[Solved] How to calculate the number of shapes detected after thresholding

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Jeru’s answer is correct for this case. If you have a case with bigger noise where morpholigocal operations won’t take them out, you can make a cutoff with the contour size, something like

for contour in contours
    if cv2.contourArea(contour) > minimal_length

before counting

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solved How to calculate the number of shapes detected after thresholding