### 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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