Invisibility Cloak: Personalized Smartwatch-Guided Camera Obfuscation

Cameras are in their golden age due to recent advances in visual AI techniques that significantly extend the applicability and accuracy of vision-based applications including healthcare, entertainment, and security. In public environments, individuals usually have different and changing privacy preferences against their visual information being shared with other entities. To accommodate these varying user needs for visual privacy, we created Invisibility Cloak , a camera obfuscation technique leveraging inertial signals collected from smartwatches to guide an edge device to remove visual information from camera recordings before they are streamed out for cloud-based inferences. Specifically, a smartwatch user can select an obfuscation level that fits their privacy preference in that context and cameras in the environment will use smartwatch signals to identify that user and remove visual information associated with the user. On the conceptual level, our system demonstrates a privacy design rationale which removes information to be shared with a broader internet infrastructure (i.e., cloud) by providing more information to a trusted local camera system (i.e., camera sensor + edge computing device). We developed a custom data-association pipeline and collected data from real-world configurations. Evaluation of our pipeline indicates a user identification accuracy of 95.48% among 10 individuals when our system is provided with only 2 seconds of data.