National Instruments IMAQTM User Manual

cwimaqMeasurementConvexHullPerimeter

Perimeter of the smallest convex 
polygon containing all points in the 
particle. 

cwimaqMeasurementElongationFactor

Max Feret Diameter divided by 
Equivalent Rect Short Side (Feret). 

cwimaqMeasurementEquivalentEllipseMajorAxis

Length of the major axis of the ellipse 
with the same perimeter and area as the 
particle. 

cwimaqMeasurementEquivalentEllipseMinorAxis

Length of the minor axis of the ellipse 
with the same perimeter and area as the 
particle. 

cwimaqMeasurementEquivalentEllipseMinorAxisFeret

Length of the minor axis of the ellipse 
with the same area as the particle, and 
Major Axis equal in length to the Max 
Feret Diameter. 

cwimaqMeasurementEquivalentRectDiagonal

Distance between opposite corners of 
the rectangle with the same perimeter 
and area as the particle. 

cwimaqMeasurementEquivalentRectLongSide

Longest side of the rectangle with the 
same perimeter and area as the particle. 

cwimaqMeasurementEquivalentRectShortSide

Shortest side of the rectangle with the 
same perimeter and area as the particle. 

cwimaqMeasurementEquivalentRectShortSideFeret

Shortest side of the rectangle with the 
same area as the particle, and longest 
side equal in length to the Max Feret 
Diameter. 

cwimaqMeasurementFirstPixelX

X-coordinate of the highest, leftmost 
particle pixel. 

cwimaqMeasurementFirstPixelY

Y-coordinate of the highest, leftmost 
particle pixel. 

cwimaqMeasurementHeywoodCircularityFactor

Perimeter divided by the circumference 
of a circle with the same area. 

Table 4-1.  Measurement Types (Continued)