optical camouflage(final)

7/31/2019 Optical Camouflage(Final)

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(06CE 57)

Guided by: Nishi Shah

Optical Camouflage


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THIS IS WHAT IT IS REALLY


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WHAT IS OPTICAL CAMOUFLAGE?

Optical camouflage is a

hypothetical type of activecamouflage currently only in avery primitive stage of

development.

The idea is relativelystraightforward: to create the

illusion of invisibility by coveringan object with something thatprojects the scene directly

behind that object .


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HISTORY OF OPTICALCAMOUFLAGE

In 2003, threeprofessors atUniversity of Tokyo

Susumu Tachi,Masahiko Inami andNaoki Kawakamicreated a prototypicalcamouflage system inwhich a video camera

takes a shot of thebackground anddisplays it on a clothusing an externalprojector.


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OPERATION


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WHAT DO WE NEED TO OBTAIN

OPTICAL CAMOUFLAGE? A garment madeof retro-reflective

material A digital video camera

A computer

A projector A special, half-silvered

mirror called a

combiner


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INVISIBILITY CLOAK

The cloak that enables optical camouflageto work is made from a special materialknown as retro-reflective material.

A retro-reflective material is covered withthousands and thousands of small beads.

When light strikes one of these beads, thelight rays bounce back exactly in the samedirection from which they came.


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Video Camera

Capturing backgroundimage requires a videocamera, which sits

behind the personwearing the cloak. Thevideo from the cameramust be in a digitalformat so it can besent to a computer forprocessing.


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Computer

The computertakes the captured imagefrom the video camera, calculate theappropriate perspective to simulate realityand transform the captured image into the

image that will be projected onto theretro-reflective material.


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The projector shinesa light beam through

an opening controlledby a device called aniris diaphragm

The combiner (specialmirror) is used to bothreflect the projected image

toward the cloak and letlight rays bouncing off thecloak to return to theviewers eye


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The Complete System


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MUTUAL TELEXISTENCE


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HOW MUTUAL TELEXISTENCEWORKS

Human user A is at one location while her telexistencerobot A is at another location with human user B.

Human user B is at one location while his telexistencerobot B is at another location with human user A.

Both telexistence robots are covered in retro-reflectivematerial so that they act like screens. With video cameras and projectors at each location,

the images of the two human users are projected ontotheir respective robots in the remote locations.

This gives each human the perception that he isworking with another human instead of a robot.

Right now, mutual telexistence is science fiction, but itwon't be for long as scientists continue to push theboundaries of the technology.


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Real-World Applications

Doctors performingsurgery could useoptical camouflage

to see throughtheir hands andinstruments to the

underlying tissue


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Pilots landing aplane could usethis technology tomake cockpitfloors transparent.

This would enablethem to see therunway and the

landing gear simplyby glancing down.


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Drivers backing up cars could benefitone day from optical camouflage. A quick

glance backward through a transparentrear hatch or tailgate would make iteasy to know when to stop.


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RECOGNITION OF OPTICAL

CAMOUFLAGE In 2003, Time magazine named it the

coolest inventionof 2003.

Invisibility Cloak Named Oneof Science's Top Ten "Breakthroughs"

of 2006


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ADVANTAGES ANDDISADVANTAGES

ADVANTAGES Optical Camouflage

can be used onsurgical globes or

equipments so theydont block surgeonsview during delicateoperations.

In aviation, cockpitfloors could become'invisible' to assistpilots duringlanding.

DISADVANTAGE The weak point of this

technique is that theobserver needs to

look through a half-mirror. The currentsystem needs a half-mirror and projectors,

which were fixed onthe ground.


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CONCLUSION Hence mans impossible wish to be

invisible have become now probableafter Optical Camouflage research.

There are benefits in the fields of

medicine, aviation, automotive,homeimprovement and more as thetechnology is advancing.

But the future promises us a lot more.Research work is going on and soon wewill have even more astonishing results.


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Sources & References

http://science.howstuffworks.com/invisibility-cloak.htm

http://projects.star.t.u-tokyo.ac.jp/projects/MEDIA/xv/oc.html

www.wikipedia.org

www.census.gov

www.youtube.com


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Optical Camouflage Video

optical camouflage(final)

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