This document summarizes optical camouflage technology. Optical camouflage uses a video camera, computer, projector, and special reflective material to render the wearer invisible. It works by capturing the background scene with a camera, projecting that image onto the reflective garment with a projector, allowing observers to see through the wearer. The garment relies on retroreflective materials that bounce light directly back to its source, reflecting only the projected image and not the wearer. Potential applications include augmented reality surgery, stealth technology, and mutual telepresence.

1. OPTICAL
CAMOUFLAGE
SEMINAR
B.SAI VENKAT
19261A1211
Mentor:
Mrs. N. SREE DIVYA

2. CONTENTS:
 INTRODUCTION
 COMPONENTS REQUIRED
 WORKING
 RETROREFLECTIVITY
 HOW RECTRO REFLECTIVITY WORKS
 APPLICATIONS
 REFERENCES
 CONCLUSION

3. INTRODUCTION:
 Optical camouflage is a kind of active camouflage which
completely envelopes the wearer.
 It displays an image of the scene on the side opposite the viewer
on it, so that the viewer can "see through" the wearer, rendering
the wearer invisible.
 Optical camouflage doesn't work by way of magic. It works by
taking advantage of something called Augmented-reality
technology.

4. COMPONENTS REQUIRED:
It is consists of:
 a garment made from
highly reflective
material
 a digital video camera
 a computer
 a projector
 a special, half-silvered
mirror called a
combiner.

5. For using optical camouflage, the following
steps are to be followed –
 The person who wants to be invisible (let's
call her Person A) dons a garment
The garment is made of a special material
that we’ll examine more closely in a moment.
 An observer (Person B) stands before
Person
A at a specific location. At that
Location, instead of seeing Person A wearing
a hooded raincoat, Person B sees right
through the cloak, making Person A appears
to be invisible

6. WORKING:
First, putting the video camera
behind the person in the cloak,
and capturing his background.
Then, projecting the captured
image onto the cloak from the
projector.
Because the image is projected
by the technology called Retro-
reflective Projection Technology
(RPT), you can see the reflection
only on the cloak and clearly
even in brightness.

7. RETROREFLECTIVITY:
 A retro-reflective material is covered with thousands of small beads.
When light strikes one of these beads, the light rays bounce back
exactly in the same direction from which they came.
 A retro reflector is a device that sends light or other radiation back
where it came from regardless of the angle of incidence, unlike a
mirror, which does that only if the mirror is exactly perpendicular to
the light beam.

8. Retroreflective effect can be obtained in
two ways:
1. With reflecting and refracting optical elements
arranged so that the focal surface of the refractive
element coincides with the reflective surface,
typically a transparent sphere and a spherical
mirror
 This is conventionally known as a cat's eye
retro reflector.
2. With a set of three mutually perpendicular
mirrors which form a corner (a corner reflector
or corner cube)

9. REAL WORLD APPLICATIONS:
 AUGMENTED STEREOSCOPIC VISION IN SURGERY
 COCKPIT FLOORS
 TRANSPARENT REAR HATCH
 WINDOWLESS ROOMS
 STEALTH TECHNOLOGY
 MUTUAL TELEXISTENCE

10. CONCLUSION:
 There have been a lot of innovations in the present world which
seems to be evolved like a volcanic eruption of technology. Even
then Human beings are unable to unlock the mystery of universe
.By this type of innovating technology from the further corners of
the world where the dark arts still hold sway the people are being
trying to bent the laws of nature .This is the technology of that
type .

11. REFERENCES:
 http://www.star.t.u-tokyo.ac.jp
 http://en.wikipedia.org/wiki/Cloaking_device
 http://en.wikipedia.org/wiki/Active_camouflage
 http://www.gatetopics.com/
 http://www.seminarslide.com
 http://www.seminarstopics.com
 http://projectstopics.com/