A vision system for detecting paths and moving obstacles for the blind

José, João; Farrajota, Miguel; Rodrigues, J. M. F.; du Buf, J. M. H.

http://hdl.handle.net/10400.1/884

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Abstract(s)

In this paper we present a monocular vision system for a navigation aid. The system assists blind persons in following paths and sidewalks, and it alerts the user to moving obstacles which may be on collision course. Path borders and the vanishing point are de-tected by edges and an adapted Hough transform. Opti-cal flow is detected by using a hierarchical, multi-scale tree structure with annotated keypoints. The tree struc-ture also allows to segregate moving objects, indicating where on the path the objects are. Moreover, the centre of the object relative to the vanishing point indicates whether an object is approaching or not.

Keywords

Visão computacional

URI

http://hdl.handle.net/10400.1/884

Citation

Jose, João; Farrajota, Miguel; Rodrigues, J.M.F.; du Buf, J.M.H. A vision system for detecting paths and moving obstacles for the blind, Trabalho apresentado em DSAI 2010, In Proc. Int. Conf. on Software Development for Enhancing Accessibility and Fighting Info-exclusion (DSAI 2010), Oxford, United Kingdom, 2010.