A Visually Assisted Guidance System for Visually Impaired People Passing Pedestrian Crosswalks
| Autor: | Cheng-che Tsai, 蔡政哲 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 Visually impaired people always experience inconvenience to manage many issues in their daily life. Crossing the road without tactile paving becomes a great challenge to the blind, who can only rely on the tactile stick. Based on this motivation, the thesis aims to develop a portable assistive guiding system using techniques of machine vision to allow the visually impaired people can always walk on the central area of the crosswalks while crossing the road. Both safety and autonomy of visually impaired people can therefore be improved. This research incorporates image processing approaches to locate the central position of the crosswalks even affected by occlusion of pedestrians and interference of shadow. In addition, statistical approaches are also applied to reduce the influence of fault detection. A vibration device is then employed to provide information of guidance for the visually impaired people. The experiments are divided into two groups, static and dynamic images, to examine performance of the proposed middle-line detection algorithm and guidance of vibration strategy. In order to consider all possible appearances of crosswalks in the image, four different conditions, head-on without occlusion, oblique without occlusion, head-on with occlusion, and oblique with occlusion, are studied. Finally, the presented assistive guiding system demonstrates promising performance to direct a healthy person with both eyes covered walking on the crosswalks to pass through a road in the real world. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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