barebones.py 文件源码

def solidity(contour, hull=None, area_min=0):
    """
    Calculate the solidity of a contour, which is the ratio of its area to the
    area of its convex hull.

    :param contour: the target contour
    :param hull: the convex hull of the contour, see cv2.convexHull(contour)
    :param area_min: a contour with an area below the minimum has a solidity of 0
    """
    if hull is None:
        hull = cv2.convexHull(contour)
    try:
        contour_area = cv2.contourArea(contour)
        hull_area = cv2.contourArea(hull)
        return contour_area / hull_area if hull_area > area_min else 0
    except ArithmeticError:
        return 0