating a SPECULAR REFLECTION, is in which incident light rays and reflected light rays form the exact same angle with the mirror surface.  It creates an illusion of invisibility by acting like a screen.  Covered with thousands of small beads  They bounce the light rays exactly in the same direction as that of incident angle.

2. V IDEO C AMERA  It caputres the background image. Note: For easier illustration of working we had used these common known images, in real time optical Camouflage the device size will be smaller than that of actual size like spy cams, tablets  The video camera is placed behind the person wearing the cloak.

3. C OMPUTER  To capture the image from the video camera Note: For easier illustration of working we had used these general images, in real time optical Camouflage the device size will be smaller than that of actual size like spy cams, tablets  It will add some Graphics to the received video

Hardware/software(calculation of approximate perspective simulation,transformation) captured image(video camera) Projected (on to the cloak) Synthesize graphics Superimpose on to the Real world

4. P ROJECTOR  It projects the modified image onto the cloak.  A projector accomplishes this task by shining a light beam through an opening controlled by a device called an iris diaphragm.  An iris diaphragm is made of thin, opaque plates.  Turning a ring changes the diameter of the central opening Note: For easier illustration of working we had used these common known images, in real time optical Camouflage the device size will be smaller than that of actual size like spy cams, tablets

5. C OMBINER  The system requires a special mirror that both : Reflects the projected image toward the cloak and Lets the light rays bouncing off the cloak return to the user's eye.  This special mirror is called a beam splitter, or a combiner.  It should be properly positioned in front of user’s eye. Note: For easier illustration of working we had used these common known images, in real time optical Camouflage the device size will be smaller than that of actual size like spy cams, tablets

Video Camera Computer ProjectorCombiner Retro- Reflective Material (Cloak)

W ORKING OF O PTICAL C AMOUFLAGE

Free Powerpoint Templates Page 18

 Optical see-through displays look like high-tech goggles providing a display and optics for each eye.  Video see-through displays use video-mixing technology to combine the images from a head-worn camera with computer-generated graphics.

Applications Mutual Tele-Existance Used For Military Purposes Used For Medical Purpose Using in Aeroplanes Using in Cars Creating Windows for Windowless Rooms

Mutual Tele- Existance

Military Applications Making the Aircrafts and War Vehicles Invisible during the war Time

Page 23 Military Applications

Page 24 Military Applications

Medical Applications Doctors performing surgery could use optical camouflage to see through their hands and instruments to the underlying tissue.

Free Powerpoint Templates Page 26 In Aeroplanes

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.

Powerpoint Templates Page 28 In Cars and Lorries 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.

Free Powerpoint TemplatesPage 30 Windows for a Windowless Rooms By Placing the Projector on the wall we can create a movable window i.e we can place this window where ever we wish

 Each technology has its own pace of development.  This technology is still at development reasearch work is going on and soon we have astonishing results.  It should be used in the right application so that it can be explored in a better way so it can be useful for the human life.