### 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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