Chapter 15: Codes

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This chapter describes how to read, grade, train, detect, and write various symbols (codes).

• MIL code module
• Steps to reading, grading, or writing a code in an image
• Basic concepts for the MIL Code module
• • Technical code information
• Code context initialization modes
• Supported code types
• • 1D code types
  • 2D code types
  • Composite codes
  • Predefined SEMI code contexts
• Supported encoding schemes, sub-types, and error correction schemes by code type
• • Supported encoding schemes and sub-types
  • • Supported encoding schemes for 1D code types (except GS1 Databar)
    • Supported encoding schemes and sub-types for the GS1 Databar code type
    • Supported encoding schemes for 2D code types
    • Supported encoding scheme for composite codes
  • Supported error correction schemes
  • Extended Channel Interpretation (ECI) encoding
• Automatically detecting the code type
• Training read and grade operation settings
• • Activating the control types to train
  • Setting a code context from trained results
  • Training images and verifying the training results
  • An example
• Customizing read and grade operation settings
• • Reading and grading multiple occurrences
  • Child buffers
  • Regions of interest
  • Presearching
  • Foreground color
  • Setting the search speed
  • Timing out your search
  • Cell size and number
  • Search angular range
  • Dot spacing
  • String size
  • • Reading EAN 14 code types
    • Reading GS1-128 code types
  • Distortion
  • Thresholding
  • Determining whether your code type supports GS1
• Customizing write operation settings
• • Destination buffer size
  • Special characters
  • Foreground color
  • Cell size and number
  • Bearer bars
  • Writing EAN 14 code types
  • Writing GS1-128 code types
• Verification process and grading your code
• • Preparing your code setup for verification
  • Attributes that can be graded
  • • Understanding fixed pattern damage
    • Understanding modulation versus reflectance margin with 2D codes
    • Understanding decodability with 1D codes
  • Control types that are commonly set
  • Setting the aperture
  • • Absolute aperture setting
    • MIL calculated aperture setting
  • Determining the pixel size of your code
  • Grading using the ISO/IEC TR 29158 standard (for DPM)
• Retrieving results
• • Drawing results
• A code example