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C. VIBHAVINIMD. SALMAN
PRESENTATION BY:
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OPTICAL CAMOUFLAGEMaking Things Invisible……….
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Introduction To Optical Camouflage
Requirements of Optical Camouflage
Working of Optical Camouflage
Applications of Optical Camouflage
HIGHLIGHTS
INTRODUCTION
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 acool piece of technology with manyinteresting applications
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WHAT IS OPTICAL CAMOUFLAGE ?
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.
PRINCIPLE INVOLVED
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)
KEY TECHNIQUES OF 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.
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• 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. CLOAK
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. VIDEO CAMERA
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. COMPUTER
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
HOW IT WORKS ?
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. PROJECTOR
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. COMBINER
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
VideoCamera Computer Projector Combiner
Retro- Reflective Material (Cloak)
WORKING OF OPTICAL CAMOUFLAGE
Head Mounted Displays
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
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Military Applications
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Military Applications
Medical Applications
Doctors performing surgery could use optical camouflage to see through their hands and instruments to the underlying tissue.
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.
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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.
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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
Conclusion
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.
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ANY QUERIES…
Thank You
