optical multi touch technology

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Darshan VithaniME 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 TechnologyDescription of MT DevicesVarious Sub SystemH/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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DescriptionThe 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 YouDarshan Vithani, 4 October 2013