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 | 1 | initial version |
contourArea unit is pixel. You can then mutiply area by your scale to have area in mm2.
That's trivial case. Things can be more complicated if your scale is not linear : pixel near center haven't got same surface than pixel far from center....
| | 2 | No.2 Revision |
contourArea unit is pixel. You can then mutiply area by your scale to have area in mm2.mm2. Area accuracy is given by perimeter I think :
AREA = CONTOURAREA +/- ARCLENGTH
That's trivial case. Things can be more complicated if your scale is not linear : pixel near center haven't got same surface than pixel far from center....
