⭕ Simulator: Circularity Filtering
C = 4πA / P²
Threshold C
0.60
Accepted
0
Rejected
0
Accepted (C ≥ threshold)
Rejected (C < threshold)
🧠 Circularity Formula
The metric C = 4πA / P² relates the area A of the component to the square of its perimeter P.
For a perfect circle, C = 1; for more irregular or elongated shapes, C approaches 0.
In the MCTest context, a threshold such as C > 0.60 selects the reference discs, discarding texts, lines, and artifacts from the answer sheet.
Description: Figure 6.9: Interactive simulator of circularity filtering: move the slider to adjust the threshold C and observe which components are accepted (green) or rejected (red).