如何使用OpenCV从图像(拍摄目标)中裁剪出最大的圆

import cv2
import numpy as np

# 读取图像
image = cv2.imread('target_image.jpg')

# 图像预处理
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
blur = cv2.GaussianBlur(gray, (5, 5), 0)
edges = cv2.Canny(blur, 50, 150)

# 圆检测
circles = cv2.HoughCircles(edges, cv2.HOUGH_GRADIENT, dp=1, minDist=100, param1=50, param2=30, minRadius=0, maxRadius=0)

# 裁剪最大圆
if circles is not None:
    circles = np.round(circles[0, :]).astype("int")
    max_circle = max(circles, key=lambda x: x[2])
    (x, y, r) = max_circle
    cropped_image = image[y-r:y+r, x-r:x+r]

    # 显示结果
    cv2.imshow("Cropped Image", cropped_image)
    cv2.waitKey(0)
    cv2.destroyAllWindows()