open cv 创建一个300*300的白色画布，在画布上绘制箭靶并标注环数，圆环数横着标注，一共5圈，最里圈为红色实心圆

以下是Python代码：

import cv2
import numpy as np

# 创建一个300*300的白色画布
canvas = np.ones((300,300,3), dtype=np.uint8) * 255

# 绘制箭靶
center = (150,150)
for i in range(5):
    radius = (i+1) * 30
    color = (0, 0, 255) if i == 4 else (0, 255, 0)
    cv2.circle(canvas, center, radius, color, thickness=2)

# 标注圆环数
for i in range(5):
    text = str(i+1)
    font = cv2.FONT_HERSHEY_SIMPLEX
    font_scale = 0.5
    color = (0, 0, 0)
    thickness = 1
    text_size, _ = cv2.getTextSize(text, font, font_scale, thickness)
    text_org = (center[0]-text_size[0]//2, center[1]+(i+1)*30+text_size[1]//2)
    cv2.putText(canvas, text, text_org, font, font_scale, color, thickness)

# 显示画布
cv2.imshow("Arrow Target", canvas)
cv2.waitKey(0)
cv2.destroyAllWindows()

运行结果如下：