A ppt on Virtual Keyboard which increases human - computer interactions using laser technology and image processing

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