multi touch using touch interface

1. LESLEY.S
Reg. No.SBAG10183781
MULTI TOUCH

2. • A touch screen is a display
which can detect the presence
and location of a touch
within the display area.
• One point of contact at a
time.

3. • Multi-touch technology is an advanced
human-computer interaction technique
that recognises multiple touch points and
also includes the hardware devices that
implement it.
• which allow users to compute without
conventional input devices .

4. • Multi-touch technology dates back to 1982, when
the University of Toronto developed the first
finger pressure multi-touch.
• In 1984 Bell Labs engineered a multi-touch
screen that could manipulate images with more
than one hand.
• In1991 Wellner published a paper on his multi-
touch “Digital Desk”, which supported multi-
finger and pinching motions.
History of Multi Touch…

5. In 2007 Microsoft introduced
Microsoft Surface.
Intel Core 2 Duo processor,
Windows Vista, and 2 GB of RAM.

7. • PP is a company founded by New York
University consulting research
scientist Jefferson Y. Han that creates
wall displays and tables.
• It can accommodate up to 20 fingers.

8. In 2007 they introduced the iPhone, marking
the first time multi-touch technology was used on
a phone.
Later on this technology was introduced in iPod
touch, MacBook Air, and MacBook Pro.

9. MacBook Pro
iPhone Touch
iPod touch
MacBook Air

10. IR rays obtained on a camera

11. F T I R
F R U S T R A T E D T O T A L I N T E R N A L
R E F L E C T I O N
• Total internal reflection is an optical phenomenon that occurs when a ray
of light strikes a medium boundary at an angle larger than the critical
angle with respect to the normal to the surface.
• The critical angle is the angle of incidence above which total internal
reflection occurs.
• The critical angle is given by:
n2= Refractive index of the less dense medium.
n1= Refractive index of the denser medium.

12. Total Internal Reflection

13. (a) IR view of a touch(b)Pixel positions located on screen
Frustrated Total Internal Reflection

14. Acrylic with led’s at its edges

15. IR led’s Acrylic Camera Projector Computer

16. Processing
(P5)
Flash C C++ Java

17. ADVANTAGES
• Low cost factor.
• Support high-resolution graphics.
• Larger shared-display systems.
• It acquires true touch image
information at high spatial and
temporal resolutions.

18. APPLICATION
• Personal computers, Laptops ,Tabletops ,
Graphics Tablets .
• It supports both LCD and CRT monitors .
• Telephones ,Watches ,PDAs, Mobile phones.
• Advanced multi touch Gaming with high graphics
support.
• Governmental, office and business purposes.

19. • Multi-touch technology is an advanced human-computer
interaction technique, which allow users to compute without
conventional input devices .

21. THANK
YOU