This paper proposes a visuo-auditory substitution method to assist visually impaired people in scene understanding. Our approach focuses on person localisation in the user’s vicinity in order to ease urban walking. Since a real-time and low-latency is required in this context for user’s security, we propose an embedded system. The processing is based on a lightweight convolutional neural network to perform an efficient 2D person localisation. This measurement is enhanced with the corresponding person depth information, and is then transcribed into a stereophonic signal via a head-related transfer function. A GPU-based implementation is presented that enables a real-time processing to be reached at 23 frames/s on a 640×480 video stream. We show with an experiment that this method allows for a real-time accurate audio-based localization.
Low-latency human-computer auditory interface based on real-time vision analysis
