Circularity

The degree of circularity is calculated by dividing the 4π area by square of perimeter and represents how closely the found blob resembles a circle. If the blob is a perfect circle, this value is 1.0. The more complex the blob becomes in geometry, the smaller the value becomes.
Specify the range of degrees of circularity for judging the blob to match the model. If the degree of circularity of the found blob is within the range specified by [Min.] and [Max.], the location succeeds. If [Enable] is uncheck the box, the degree of circularity will not be checked.