Submitted byLESLEY.SReg. No.SBAG10183781

WELCOMEMULTI TOUCH

• 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.

• INTRODUCTION(TOUCH SCREEN)

• 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 .

• INTRODUCTION…..

• 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…

In 2007 Microsoft introduced Microsoft Surface.

Intel Core 2 Duo processor, Windows Vista, and 2 GB of RAM.

Features of….

Transf

erring

music

between

Ipods

Photo

Sharing a

nd

multi

media

Perceptive Pixel

• 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.

Apple

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.

MacBook Pro

iPhone Touch

iPod touch

MacBook Air

Products of Apple……

WORKING

IR rays obtained on a camera

F T I R FRUSTRATED TOTAL INTERNAL REFLECTION

• 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.

Total Internal Reflection

(a) IR view of a touch(b)Pixel positions located on screen

Frustrated Total Internal Reflection

Acrylic with led’s at its edges

HARDWARE

IR led’s Acrylic Camera Projector Computer

SOFTWARE

Processing (P5) Flash C C++ Java

ADVANTAGES

• Low cost factor.• Support high-resolution graphics.• Larger shared-display systems.• It acquires true touch image

information at high spatial and temporal resolutions.

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.

CONCLUSION

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

QUESTIONS

THANK YOU