![]() Additionally, the system can achieve high detection accuracy while being self-powered by ambient light. OptoSense supports this framework through example applications ranging from object use and indoor traffic detection, to liquid sensing and multitouch input. To situate the novelty of OptoSense among prior work and highlight the generalizability of the approach, we propose a design framework of ambient light sensing surfaces, enabling implicit activity sensing and explicit interactions in a wide range of use cases with varying sensing dimensions (0D, 1D, 2D), fields of view (wide, narrow), and perspectives (egocentric, allocentric). We present OptoSense, a general-purpose self-powered sensing system which senses ambient light at the surface level of everyday objects as a high-fidelity signal to infer user activities and interactions. ![]() Battery-powered sensors require user maintenance, preventing practical ubiquitous sensor deployment. Existing solutions with cameras can be privacy-invasive. Ubiquitous computing requires robust and sustainable sensing techniques to detect users for explicit and implicit inputs. ![]()
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