Chapter 16: Measurement

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This chapter describes how to use the MIL Measurement module to find and measure image characteristics (referred to as markers).

• MIL Measurement module
• Steps to finding and obtaining measurements of markers
• Basic concepts for the MIL Measurement module
• Markers
• • Marker types
  • A multiple-occurrence marker
• Search algorithm
• • First derivative filter
  • Minimum variation
  • Retrieving and drawing edge information
• Search region
• • Box search region
  • • Setting the size and position of the search region
    • Using drawings to verify the search region placement
    • Marker orientation and search direction
    • Search region clipping
    • Setting the angle of the box search region
    • Multiple-angle search for a marker
    • Determining the rotation tolerance of a marker
    • Subregions of the box search region
  • Ring search region
  • • Placing the ring search region
    • Subregions of the ring search region
• Marker characteristics
• • Essential characteristics
  • Score characteristics
• Edge markers: basic characteristics that should be specified
• • Polarity
  • Minimum edgevalue
• Edge markers: advanced characteristics that can be specified
• • Essential characteristics
  • • Maximum association distance of subedges
    • Minimum variation
  • Score characteristics
  • • Strength score
    • Contrast score
    • Position score
• Stripe markers: basic characteristics that should be specified
• • Polarity
• Stripe markers: advanced characteristics that can be specified
• • Essential characteristics
  • • Inclusion point
    • Maximum association distance of subedges
  • Score characteristics
  • • Edges inside a stripe marker
    • Stripe width
• Circle markers: basic and advanced characteristics that should or can be specified
• • Essential characteristics
  • • Polarity
    • Maximum association distance of subedges
  • Score characteristics
  • • Radius
• Multiple-occurrence marker characteristics
• Score characteristics
• • Setting limits
  • Using score characteristics
  • • Final score
  • Lowest possible score and score-offset
• Search results
• • Finding the marker and taking measurements
  • Edge measurements taken by the find operation
  • • Line equation (mean line)
    • Angle
    • Length
    • Position and reference position
    • Intersection point
    • An edge's start, end, and width (based on the intensity profile)
    • An edge peak's maximum/minimum position and width (based on the first derivative)
  • Stripe measurements taken by the find operation
  • • Line equation (mean line)
    • Angle
    • Length
    • Position and reference position
    • Stripe width
    • Maximum association distance of subedges
  • Circle measurements taken by the find operation
  • • Position and reference position
    • Maximum association distance of subedges
    • Radius
  • Drawing
• Measurements between two markers
• • Steps to taking measurements between two markers
  • Specifying the measurement context and control settings
  • Calculating with multiple-occurrence markers
  • Angle
  • Line equation and distance
• Measurement examples
• • Circle markers and advanced settings