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DarshanVithani
ME CSE Department,
Parul Institute Of Engineering and Technology
4 October 2013
Optical Multi-touch Technology

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Multi-touch Table

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Contents
Introduction to Multi–Touch Technology
Description of MT Devices
Various Sub System
H/W & S/W Required
Usage of Multi-Touch devices

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Introduction
Multi-touch technology is
an advanced human-
computer interaction
technique that recogonises
multiple touch points and
also includes the hardware
devices for implement it

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Description
The multi-touch device is a user interface
device that will allow a user to interact
with a computer through use of a multi-
touch display.
it is a substitute to the keyboard and
mouse
In this user can directly interact with the
system with their fingers and not only
this but with multiple touches at the
same instant.

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How Does a Touchscreen Work?
A basic touch-screen has
three main components:
Touch sensor;
Controller;
Software driver.
The touch-screen is an
input device, so it needs to
be combined with a display
and a PC or other device to
make a complete touch
input system.

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Touchscreen Technology
Resistive Capacitive Optical

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TERMINOLOGY
 Diffuser: Screen surface for projection.
 IR Lasers: Laser emitting IR Beam.
 IR Led: Led emitting IR.
 Blob - A bright luminescent object
 Blob tracking - Assigning each blob an ID (identifier).
 TUIO - A protocol used for communicating the position, size, and
relative velocity of blobs. (Tangible User Interface Object)
 CCV: An open source software for blob tracking. (Community Core
Vision)
 MT: Multitouch

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 FTIR :Frustrated Total Internal Reflection
 DI: Diffused Illumination
 DSI: Diffused Surface Illumination
 LED LP: Led Laser Plane
 LLP: Laser Light Plane
TECHNIQUES

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FTIR :Frustrated Total Internal Reflection

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Diffused Illumination

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Diffused Surface Illumination

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LED LP

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IR LASER PLANE

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BLOCK DIAGRAM OF TABLE

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BLOCK DIAGRAM OF WALL

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Implementation on Wall

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Camera Sensor & IR Bandpass Filter

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Input Subsystem: The Camera
 We can use a simple
web camera that can
be easily available in
the market.
 It can be made
capable of detecting
IR by simply removing
the filter from the
lens

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Output Subsystem: Projector
 We can use a simple web camera that can be
easily available in the market.
 It can be made capable of detecting IR by simply
removing the filter from the lens

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Computer Subsystem
 A personal computer with 20 GB
free hard disk space, 1GB RAM and
PIV + processor can be efficient
enough.
 The Windows XP/7/8 operating
system was chosen because the CCV
package is highly supported in
Windows.
 It is also support Mac OS ,linux
Debian , Ubuntu & Fedora etc

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Application Development
 Adobe Flash / Flex / Air
 Browser & Web (HTML/CSS/Javascript)
 C/C++ (CCV/OpenCV/OpenGL/OpenFrameworks)
 Java (Android/Processing.org)
 C# (.NET/Silverlight/WPF)
 Objective-C (Cocoa/iPhone)

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APPLICATIONS
 Personal Computing
 Advertising
 Graphics
 Audio Mixing
 Video Playing
 Computer Gaming
 Slide Presentations
……and many more!

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CONCLUSION
 Multi-touch technologies have a long history. Mostly multi Touch devices
have limited resolution, are relatively complex, and don't easily and
inexpensively scale up to large dimensions.
 Optical Multi-touch technology use FTIR technique that is simple and easy
to implement . It provides any resolution displays supported with high
graphics.
 In this research , it requires a significant amount of space behind the
interaction surface. Instead of this we can use Raspberry Pi & its
introduction covered by Pranav Pathak.

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REFERENCES
[1] Low-Cost Multi-Touch Sensing through FTIR by Jefferson Y. Han
[2] Buxton, W., Hill, R., and Rowley, P. 1985. Issues and Techniques in
[3] Touch-Sensitive Tablet Input
[4] Donald Hearn ,M Pauline Baker, Computer Graphics C version, 2/E
[5] Pearson Education ,2003
[6] Buxton, Bill. 2008. Multi-Touch Systems that I Have Known and Loved.
[7] URL: http://www.billbuxton.com/multitouchOverview.html
[8] How to build a multi touch by Harry Vaan Der
[9] Opensource,MultitouchDisplay,http://www.technologyreview.com/Infotec
[10] OpenCV on the Raspberry Pi
, http://www.raspberrypi.org/phpBB3/viewtopic.php?f=37&t=6354

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Thank You
Darshan Vithani, 4 October 2013