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I am trying to detect circle in a image using opencv python using the follwoing code:

    circles = cv2.HoughCircles(frame, cv2.cv.CV_HOUGH_GRADIENT, 2, 10, np.array([]), 20, 60, width/10)[0]

The type of frane is:

<iplimage(nChannels=1 width=1280 height=720 widthStep=1280 )>

When I am running this code, getting the following error:

circles = cv2.HoughCircles(frame, cv2.cv.CV_HOUGH_GRADIENT, 2, 10, np.array([]), 20, 60, width/10)[0]
TypeError: image is not a numpy array, neither a scalar

Any suggestion from my friends? Thank you inadvance

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