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PED

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

🔎 ROI options and parameters of ped accessor

PED represents a diameter of a circle that has the same perimeter as the particle image. Similarly to EQPC it is used to evaluate ROI's sizes albeit from its perimeter and not surface.

ROI image

The formula is simple:

PED=Perimeterπ;PED = \frac{Perimeter}{\pi};

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

const pedResult = roi.ped;