PRESENTED BY-

S.PRAVEEN(08H61A04B3)

TECHNICAL SEMINAR REPORT

CONTENTS

Introduction Functionality Results Advantages Disadvantages Applications Conclusion

INTRODUCTION Devices with small size have some limitations Since we can’t make buttons and screens larger

without losing the benefit of small size. The main reason for appropriating the human

body as an input device are:

(i) roughly we have two meter external square surface area

(ii) easily accessible by hands

INTRODUCTION (contd…) Skinput turns our body into touch screen

interface (on body projection and on body sensing)

Thus we can use our own skin as input canvas

This technology uses the screen as the tracking surface or the unique input device

FUNCTIONALITY Giving input through skin Was developed by Chris Harrison

(Carnegie Mellon University), Desney Tan and Dan Morris, Microsoft.

Skinput turns the body into a touch screen interface

TECHNOLOGY USED Skinput, the system is a combination of two

technologies: the ability to detect the ultra low frequency sound and the “Pico” projectors

Tiny pico projector applies the use of projector in a handheld device.

An acoustic detector detects the ultra low frequency

HOW IT WORKS It uses a microchip-sized Pico

projector to display menu It is known as pocket projector or

mobile projector An acoustic detector to detect sound

vibration

BIO ACOUSTICS: SENSING These signals need to be sensed or worked

upon. Various sensors like conventional

microphones, accelerometers, piezo contact microphones are present.

Bone conduction microphones are better. Array of tuned vibration sensors are

present (cantilevered piezo films).

SENSING: ARM BAND This done by wearing the wave sensor

armband.

PROCESSING An audio interface is captured from sensors

and is converted to digital signal form. This is connected to the a pc via Bluetooth. A software to match sound frequencies to

specific skin locations is used. Calculations are made and appropriate tap

positions are located and corresponding action is implemented.

EXPERIMENTS Experiments were conducted taking several

locations on the arm and with different number.

Example:

Fore arm

Whole arm, etc.

RESULTS It was observed that the efficiency was

highest when fore arm (below the elbow) was considered.(95.5%)

Various efficiency values were observed and noted down.

The results also depended on other factors like BMI, etc.

PROJECTION ON THE ARM

ADVANTAGES No need to interact with the gadget directly Don’t have to worry about keypad People with larger fingers get trouble in

navigating tiny buttons on keyboards and mobile phones. With skinput that problem disappears.

DISADVANTAGES

1.Many people would not wear a very big band around their arm for the day just to have this product.

2.Individuals with visible disabilities such as amputated arms or the blind cannot use this product.

3.Skinput while driving is dangerous.

APPLICATIONS Mobile Gaming i-pods Music players

CONCLUSION The approach to appropriating the human

body as an input surface is presented . A novel variable bio acoustic used to detect

and localize finger taps on the hand and the forearm is designed.

This system performs very well if the body is in motion.