Semi-automatic model to colony forming units counting

<span lang="EN-US">Colony forming units counting is a conventional process carry out in bacteriological laboratories, and it used to follow the behavior of bacteria different conditions. Currently exist systems, automatic or semi-automatic, colony exits, but, general, many laboratories continue using manual counting, which consumes considerable time effort from researchers laboratory employees. This paper presents mathematical model segment and, this way, them digital image sample. The method uses color space information some points shows good for images with few sample, according counting. results show efficiencies close 98% MacConkey agar.</span>