This paper studies the stages of planning andanalysis used to determine the influence of certain factors incontrolling geometric figures dimension by computer vision. Itwas used as bases techniques used as image processing toinspect objects, in order to reduce measurement errors inexisting manual process. It uses the 3k factorial design where itis assessed that it's possible of processing a digital image of aparticular geometric figure whose dimensions are known. Itwill determine the measurement uncertainty by Monte Carlo(MMC). Finally, it was possible to reject the null hypothesisthat the size does not influence the result at dimensional figure.