## 6 Design of the Monitoring System
### Storyboard View
Finally, we presented the end-user application to be exploited by an assigned guardian, defining its functional requirements and designing its main components. Particular attention was given to offering the guardian an effective exploration of the events regarding the monitored subject, without overloading them with information. The evaluation of usability of the developed system will be addressed in the near future. As further direction for future work, we plan on introducing techniques for person re-identification [57], in order to allow our system to track the subject across multiple acquisition devices, and to be robust to the presence of healthcare assistants. Consequently, we will also expand the set of recognized classes to interactions between two or more subjects. Other developments would include alternative forms of storyboarding, leaning for example on video summarization techniques [62; 63], as well as more advanced forms of user-customizable trigger conditions for alerting situations. Conceptualization, M.B. and G.C. ; methodology, M.B., A.A. and G.C. ; software, M.B. and A.A.; validation, A.A.; formal analysis, M.B. and A.A.; investigation, A.A.; resources, M.B. and G.C. ; data curation, A.A.; writing-original draft preparation, M.B., A.A. and G.C. ; writing-review and editing, M.B., A.A. and G.C. ; visualization, M.B., A.A. and G.C. ; supervision, M.B. and G.C. ; project administration, M.B. and G.C. All authors have read and agreed to the published version of the manuscript. The research leading to these results has received funding from The Home of Internet of Things (Home IoT), CUP (Codice Unico Progetto - Unique Project Code): E47H16001380009 - Call \"Linea R&S per Aggregazioni\" cofunded by POR (Programma Operativo Regionale - Regional Operational Programme) FESR (Fondo Europeo di Sviluppo Regionale - European Regional Development Fund) 2014-2020. We gratefully acknowledge the support of NVIDIA Corporation with the donation of the Jetson TX1 Kit and the Titan Xp GPU used for this research. The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results. ## References

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