Skinput is a bio-acoustic sensing technique that allows the body to be used as an input surface. Finger taps on the skin create acoustic waves that are detected by sensors in an armband. The armband classifies the finger taps by location on the arm, allowing the arm to control a device in real time. Research is ongoing to make the armband smaller and extend its capabilities to more devices while maintaining high accuracy. The technique was presented at the CHI 2010 conference and allows for intuitive control of devices through natural gestures on the skin.

1. Invented By
Presented By
Md. Shihab Uddin
Roll : 0607029
CSE,KUET

2. Outline
• Overview
• User Research
• Future
• References

3. Overview : Skinput
Overview
Skinput is a Bio-acoustic Sensing Technique that allows the body to
be used as an Input Surface.

4. Overview : Skinput Continued
Finger Taps on Skin Creates Several Forms of Acoustic Energy

5. Overview : Skinput Continued
Transverse Wave Propagation:
Finger Impacts Displace The Skin Creating Transverse Waves

6. Overview : Skinput Continued
Longitudinal Wave Propagation:
Finger Impacts Create longitudinal(Compressive) waves that
cause internal structures to vibrate. This in turn Creates
longitudinal Wave Forms outwards from the bone towards
skin.

7. Overview : Skinput Continued
Outside View Inside View
A Wearable Bio-acoustic Sensing Array Built into an Armband. Sensing
Elements detect vibrations transmitted through the body. The two
sensor packages shown above each contain five specially weighted
cantilevered piezo films responsive to a particular frequency range.

8. Overview : Skinput Continued
Finger Taps on Arm Generated Signals
Variation in Bone Density, Size & Mass as well as filtering
effects from Soft Tissues & Joints Mean Different Locations
that are acoustically distinct.

9. Overview : Skinput Continued
Recognizing Input Locations Finalizing Input Points
Designed Software Listens for impacts & Classifies them. Then
Different Interactive Capabilities are bounded on different
regions.

10. User Research: Skinput
Playing Tetris: Using Fingers Active also in Movable
as Control Pad Environment
Using Fingers,Palms,Arms as Control Any Computing Device Can
be run.Response is real time,robust & remains functional while
walking & Accuracy level is 99.5%()

11. User Research: Skinput
Using a Pico Projector On the Armband Skinput can also be used as an
Output Surface
Using A mobile Phone by Skinput

12. User Research: Skinput
Projection of a Dynamic Finger Inputs are Classified &
Graphical Interface processed in Real Time

13. Future: Skinput
• Extensive Research is going on Currently on
Skinput to
 make the armband more smaller.
Incorporate More Devices with This System.
Extend accuracy level.

14. References : Skinput
• http://research.microsoft.com/en-
us/um/redmond/groups/cue/skinput Official
Home Page of Skinput.
• http://www.chi2010.org Home Page of Computer
& Human Interactions Conference, April,2010.
• http://www.chrisharrison.net/projects/skinput
Personal Homepage of Chris Harrison.
• http://research.microsoft.com/en-
us/um/people/dan Homepage of Dan Morris.
• http://research.microsoft.com/en-
us/um/people/desney Homepage of Desney Tan.
This paper was Presented at Computer & Human Interactions Conference(CHI-
2010) at April,2010, Atlanta,USA & Published by ACM.