Vehicle counting - python -

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Hello im working in a little vehicle counting program. Now my code is able to:

1. Detect movement

2. Apply moments function to each frame to get the centroid of the moving cars.

But now when I have the centroid and the line where I want to count up, y dont know how to create that counter. Could someone help me?. Thankyou so much in advice. Piece of code.

frameBck = cv2.createBackgroundSubtractorMOG2(detectShadows=True)

while True:
    ret, frame1 = cap.read()
    if (type(frame1) == type(None)):
        break
    fgMask = frameBck.apply(frame1)
    contornosimg = fgMask.copy()
    im, contornos, hierarchy = cv2.findContours(contornosimg, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
    for c in contornos:

        if cv2.contourArea(c) < 200:
            continue
    if area>area2:
        m=cv2.moments(c)

        cx=int(m['m10']/m['m00'])
        cy=int(m['m01']/m['m00'])            
        (x, y, w, h) = cv2.boundingRect(c)

Thats what I have now.