Don't Share My Face: Privacy Preserving Inpainting for Visual Localization

Abstract

Visual localization is an important task for many robotic and augmented reality applications. As localizing within large scale maps can be memory and computationally de-manding, cloud-based localization services are appealing for developers. However, such services raise important privacy concerns for both passive and active users. In particular, some sensitive information might be revealed by an attacker who intercepts data during the data-sharing process. Therefore, the sensitive data in the image should be concealed before it is shared. As a motivating case, we demonstrated the exposure generated by the common feature descriptor SIFT when attempting to recover private content. In this paper, we propose a pipeline to effectively conceal privacy-sensitive image regions from possible attacks to the transmission or localization services, by making use of learning-based image inpainting techniques while preserving, and even boosting, the localization performance. We tested our pipeline with two off-the-shelf localization services based on deep neural networks on the publicly available Oxford Robotcar dataset, showing that the localization performance on our generated private concealed images is on par with the non-private baseline. 1