Table 1 Results of error of area and perimeter for various sizes of test circle images
From: New parameter of roundness R: circularity corrected by aspect ratio
Width of test circle image (pixel) | A I | P I | 2·r | A | P | ΔA (%) | ΔP (%) |
|---|---|---|---|---|---|---|---|
Area measured by ImageJ (pixel) | Perimeter measured by ImageJ (pixel) | Major and minor axis length measured by ImageJ | Area calculated by p·r 2 | Perimeter calculated by 2·p·r | |||
1 | 1 | 2.828 | 1.128 | 0.999328 | 3.543716 | 0.067260 | −20.196760 |
2 | 4 | 5.657 | 2.257 | 4.000856 | 7.090573 | −0.021393 | −20.218015 |
3 | 9 | 9.657 | 3.385 | 8.999267 | 10.634289 | 0.008145 | −9.189979 |
4 | 12 | 11.314 | 3.909 | 12.001102 | 12.280483 | −0.009184 | −7.870074 |
6 | 32 | 19.314 | 6.383 | 31.999226 | 20.052782 | 0.002417 | −3.684186 |
8 | 52 | 24.971 | 8.137 | 52.001806 | 25.563134 | −0.003472 | −2.316360 |
11 | 97 | 34.627 | 11.113 | 96.995686 | 34.912512 | 0.004447 | −0.817792 |
16 | 208 | 52.284 | 16.274 | 208.007222 | 51.126268 | −0.003472 | 2.264456 |
23 | 421 | 75.598 | 23.152 | 420.985191 | 72.734138 | 0.003518 | 3.937439 |
32 | 804 | 104.569 | 31.995 | 803.996244 | 100.515236 | 0.000467 | 4.032985 |
45 | 1581 | 147.196 | 44.866 | 1580.973153 | 140.950667 | 0.001698 | 4.430865 |
64 | 3196 | 211.48 | 63.791 | 3196.013548 | 200.405295 | −0.000424 | 5.526154 |
90 | 6320 | 296.735 | 89.704 | 6319.946608 | 281.813369 | 0.000845 | 5.294863 |
128 | 12,796 | 422.96 | 127.642 | 12796.081336 | 400.999086 | −0.000636 | 5.476550 |
181 | 25,565 | 597.47 | 180.417 | 25564.935720 | 566.796604 | 0.000251 | 5.411711 |
254 | 51,104 | 842.607 | 255.084 | 51104.156942 | 801.369854 | −0.000307 | 5.145832 |
360 | 102,252 | 1193.97 | 360.82 | 102251.807881 | 1133.549225 | 0.000188 | 5.330229 |
510 | 204,520 | 1690.871 | 510.297 | 204520.017549 | 1603.144973 | −0.000009 | 5.472121 |
722 | 408,932 | 2391.253 | 721.574 | 408932.420696 | 2266.891106 | −0.000103 | 5.486011 |
1020 | 818,196 | 3381.743 | 1020.666 | 818195.500707 | 3206.516140 | 0.000061 | 5.464712 |
1442 | 1,636,024 | 4893.536 | 1443.278 | 1636024.391899 | 4534.190619 | −0.000024 | 7.925238 |