TITEL DES VORTRAGES

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Enabling Implicit Interaction in Wearable
Applications Dont use sensors only for one
task.
Hendrik Witt University of Bremen Center for
Computing Technologies
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Introduction

• Wearable Computing means
• Support the user during work with IT
• dont disturb him
• provide him useful functions all the time
• Integration of IT into work cloths (e.g. helmet)

Interaction is the key!
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The Context Recognition Problem

• Context recognition can be done best with
  very detailed sensor data
• Many sensors needed
• Special sensor placement and tuning
• Problems
• Additional interaction devices needed
• Loss of unobtrusiveness
• Loss of usability

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Wearable Interaction Devices

• Device characteristics
• Special purpose
• Complex built-in sensors
• Explicit interaction
• Sometimes built-in gesture recognition

Most time devices are idle!
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Our Approach Experiment Setup
Use sensors whenever not used during explicit
interaction

• Machine Learning
• C4.5 Decision-Tree Algorithm (Weka)
• Training-Set
• Standard feature set (mean, variance,
  zero-crossing,)
• Sensor setup
• No special sensor tuning or setup!

• Experiment
• Device Winspect Wireless Data-Glove
• 6 Test-Persons
• 4 right-handers, 2 left-handers
• Recognition of 3 different activities
• Hammering, Screwing, No Activity
• Activities were performed continuously
• No predefined task sequence

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Winspect Wireless Data-Glove

• electronic module including Bluetooth
• accumulator (9V-block)
• RFID-Scanner
• liquid tilt-sensor
• magnet
• 3 Reed-switches (magnetic switches)

• explain scipio

1 2 3 4
5 6
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Principal Motion Analysis
Rotation around different axis (complementary
motions)
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Recognition Results

• Overall Recognition Rate 89,47
• No significant difference in recognition
  results between right- and left-handers
• Results are comparable to others in context
  recognition research

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Conclusion

• Using data-glove sensor for more then one task
  is feasible
• Comparable recognition rates have been achieved
• Reduced amount of sensors is needed
• Usability of applications is positively affected
  
• Unobtrusiveness can be kept due to a minimum set
  of sensors needed
• Problem
• Without sensor tuning or setup, things can
  become tricky!
• Open Question
• How to automatically switch between implicit and
  explicit interaction mode?

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Thank you for your attention!

• Questions?