The document discusses a seminar on virtual keyboards, detailing their functionality and components such as sensor modules, IR light sources, and pattern projectors. It outlines the operational flow of the virtual keyboard system, emphasizing its advantages like portability and low maintenance, while also noting disadvantages like high cost and visibility issues. The conclusion highlights the practicality of virtual keyboards as a replacement for traditional keyboards, enhancing typing convenience and speed.

1. Virtual Keyboard
A HUMAN-COMPUTER INTERACTION WITH DEVICE, BASED
ON LASER AND IMAGE PROCESSING
Seminar By
R. Teja
1210312248
4/4 B. Tech, B2

2. About Virtual Keyboard
 What is Virtual Keyboard
 Why is Virtual Keyboard
 Modules in Virtual Keyboard
 How it works in general

3. 1) Sensor Module
 CMOS (complementary metal-
oxide semiconductor) image sensor
is generally used here
 Why is Sensor Module
 Image Processing

4. 2) IR Light Source
 To eliminate visible light
 CMOS image sensor captures
this IR light
 Image Processing

5. 3) Pattern Projector
 To project laser light for
keyboard
 Generally QWERTY is used
 How Laser is produced

6. Virtual Keyboard System Architecture

7. Flow Chart for
Virtual Keyboard
 1) Start
 2) Initialize coordinates
 3) Image of size x*y at z fps is
taken

8. 4) Image Thresholding
 Replace each pixel with black
if intensity is less than some
fixed constant
 Else replace with white pixel

9. 5) Ellipse Fitting
 Finding of ellipse center
coordinates where user pressed
his/her finger
 ‘T’ is ellipse center in
following picture

10. Flowchart
 6) Ellipse center coordinates is
mapped to character
 7) Output corresponding to
that character is sent to device
 8) Again Start(i.e.; go to step
1) if still using
 Else Stop

11. System information Flowchart

12. Advantages
 Portability
Can be used in less or no light areas
 Flexibility
 Speed
 Less noise
 Less force is enough
 Water proof
 Low maintenance
 High security
 No driver software necessary (plug-and-use)

13. Disadvantages
 High cost
 Visible light may distract laser light
 Hard to use for beginners
 Flat surface necessary

14. Conclusion
 Convenience and compactness
 Basic for 6th sense technology devices
 Makes typing easier and faster
 Experimental results shows that these keyboards can be used for practical
purpose and can replace traditional keyboards

15. Thank You