Optical Camouflage Presented by PRAVIN M R 745
Optical Camouflage Presented by, PRAVIN. M R 745
This is what it really does… - Optical Camouflage - 2
What is Optical Camouflage? ? Ø It is developed by three scientists at the university of Tokyo. Ø Camouflage means to blend with the surroundings. Ø Optical Camouflage is a kind of camouflage in which, one wears a cloth which projects the background so that he appears somehow invisible. Ø It provides invisibility only in the visible portion of the spectrum. - Optical Camouflage - 3
Retro-reflective Material Ø The cloak that enables, optical Camouflage to work is made from a special material known as retro-reflective material. Ø Retro-reflective material is covered with thousands of small beads. Ø When light rays strike any of these beads, they are reflected back exactly in the same direction from which they came. - Optical Camouflage - 4
Light Surface Reflectivity - Optical Camouflage - 5
Retro-reflectivity Ø In retro reflection the glass beads act like prism, bending the light rays by a process known as refraction. Ø An observer situated at the light source receives more of the reflected light and hence a brighter reflection. - Optical Camouflage - 6
Principle of Optical Camouflage Ø Optical camouflage works by taking advantage of something called augmented-reality technology. Ø Augmented reality system’s add computer generated information to a user’s sensory perceptions. Ø Augmented reality system’s are not the same as virtual reality system’s. Ø Augmented reality system’s require that the users view through a special viewing apparatus. - Optical Camouflage - 7
REQUIREMENTS ØA garment made from retro-reflective material. ØA video camera. ØA computer. ØA projector. ØA special half silvered mirror called a combiner. - Optical Camouflage - 8
Combiner: Ø It is also called beam-splitter. Ø It reflects the projected image towards cloak. Ø It lets light rays bouncing of the cloak to the user’s eye. Ø Allows the user to perceive both image enhanced by computer and surrounding light. Ø Both computer generated image and real world scene must be fully integrated. - Optical Camouflage - 9
The Complete System - Optical Camouflage - 10
How does it work? ? Ø The person who wants to be invisible wears the cloak made of retro-reflective material. Ø A digital video camera captures the scene behind the person wearing the cloak. Ø The computer processes the captured image. Ø The projector receives the enhanced image from the computer and shines the image through a pin-hole sized opening onto the combiner. contd. . . 11 - Optical Camouflage -
How does it work? ? Ø The silver half of the mirror which is completely reflective, bounces the projected image towards the person wearing the cloak. Ø The cloak reflects light directly back to the mirror. Ø Light rays bouncing off of the cloak pass through the transparent part of the mirror and falls on the user’s eye. Ø Hence, the person wearing the cloak appears partially invisible. - Optical Camouflage - 12
Real World Applications Ø Pilots landing a plane could use this technology to make the cockpit floors transparent. Ø This enables them to see the runway simply by glancing down. Contd. . . - Optical Camouflage - 13
Real World Applications Ø Drivers backing up cars could benefit from optical camouflage. Ø A quick glance backward through a transparent rear would make it easy to know when to stop. - Optical Camouflage - Contd. . . 14
Real World Applications Ø Doctor performing surgery could see through their hands and instruments to the underlying tissues. Ø Providing a view of the outside in a windowless room. Ø Mutual Telexistence. - Optical Camouflage - 15
Mutual telexistence Ø Working and perceiving with the feeling that you are in several places at once. Ø Real-time video of separated individuals is projected onto surrogate robotic participants. Ø This is done via sophisticated communication technology. - Optical Camouflage - 16
Diagram of Mutual Telexistence - Optical Camouflage - 17
Where have you seen Optical Camouflage in fiction? ? Ø James Bond film Die Another Day. Ø Arnold Schwarzenegger film Predator. Ø Doom video game series. Ø Metal gear Solid video game series. Ø Halo video game series. Ø In Japanese animation series Ghost in the shell. - Optical Camouflage - 18
Future Outlook Ø It requires suit covered in tiny cameras and projectors. Ø It should be programmed to gather visual data from different angles and project them in equally large number of directions. Ø It would require a massive amount of computing power and embedded sensors. Ø Sophisticated nanotechnology will be required. - Optical Camouflage - 19
Drawbacks Ø Large amount of external hardware required. Ø Only partial invisibility is achieved. Ø Target can only be in a certain point of view. Ø Observer need to look through a combiner. Ø Current system needs half mirror and projector, which are fixed on the ground. - Optical Camouflage - 20
Conclusion Ø Now all of us have had a small tour of the interesting world of Optical camouflage. Ø Optical Camouflage is a technology which is currently in a very primitive stage of development and hence have many drawbacks. Ø Research work is going on and soon we will have even more astonishing results. Ø This technology is believed to have a significant role in the future world. . . - Optical Camouflage - 21
T K N HA . . . OU Y - Optical Camouflage - 22
ANY QUERIES? - Optical Camouflage - 23
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