MULTI TOUCH A SEMINAR REPORT

[seminar class]

presented by S. BALA BRAHMAM

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Introduction
WHAT IS TOUCH-SCREEN?
 A touch-screen is a display which can detect the presence and location of a touch within the display area. The term generally refers to touch or contact to the display of the device by a finger or hand.
 Types of Touch-screen Technologies
 Resistive
 Surface acoustic wave
 Capacitive
 Infrared
 Optical imaging
 Dispersive signal technology
WHAT IS MULTI TOUCH?
 Multi-touch is a human-computer interaction technique and the hardware devices that implement it, which allow users to compute without conventional input devices e.g., mouse, keyboard.
HISTORY
 Multi-touch technology dates back to 1982, when the University of Toronto developed the first finger pressure multi-touch display.
 Bell Labs: In 1984 Bell Labs engineered a multi-touch screen that could manipulate images with more than one hand.
 Fingerworks: In 1998, FW, a Newyork-based company run by University of Delaware academics John Elias and Wayne Westerman, produced a line of multi-touch products including the iGesture Pad and the TouchStream keyboard.
 RECENT DEVELOPMENTS
 Microsoft Surface
 Perceptive Pixel
 Apple iPhone, iPod touch, MacBook Air, and MacBook Pro
 FUTURE
 Enhanced dining experience
 Concierge service
 Governmental use
 Concept mapping
 Collaboration and instruction on Interactive Whiteboards
 PRINCIPLE
FRUSTRATED TOTAL INTERNAL REFLECTION
Total internal reflection
The critical angle is given by
 Total Internal Reflection
 Design (Requirements)
HARDWARE REQUIREMENTS
Acrylic with LEDs at its edges
Software requirements
Programming languages like
Processing (P5), Flash, C, C++, Java, etc.
IR rays obtained on a camera
Working
Frustrated Total Internal Reflection
(a)IR view of a touch
(b)Pixel positions located on screen
Advantages
 Multi touch based on FTIR is a simple and inexpensive technique
 Scalable technique
 True touch image information
 scalable to large installations
 Larger shared-display systems
Applications
 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.
 Government offices and business purposes.
 An enhanced multimedia experience including audio,video and photo sharing.
 Enhanced dining experience Applications for a multi touch display are never ending . We can even convert computer to a mere piece of display attached to a wall or a table.
Conclusion
 Multi touch provides any resolution displays supported with high graphics. The applications being both made and proposed are plenty in number.