Chapter 9: Edge Finder

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This chapter explains how to use the MIL Edge Finder module to extract and analyze edges in your image.

• MIL Edge Finder module
• • Edges and Edge Finder
• Steps to extract and analyze edges
• Basic concepts for the MIL Edge Finder module
• Extracting the edges
• • Basics of edge extraction
  • Object contours versus line crests
  • • Object contours
    • Line crests
  • How edges are calculated
  • • Object contours
    • Line crests
• Customizing the edge extraction settings
• • Filter type
  • • Infinite Impulse Response (IIR) filters
    • Finite Impulse Response (FIR) filters
  • Smoothing for IIR filters
  • Thresholding
  • Edgel accuracy
  • Magnitude type
  • Filling the edge gaps
  • • Candidate constraint
    • Region constraint
    • Polarity constraint
    • Continuity constraint
• Edge features
• • Dimension features
  • • Feret diameter
    • Circle fit and line fit
    • Ellipse fit
  • Location features
  • Advanced features
  • • Convex perimeter
    • Tortuosity
    • Moment elongation
  • Grouped features
• Calculating and retrieving results
• • Sorting keys
  • Retrieving the results
  • Selecting the results
  • • Edge selection based on edge features
    • Edge selection based on the inter-relationship of edges
    • Edge selection based on the proximity of the edges to a point
  • Internal processing buffers
  • • Derivatives
    • Angles
    • Magnitude
    • Source image and mask
  • Post-calculation
  • • Restrictions
  • Annotating the results
• Advanced edge extraction
• • Approximating the edges
  • Masking the edges
  • Cropping the edges
  • Advanced thresholding
  • Providing the image's derivatives
  • Putting data into an Edge Finder result buffer
  • Finding the closest edgels to a list of points
  • • Location-based constraints
    • Edgel-based constraints
• Optimizing edge extractions
• • Specify an area to process
  • Perform post-calculation
  • Optimize your control type settings
  • • Adjust the accuracy
    • Building edge chains
    • Adjust the extraction scale
    • Specifying the IIR filter mode
    • Specify the smoothness
    • Specify the magnitude
    • Setting the threshold
    • Calculating the length of each edge
    • Limiting the search radius
  • Retrieving calibrated results
• Interfacing with Geometric Model Finder
• MIL Edge Finder example