Roundness

tomni.contour_operations.roundness(contour: numpy.ndarray) → float[source]

Calculate the roundness of a contour.

The roundness is determined by the ratio of the area of the contour to the area of the minimum enclosing circle.

Parameters: contour (np.ndarray) – An OpenCV contour of a single object.
Returns: The roundness value, ranging from 0 to 1, where 1 indicates a perfect circle.
Return type: float

Examples

>>> contour = np.array([[[1, 2]], [[2, 3]], [[3, 2]], [[2, 1]]])
>>> roundness(contour)
0.8367346938775511