Figure 4

Coincidence level between two different ROI types. Jaccard coefficient is shown in the y-axis against the particular VS in the x-axis. This coefficient measures the level of coincidence between the two sorts of ROIs, namely, the ones determined by the number of visits and those established when a pathologist spent a significant time exploring them. In general, there is not a systematic trend and pathologists use different navigation patterns regarding times and preferred locations. These results indicate that ROIs may be defined, depending on the application, by two different sets of features.