1. A method for characterizing keratinocytes, comprising: comparing, by one or more computing device, an unknown image segment to a known keratinocyte model image segment to determine the degree of match between the unknown segment and a model of a keratinocyte; comparing, by the one or more computing device, the determined degree of match to a predetermined value; and characterizing, by the one or more computing device, the particular segment of the sample as a keratinocyte based on the determined degree of match.