Transcript Optical Camouflage - 123seminarsonly.com

Optical Camouflage
Presented by,
PRAVIN. M
R745
This is what it really does…
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What is Optical Camouflage??
 It is developed by three scientists at the university of
Tokyo.
 Camouflage means to blend with the surroundings.
 Optical Camouflage is a kind of camouflage in which, one
wears a cloth which projects the background so that he
appears somehow invisible.
 It provides invisibility only in the visible portion of the
spectrum.
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Retro-reflective Material
 The cloak that enables, optical Camouflage to work is
made from a special material known as retro-reflective
material.
 Retro-reflective material is covered with thousands of
small beads.
 When light rays strike any of these beads, they are
reflected back exactly in the same direction from which
they came.
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Light Surface Reflectivity
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Retro-reflectivity
 In retro reflection the glass
beads act like prism,
bending the light rays by a
process known as
refraction.
 An observer situated at
the light source receives
more of the reflected light
and hence a brighter
reflection.
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Principle of Optical Camouflage
 Optical camouflage works by taking advantage of
something called augmented-reality technology.
 Augmented reality system’s add computer generated
information to a user’s sensory perceptions.
 Augmented reality system’s are not the same as virtual
reality system’s.
 Augmented reality system’s require that the users view
through a special viewing apparatus.
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REQUIREMENTS
A garment made from retro-reflective
material.
A video camera.
A computer.
A projector.
A special half silvered mirror called a
combiner.
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Combiner:
 It is also called beam-splitter.
 It reflects the projected image towards cloak.
 It lets light rays bouncing of the cloak to the user’s eye.
 Allows the user to perceive both image enhanced by
computer and surrounding light.
 Both computer generated image and real world scene must
be fully integrated.
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The Complete System
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How does it work??
 The person who wants to be invisible wears the cloak
made of retro-reflective material.
 A digital video camera captures the scene behind the
person wearing the cloak.
 The computer processes the captured image.
 The projector receives the enhanced image from the
computer and shines the image through a pin-hole sized
opening onto the combiner.
contd. . .
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How does it work??
 The silver half of the mirror which is completely reflective,
bounces the projected image towards the person wearing
the cloak.
 The cloak reflects light directly back to the mirror.
 Light rays bouncing off of the cloak pass through the
transparent part of the mirror and falls on the user’s eye.
 Hence, the person wearing the cloak appears partially
invisible.
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Real World Applications
 Pilots landing a plane
could use this technology
to make the cockpit
floors transparent.
 This enables them to see
the runway simply by
glancing down.
Contd. . .
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Real World Applications
 Drivers backing up cars
could benefit from optical
camouflage.
 A quick glance backward
through a transparent rear
would make it easy to
know when to stop.
Contd. . .
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Real World Applications
 Doctor performing surgery could see through their hands
and instruments to the underlying tissues.
 Providing a view of the outside in a windowless room.
 Mutual Telexistence.
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Mutual telexistence
 Working and perceiving with the feeling that you are in
several places at once.
 Real-time video of separated individuals is projected onto
surrogate robotic participants.
 This is done via sophisticated communication technology.
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Diagram of Mutual Telexistence
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Where have you seen Optical
Camouflage in fiction??
James Bond film Die Another Day.
Arnold Schwarzenegger film Predator.
Doom video game series.
Metal gear Solid video game series.
Halo video game series.
In Japanese animation series Ghost in the
shell.
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Future Outlook
 It requires suit covered in tiny cameras and projectors.
 It should be programmed to gather visual data from
different angles and project them in equally large number
of directions.
 It would require a massive amount of computing power
and embedded sensors.
 Sophisticated nanotechnology will be required.
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Drawbacks
 Large amount of external hardware required.
 Only partial invisibility is achieved.
 Target can only be in a certain point of view.
 Observer need to look through a combiner.
 Current system needs half mirror and projector, which are
fixed on the ground.
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Conclusion
 Now all of us have had a small tour of the interesting world
of Optical camouflage.
 Optical Camouflage is a technology which is currently in a
very primitive stage of development and hence have many
drawbacks.
 Research work is going on and soon we will have even
more astonishing results.
 This technology is believed to have a significant role in the
future world. . .
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ANY QUERIES?
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