1. Coughlan, J., Manduchi, R.: A mobile phone wayfinding system for visually impaired users. Assist. Technol. Res. Ser. 25(2009), 849 (2009)
2. Lecture Notes in Computer Science (Lecture Notes in Artificial Intelligence);D Chen,2012
3. Lecture Notes in Computer Science;S Ritterbusch,2012
4. Lecture Notes in Computer Science;B Schauerte,2015
5. Fürst, M.: Detecting drivable regions in monocular images. Robotour 2015: Autonomous Robot in Parks and Urban Regions (2015)