Class 17, Reading 1

Reading

• GestureWrist and GesturePad: Unobtrusive Wearable Interaction Devices
  
• Rekimoto
  

Outline

• 1. Introduction
  
• 2. Related work
  
• 3. Technological background
  
  • 3.1. Capacitance sensing
    
  • 3.2. On-body networking
    
• 4. GestureWrist A wristband-type input device
  
  • 4.1. Hand-gesture recognition
    
  • 4.2. Forearm movement measurement
    
  • 4.3. Tactile feedback
    
  • 4.4. Combining two sensor inputs
    
• 5. GesturePad: A sensor module for interactive clothing
  
  • 5.1. Sensor configurations
    
  • 5.2. Interaction areas on clothing
    
  • 5.3. Clothes as communication surfaces
    
• 6. Discussion and future research
  
  • 6.1. Combination with output devices
    
  • 6.2. Combination with on-body networks
    
  • 6.3. Sensing other parts of the body
    

Notes

• Introduction
  
  • Important wearable computing feature #1: Supporting hands-free operations or allowing quick changes between normal and operation modes
    
    • Some input devices used with wearable computers need to be held during operation
      
    • With one hand already occupied, performing two-handed tasks becomes difficult
      
    • Glove-type input devices hinder performing real-world tasks
      
  • Important wearable computing feature #2: Social acceptance
    
    • Input devices should be as natural and unnoticeable as possible for use in various social settings
      
    • Many current wearable input devices look unusual or too "hi-tech"
      
      • Often troublesome to wear long-term in everyday situations
        
    • Traditional wearable accessories (e.g., wristwatches, eyeglasses, jewelry, clothes) part of daily life and designed for comfort with long-time use
      
  • "Unobtrusiveness"
    
    • Unobtrusiveness of input devices essential for being used in everyday situations
      
    • One possible way is to embed input sensors to conventional wearable items
      
  • Paper's two example devices:
    
    • GestureWrite
      
      • Wristwatch-type input device that recognizes human hand gestures by capacitively measuring changes in wrist type
        
      • Combined with acceleration sensor mounted to wristband, can be used as command-input device
        
    • GesturePad
      
      • Layer of sensor electrodes transforms conventional clothes into interaction devices (i.e., "interactive clothing")
        
      • Can be attached to area of clothing such as sleeve or lapel
        
      • On capacitive sensing, can detect and read finger motions applied on outside of clothing fabric
        
• Technological background
  
  • Capacitance sensing
    
    • Definition:
      
      • A technique for measuring distances of nearby conductive objects
        
      • Measures the capacitance between the sensor and the object and uses a transmitter and a receiver electrode
        
    • Used for measuring:
      
      • the arm shape by placing both the transmitter and receiver electrodes on a wristband
        
      • finger positions by attaching electrodes on the inside of clothes
        
  • On-body networking
    
    • Based on capacitive sensing, a technique that transmits data through the human body
      
    • Wearable devices can:
      
      • communicate with each other
        
      • automatically authenticate digital devices that are touched
        
    • Technique used to distinguish wearer from other people while interacting with GesturePad
      

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