opencv找圆弧的圆心

以下是使用OpenCV找圆弧圆心的步骤：

1. 读取图像并将其转换为灰度图像。

import cv2

img = cv2.imread('image.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

2. 对图像进行模糊处理，以减少噪声。

gray_blur = cv2.medianBlur(gray, 5)

3. 使用霍夫圆变换检测圆弧。

circles = cv2.HoughCircles(gray_blur, cv2.HOUGH_GRADIENT, 1, 20, param1=50, param2=30, minRadius=0, maxRadius=0)

4. 提取圆心坐标并绘制圆心。

if circles is not None:
    circles = np.round(circles[0, :]).astype("int")
    for (x, y, r) in circles:
        cv2.circle(img, (x, y), 3, (0, 255, 0), -1)

完整代码如下：

import cv2
import numpy as np

img = cv2.imread('image.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
gray_blur = cv2.medianBlur(gray, 5)
circles = cv2.HoughCircles(gray_blur, cv2.HOUGH_GRADIENT, 1, 20, param1=50, param2=30, minRadius=0, maxRadius=0)

if circles is not None:
    circles = np.round(circles[0, :]).astype("int")
    for (x, y, r) in circles:
        cv2.circle(img, (x, y), 3, (0, 255, 0), -1)

cv2.imshow("output", img)
cv2.waitKey(0)