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EQPC

Diameter of a circle that has the same area as the projection area of the region of interest.

🔎 ROI options and parameters of eqpc accessor

EQPC represents a circle of equal projection area. This means that it is a diameter of a circle that has the same area as an object of interest. It is widely used for the evaluation of particles sizes from the projection area A of a non-spherical particle.

roi image

The formula finds diameter from potential circle's surface:

EQPC=2SurfaceπEQPC = 2\sqrt{\frac{Surface}{\pi}}

In ImageJS EQPC is a ROI class accessor that returns a diameter length in pixels:

const eqpcResult = roi.eqpc;