Match of the contours

Question

I created the program below, to make the correction of tests.

https://gist.github.com/andreemidio/d2cdf3d301fd8df1677e9a315ff845f0

I was able to outline, identify the fillers, I need to match the information.

Each line returns me 30 rectangular outlines, of which the filled ones are identified. now I need to know the position of these filled alveoli inside this array.So I return the answer of the question and the selected option

The result for visualization is this

Image to be processed.

I believe that the question of the match of information lies in that part of the code.

posicaoRespostas = np.empty(0,int)

for (q, i) in enumerate(np.arange(0, len(questionCnts), 30)):


    cnts = contours.sort_contours(questionCnts[i:i+30])[0]

    for (l ,k )in enumerate(cnts):
        (x, y, w, h) = cv2.boundingRect(k)
        if (w >= 20 and h >= 20) and (w <= 25  and h <= 25) and ar >= 0.7 and ar <= 1.3:
            box = [(x//5)*5, y]
        #print(x, y)

        posicaoRespostas = np.append(posicaoRespostas,(l))

        cv2.rectangle(bolhas, (x, y), (x+w, y+h), (0, 0, 255), 1) #desenho para visualização