The document discusses augmented reality (AR) and its differences from virtual reality, defining AR as the combination of real scenes with computer-generated data. It outlines types of AR, including marker-based, markerless, and position-based methods, detailing the steps and technologies used in each. Additionally, it highlights the tools required to create AR and mentions popular AR applications like Nokia City Lens.

1. Augmented reality
Dept. of Electronics and Instrumentation Engineering
Govt. College ofTechnology, Coimbatore

2. Augmented Reality is BasicallyTerminatorVision

3. Real scene
+
computer generated data (or) graphics
=
Augmented Reality

4. On the other handVirtual reality provides full immersion. It does not “augment” reality.

5. Augmented reality onTV

6. Types of augmented reality
1.Marker-based Augmented reality

7. 2.Markerless Augmented Reality.

8. 3.Position based Augmented Reality

9. Things needed to create Augmented reality:
1. Smartphone
2. Augmented Reality app

10. Marker based Augmented Reality
• Requires a special Marker
• Used in Advertising

11. 1.Input 2. Marker Detection
Steps involved in marker based augmented reality
Using algorithms like Four corner test,
Size test
ThroughVideo

12. 3. Marker Identification and Rendering
Steps involved in marker based augmented reality
• The detected marker is identified by
matching it with other markers in a database.
• UsingTransformation Matrix 3D objects are aligned perfectly on the marker

13. Marker less Augmented Reality

14. Steps involved in marker less augmented reality
1.Feature point detection 2.Plane extraction
SLAM – Simultaneous
Localization and Mapping
Harris Corner Detector

15. 3.Tracking and Rendering
• the distance and orientation of the extracted
plane with respect to the camera is calculated
using various algorithms.(Eg: SIFT).This is called
Tracking.
• The 3D object is rendered on the plane using
rendering software.

16. Marker less AR can be used for Interactive learning

17. Position based augmented reality
Provides real time information

18. Steps Involved:
• Position of the user is found usingGPS
• Information about position is gathered from the internet
• Gathered information is rendered on the screen using suitable rendering software

19. Most popular augmented reality apps
Nokia City Lens