如何在OpenCV中计算每个圆圈的像素数？

import cv2
import numpy as np

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

# 图像预处理
image = cv2.medianBlur(image, 5)
ret, image = cv2.threshold(image, 127, 255, cv2.THRESH_BINARY)

# 圆圈检测
circles = cv2.HoughCircles(image, cv2.HOUGH_GRADIENT, 1, 20, param1=50, param2=30, minRadius=0, maxRadius=0)

# 计算像素数
if circles is not None:
    circles = np.uint16(np.around(circles))
    for circle in circles[0, :]:
        center = (circle[0], circle[1])
        radius = circle[2]
        # 计算像素数
        pixel_count = 0
        for i in range(center[1] - radius, center[1] + radius):
            for j in range(center[0] - radius, center[0] + radius):
                if (i - center[1]) ** 2 + (j - center[0]) ** 2 <= radius ** 2:
                    pixel_count += 1
        print("圆心坐标：", center)
        print("半径：", radius)
        print("像素数：", pixel_count)