Mobile Video-to-Audio Transducer and Motion Detection for Sensory Substitution

Frontiers in ICT

Pfister, Philippe¹  Ambard, Maxime⁴  Benezeth, Yannick⁵ 

[1] de Bourgogne Franche-Comté, France;Laboratoire d’Electronique, Informatique et Image (LE2I), CNRS UMR 6306, UniversitéLaboratoire d’Etude de l’Apprentissage et du Développement (LEAD), CNRS UMR 5022, Université

关键词: sensory substitution;    Blindness;    mobile device;    video processing;    Audio synthesis;    motion detection;    Sonification;   

DOI  :  10.3389/fict.2015.00020

学科分类：计算机网络和通讯

来源: Frontiers

【 摘 要 】

Visuo-auditory sensory substitution systems are augmented reality devices that translate a video stream into an audio stream in order to help the blind in daily tasks requiring visuo-spatial information. In this work, we present both a new mobile device and a transcoding method specifically designed to sonify moving objects. Frame differencing is used to extract spatial features from the video stream and two-dimensional spatial information is converted into audio cues using pitch, interaural time difference and interaural level difference. Using numerical methods, we attempt to reconstruct visuo-spatial information based on audio signals generated from various video stimuli. We show that despite a contrasted visual background and a highly lossy encoding method, the information in the audio signal is sufficient to allow object localization, object trajectory evaluation, object approach detection, and spatial separation of multiple objects. We also show that this type of audio signal can be interpreted by human users by asking ten subjects to discriminate trajectories based on generated audio signals.

【 授权许可】

CC BY