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http://dx.doi.org/10.9708/jksci.2011.16.12.093

Vision-based Walking Guidance System Using Top-view Transform and Beam-ray Model  

Lin, Qing (Dept. of Electronic Engineering, Soongsil University)
Han, Young-Joon (Dept. of Electronic Engineering, Soongsil University)
Hahn, Hern-Soo (Dept. of Electronic Engineering, Soongsil University)
Publication Information
Journal of the Korea Society of Computer and Information / v.16, no.12, 2011 , pp. 93-102 More about this Journal
Abstract
This paper presents a walking guidance system for blind pedestrians in an outdoor environment using just one single camera. Unlike many existing travel-aid systems that rely on stereo-vision, the proposed system aims to get necessary information of the road environment by using just single camera fixed at the belly of the user. To achieve this goal, a top-view image of the road is used, on which obstacles are detected by first extracting local extreme points and then verified by the polar edge histogram. Meanwhile, user motion is estimated by using optical flow in an area close to the user. Based on these information extracted from image domain, an audio message generation scheme is proposed to deliver guidance instructions via synthetic voice to the blind user. Experiments with several sidewalk video-clips show that the proposed walking guidance system is able to provide useful guidance instructions under certain sidewalk environments.
Keywords
walking guidance system; top-view transform; optical flow; multimodal information transform;
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