Mean position of white pixels

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Thanks a lot, Tetragramm. I managed to get the centroid of the image, but am having difficulty to find the center of a single column. When I referenced the column index 0, i.e. M = cv2.moments(edges.col(0)), I get this error:

   'numpy.ndarray' object has no attribute 'col'

I have pasted my moments code that can find the centroid of an image below. Thanks again!

    M = cv2.moments(edges)

    # calculate x,y coordinate of center        
    if M["m00"] != 0:
     cX = int(M["m10"] / M["m00"])
     cY = int(M["m01"] / M["m00"])
    else:
     cX, cY = 0, 0