Walimbe, Aarti, Sanchita Rao, Aishwarya Sureban, and Mrinal Shah. 2018. “Survey on Obstacle Detection and Its Notification through an Android App for Visually Impaired People”. Asian Journal For Convergence In Technology (AJCT) ISSN -2350-1146 3 (3). http://www.asianssr.org/index.php/ajct/article/view/244.