By means of capturing the image of a fruit, in this case a mango; the lenticels are used as one of the criteria in determining levels of biological development in this variety of tropical fruit. It has been reported that when the fruit reaches a level of ripeness in its biological development, the lenticels (small marks) separate and disappear in such a way that the superficial density of lenticels changes continually during this process; so that when the level of biological development increases the superficial density of lenticels diminishes. This paper presents an image processing method based on a procedure that automates the process of capture, increase, improvement, definition of surface and also counts the lenticels of the image of the mango by means of binarization.