2 d barcodes(NSM)
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Transcript

  • 1. Pervasive 2D Barcodes for Camera Phone Applications
  • 2. History
    • 2000
      • CyberCode1, Sony, visual tagging augmented reality
      • J-SH09, J-Phone - QR Code: 1-D and 2-D phone
    • QR Code Blog
    • URLS
    • Email addresses
    • Shopping
    • Public Transport Schedules and Events
    • Air Line Ticketing
    • Coke Promotions
    • Food-history information service
  • 3. Motivation: How well do they work?
    • Omnidirectional symbol reading
    • Support for low-resolution cameras
    • Reading robustness under different lighting conditions
    • Barcode reading distance
    • Error correction capability
    • Security
    • Support for multiple character sets
    • Data capacity
  • 4. Study
    • 30 2D barcodes are in use, 6 studied
    • database 2D barcodes = initially industrial
      • QR Code
      • VSCode
      • Data Matrix
    • Index-based 2D barcodes = invented for phones
      • Visual Code
      • ShotCode
      • ColorCode
  • 5. Denso Wave QR Code - 1994 Position detection patterns, located at three of symbol’s corners
  • 6. 3 Position detection
  • 7. Data Contents
    • QR Code can encode all types of data including symbols, binary data, control codes, and multimedia data. The maximum data capacities are
    • 7,089 characters for numeric data,
    • 4,296 characters for alphanumeric data,
    • 2,953 bytes for binary data, and
    • 1,817 characters for Japanese Kanji and Kana data.
  • 8. Comparison with 1-D Bar Code
  • 9. Solomon Reed Encoding
  • 10. Redundancy
    • Level L approximately 7 percent,
    • M approximately 15 percent
    • Q approximately 25 percent
    • H approximately 30 percent
  • 11. Code can be decomposed into smaller patterns
  • 12.  
  • 13. Veritec VSCode Biometric data for access-control applications. 4,151 bytes
  • 14. Data Matrix
    • 1,556 bytes
  • 15. Visual Code
    • HCI using camera phones 83 bits –mouse
  • 16. ShotCode Ternary Code 102011221210001 Original Spot Code
  • 17. ColorCode
    • 10 digits matrix of 5 cells rendered— black, blue, green, and red.
    • error parity check that detects any incorrect color recognition and corrects it
    • 40 percent visibility
  • 18.  
  • 19.  
  • 20. Results
  • 21. Results
    • Resolution not so important
    • 2D barcodes (21.7 cm) >
    • index-based 2D-barcodes (16.9 cm)