FIGURE 4.

Contextual aspects stages for activity and event analysis. Stage 1: estimation and overlay of the activity map on the ICU space, tagging and localization of ICU-objects; detection, tracking, localization of people and objects (foreign to the ICU) on the map. Stage 2: computation of interaction cones as individuals and ICU-objects relative orientations and distances, identification of the activity grid, and estimation of activities duration. Stage 3: combination of aspects to create logs, estimation of activity labels, localization of activities in time, and computation sanitation-event qualifiers.