Figure 4
Frequency distribution of the ratio between average retrieval precision and a-priori probability value relative to the group of atypical nevi. The analysis has been performed considering the first 12 retrieved images. The average retrieval precision is the ratio of the relevant atypical nevi retrieved images to the total retrieved ones, and the a-priori probability the a-priori probability is the percentage of the atypical nevi with respect to the total number of the archive images.