how to use hough circles in cv2 with python?

geometry, hough-transform, opencv, python

Solution

`CV_HOUGH_GRADIENT` belongs to the `cv` module, so you'll need to import that:

import cv2.cv as cv

and change your function call to

circles = cv2.HoughCircles(gray,cv.CV_HOUGH_GRADIENT)

Now in current cv2 versions:

import cv2
cv2.HOUGH_GRADIENT

Problem

I have the following code and I want to detect the circle. ``` img = cv2.imread("act_circle.png") gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY) circles = cv2.HoughCircles(gray,cv2.CV_HOUGH_GRADIENT) ``` it looks like it does not have the attribute and the error is the following ``` 'module' object has no attribute 'CV_HOUGH_GRADIENT' ``` Does anybody know where this hidden parameters is? Thanks

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