python – AttributeError：’module’对象没有属性’HOUGH_GRAD

import cv2
import cv2.cv as cv
import numpy as np 


def main():
    img = cv2.imread('images/g1.jpg',0);

    print(img)

    img = cv2.medianBlur(img,5)
    cimg = cv2.cvtColor(img,cv2.COLOR_GRAY2BGR)

    circles = cv2.HoughCircles(img,cv.HOUGH_GRADIENT,1,20,param1=50,param2=30,minRadius=0,maxRadius=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,2,255),3)

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

我试图找到这个问题的解决方案,我用cv取代了cv2

circles = cv2.HoughCircles(img,maxRadius=0)

但是,我仍然得到错误.