Therefore, we believe that the new roundness parameter R will be useful for performing precise statistical analyses of the roundness of particles in the future. Results from the application of R to modern beach and slope deposits showed that R is able to quantitatively separate both types of material in terms of roundness. Roundness (Border): roundness computed using the Border Perimeter. The correlation coefficient between the new parameter R and Krumbein’s roundness is 0.937 (adjusted coefficient of determination = 0.874). After installing ImageJ, create a new folder named NII, into ImageJs plugin folder. Where C I is the circularity measured using ImageJ software and C AR is the sixth-degree function of the aspect ratio measured using the same software. Based on tests of digital circle and ellipse images using ImageJ software, the effective sizes and aspect ratios of such images for the calculation of R were found to range between 1 pixels, and 10:1 to 10:10, respectively. Where Circularity perfect circle is the maximum value of circularity and Circularity aspect ratio is the circularity when only the aspect ratio varies from that of a perfect circle. R = Circularity + (Circularity perfect circle - Circularity aspect ratio) The basic concept of this new roundness parameter is given by the following equation: In this paper, we propose a new roundness parameter R, to denote circularity corrected by aspect ratio. b) Only the area decreases the perimeter does not change. a) Only the perimeter increases the area does not change. Narrow solid lines denote perfect circles before transformation. Basic concept of transformation from a perfect circle.
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