Augmented reality (AR) is a live, direct or indirect, view of a physical, real-world environment whose elements are augmented by computer-generated sensory input such as sound, video, graphics or GPS data. It is related to a more general concept called mediated reality

1. Augmented
Reality (AR)
Chirag Thakkar (MCA-1ST SEM-41)

2. INDEX
• WHAT IS AUGMENTED REALITY?
• AUGMENTED REALITY VS. VIRTUAL REALITY
• MILGRAM’S REALITY-VIRTUALITY CONTINUUM
• COMBINING THE REAL AND VIRTUAL WORLDS
• REALISTIC MERGING
• FAILURES IN REGISTRATION
• DISPLAY TECHNOLOGIES
• USES OF AUGMENTED REALITY

3. WHAT IS AUGMENTED REALITY?
• A combination of a real scene viewed by a
user and a virtual scene generated by a
computer that augments the scene with
additional information.
• ARToolkit demo movie
• T-immersion 2004 video

4. J.A.R.V.I.S. CONCEPT OF AR

5. AUGMENTED REALITY VS.
VIRTUAL REALITY
Augmented Reality
• System augments the
real world scene
• User maintains a sense
of presence in real world
• Needs a mechanism to
combine virtual and real
worlds
• Hard to register real and
virtual
Virtual Reality
• Totally immersive
environment
• Senses are under control
of system
• Need a mechanism to
feed virtual world to
user
• Hard to make VR world
interesting

6. MILGRAM’S REALITY-VIRTUALITY
CONTINUUM
Mixed Reality (MR)
Real
Environment
Virtual
Environment
Augmented
Reality (AR)
Augmented
Virtuality (AV)
Milgram coined the term “Augmented Virtuality ” to
identify systems which are mostly synthetic with some real
world imagery added such as texture mapping video onto
virtual objects.

7. COMBINING THE REAL AND
VIRTUAL WORLDS
We need:
• Precise models
• Locations and optical properties of the viewer (or camera)
and the display
• Calibration of all devices
• To combine all local coordinate systems centered on the
devices and the objects in the scene in a global coordinate
system

8. Con..
• Register models of all 3D objects of interest with their
counterparts in the scene
• Track the objects over time when the user moves and
interacts with the scene

9. REALISTIC MERGING
Requires:
• Objects to behave in physically plausible manners
when manipulated
• Occlusion
• Collision detection
• Shadows

10. FAILURES IN REGISTRATION
Failures in registration due to:
• Noise
• Position and pose of camera with respect to the real
scene
• Image distortions
• Time delays
• In calculating the camera position

11. DISPLAY TECHNOLOGIES
• Monitor Based
• Laptops
• Cell phones
• Projectors (more Ubiquitous Computing)
• Head Mounted Displays:
• Video see-through
• Optical see-through

12. MONITOR BASED AUGMENTED
REALITY
• Simplest available
• Treat laptop/PDA/cell phone as a window through
which you can see AR world.
• Sunglasses demo

13. MONITOR BASED AR
• Successful commercialization
• Yellow line in football broadcasts
• Glowing hockey puck
• Baseball cards
• Ad campaigns

14. OPTICAL SEE-THROUGH HMD

15. VIDEO SEE-THROUGH HMD

16. USES OF AUGMENTED REALITY
•Interactive in real-time
•Real time processing
•Data can be generated in real time

17. Con..
•Registered in three dimensions
•Imagery is in 3D
•Graphics and Models are created by
Designers

18. Con..
• Video Games
• Physical interactions with 3D models
• Presentations
• Can now be more interactive
• Television
• You will be able to watch TV in 3D any where
• Theme Park
• Rides can now be even more realistic
• Simulations
• Driving, Flying, Etc…

19. THANK YOU