Measurements > Feature Measurements

Feature Measurements allows you to select a number of type of measurements you would like to generate based on your features you have in your image.

1. Measurements

  • Area: Area of each feature.
  • Area Fraction: Area fraction occupied by each feature relative to entire image.
  • Centroid: Centroid location of each feature.
  • Convex Area/Area: Ratio of area of tightest-fitting convex hull and area of each feature.
  • Filled Area: Area of each feature with holes filled in.
  • First Moment of Inertia: First moment of each feature. Describes how much feature area is extended away from its centroid.
  • Eccentricity: Describes how elongated or circular each feature is. 0 is a perfect circle. 1 is a straight line.
  • Equivalent Diameter: Diameter of each feature if each was a circle of the same area.
  • Length – X: Length of each feature’s bounding box in the X-direction.
  • Length – Y: Length of each feature’s bounding box in the Y-direction.
  • Major Axis Length: Major axis length of ellipse fit to each feature.
  • Minor Axis Length: Minor axis length of ellipse fit to each feature.
  • Orientation: Angle of the ellipse fit to each feature with respect to the positive X-axis. Positive angles are clockwise rotations and negative counterclockwise.
  • Perimeter: Length of perimeter of each feature.
  • Perimeter/Area: Perimeter of each feature relative to its area.
  • Moment Invariants: High-order moments which describe different shape properties of each feature [1,2].
  • Nearest Neighbor Distance: Each feature’s distance to the closest other feature.
  • Intercepts: Measures statistics from intercept length recorded from each feature.
    - Through Centroid: Draw each line through each feature’s centroid.
    - Along Vector: Draw each line along the same direction through each feature.

2. Based on Companion Image

Requires Companion Image

  • Features: Number of features in the Companion Image which are within or in contact with each feature in the Current Image.
  • Centroids: Number of centroids in the Companion Image within each feature in the Current Image.
  • Avg. Area: Average area of features in the Companion Image within each feature in the Current Image.
  • Total area: Total area of features in the Companion Image within each feature in the Current Image.
  • Total Perim.: Total perimeter length of features in the Companion Image within each feature in the Current Image.
  • Avg. Perim.: Average perimeter length of features in the Companion Image within each feature in the Current Image.
  • Intensity Mean: Average grayscale intensity in the Companion Image within each feature in the Current Image.
  • Intensity StdDev: Standard deviation of grayscale intensity in the Companion Image within each feature in the Current Image.

3. Save Measurement File As

The “Set” button will allow you to choose where you would like the measurement results to be saved.

References

[1] Rosin, Paul L. 2003. “Measuring Shape: Ellipticity, Rectangularity, and Triangularity.” Machine Vision and Applications 14 (3): 172–184.

[2] MacSleyne, J P, J P Simmons, and M De Graef. 2008. “On the Use of Moment Invariants for the Automated Analysis of 3D Particle Shapes.” Modelling and Simulation in Materials Science and Engineering 16 (4) (June 1): 045008.

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