找包含mask的最小矩形~python

            f_label_img = cv2.imread('1.jpg')

            f_label_img = cv2.cvtColor(f_label_img, cv2.COLOR_BGR2GRAY)
            contours, hierarchy = cv2.findContours(f_label_img, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)
            rect = cv2.minAreaRect(contours[0])
            points = cv2.boxPoints(rect)
            box = np.int0(points)
            left_point_x = np.min(box[:, 0])
            right_point_x = np.max(box[:, 0])
            top_point_y = np.min(box[:, 1])
            bottom_point_y = np.max(box[:, 1])