python opencv 霍夫圆变换

最新推荐文章于 2025-05-30 08:47:55 发布

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最新推荐文章于 2025-05-30 08:47:55 发布

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本文介绍如何使用Python和OpenCV库进行图像中的圆检测。通过读取图像，应用中值模糊，转换为彩色图像，然后使用HoughCircles函数来检测圆形。最后，程序会在检测到的圆形周围绘制外圈，并标记圆心。

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import cv2
import numpy as np

img = cv2.imread('touxiang.jpg',0)
img = cv2.medianBlur(img,5)
cimg = cv2.cvtColor(img,cv2.COLOR_GRAY2BGR)

circles = cv2.HoughCircles(img,cv2.HOUGH_GRADIENT,1,20,param1=50,param2=30,minRadius=100,maxRadius=200)
print(circles[0])
circles = np.uint16(np.around(circles))
for i in circles[0,:]:
    # draw the outer circle
    cv2.circle(cimg,(i[0],i[1]),i[2],(0,255,0),2)
    # draw the center of the circle
    cv2.circle(cimg,(i[0],i[1]),2,(0,0,255),3)

cv2.imshow('detected circles',cimg) 
cv2.waitKey(0)
cv2.destroyAllWindows()

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