This document discusses Skinput technology, which uses a person's arm as a touchscreen interface. It works by using a small projector to display a menu on the arm and an acoustic detector to sense sound vibrations from taps on the arm. The technology detects both longitudinal and transverse waves created from taps. It has applications for mobile devices, gaming, and accessibility. Skinput provides a touch-free way to interact with technology and could open new possibilities for interacting with devices.

2. SVCN ENGINEERING COLLEGE
(Affiliated to JNTU & Approved by A.I.C.T.E New Delhi
Nellore-524 001 Andhra Pradesh, India
SKINPUT TECHNOLOGY
THE HUMAN ARM AS TOUCH SCREEN
Chakrinithesh.y

3. EVOLUTION OF TOUCHSCREEN:-
Motion
tracking
is the principle
used in touch-
screen

4. Introduction to SKINPUT :-
 Skinput turns our
body into touch
screen interface.
 Thus we can use
our own skin as input
canvas.
 This technology
uses the screen as
the tracking surface
or the unique input
device

5. What is Skinput:-
 Giving input
through skin.
 It was developed
by Chris Harrison (
Carnegie Mellon
University),
Microsoft Research.
 Skinput turns
skin into a touch
screen interface.

6. Touch Screen vs. Skinput Technology

7.  It listens to the
vibrations in the
body.
 Skinput also
responds to
various hand
gestures.
 The arm itself is
an instrument.
Principle of Skinput:-

8. HOW MAKE IT WORKS
• It needs Bluetooth connection.
• It uses a microchip-sized Pico
projector to display menu.
• An acoustic detector to detect
sound vibrations.

9. Technology Used:-
Skinput, the system is a combination of two
technologies: the ability to detect the ultra low
frequency sound and the ‘pico’ projectors
Pico projector applies the use of projector in a
hand held device.
An acoustic detector detects the ultra low
frequency.

10. Pico Projector
 It is also known as pocket projector or mobile
projector.
 The system comprises three main parts:
 The Laser light source
 The Combiner optics
 The Scanning mirror

11. Bio-Acoustics
Study of sound waves inside living body.
When a finger taps the skin, several distinct forms of
acoustic energy are produced.
Longitudinal Waves
Transverse Waves

12. Longitudinal Waves:
These waves travel through the rigid
tissues of the arm, exciting the waves, which
can respond to the mechanical vibrations by
tapping on a rigid body.
TransverseWaves:
Tapping on soft regions of the arm creates
higher amplitude transverse waves.

14. Bio-Acoustics: Sensing
These signals need to be sensed and worked upon.
This is done by wearing the wave sensor arm band.

17. Percent Accuracy

18. 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 and keypads on
mobile phones. With skinput this problem
disappears.

19. Applications
Mobile
Gaming
I-pods
An aid to paralyzed persons.

20. USING FINGERS AS CONTROL
PAD OF GAME
Through Skinput we can play games with just the
movement of our hands. This will introduce a totally new
era of gaming.

21. Making a Phone Call Using
Skinput
We can turn our arm into a cellphone It will be possible to
make calls by just typing numbers that flash on your
forearm[6]. All other functions can also be performed using
Skinput. We can also increase or decrease the volume
change the track of our music players like the i-pod without
actually touching the gadget.

22. Future Implications
With small sized Pico-projectors, Skinput
oriented systems, are an emerging trend.
Research is carried out for smaller wrist watch
sized sensor arm band.

23. Conclusion
This approach is to appropriate the human body as an
input interface.
It described a wearable bio-acoustic array used to
detect and localize finger tap on the hand and the
forearm.
This system performs well even when the body is in
motion.