In this paper, machine learning and geometric computer vision are combined for the purpose of automatic reading bus line numbers with a smart phone. This can prove very useful to improve the autonomy of visually impaired people in urban scenarios. The problem is a challenging one, since standard geometric image matching methods fail due to the abundance of distractors, occlusions, illumination changes, highlights and specularities, shadows, and perspective distortions. The problem is solved by locating the main geometric entities of the bus fa¸cade through a cascade of classifiers, and then refining the matching with robust geometric matching. The method works in real time and, as experimental results show, has a good performance in terms of recognition rate and reliability.

Automatic bus line number localization and recognition on mobile phones-a computer vision aid for the visually impaired / Claudio Guida; Dario Comanducci; Carlo Colombo. - STAMPA. - (2011), pp. 323-332. (Intervento presentato al convegno 16th International Conference on Image Analysis and Processing ICIAP 2011 tenutosi a Ravenna, Italy nel September 2011).

Automatic bus line number localization and recognition on mobile phones-a computer vision aid for the visually impaired

COLOMBO, CARLO
2011

Abstract

In this paper, machine learning and geometric computer vision are combined for the purpose of automatic reading bus line numbers with a smart phone. This can prove very useful to improve the autonomy of visually impaired people in urban scenarios. The problem is a challenging one, since standard geometric image matching methods fail due to the abundance of distractors, occlusions, illumination changes, highlights and specularities, shadows, and perspective distortions. The problem is solved by locating the main geometric entities of the bus fa¸cade through a cascade of classifiers, and then refining the matching with robust geometric matching. The method works in real time and, as experimental results show, has a good performance in terms of recognition rate and reliability.
2011
ICIAP 2011
16th International Conference on Image Analysis and Processing ICIAP 2011
Ravenna, Italy
September 2011
Claudio Guida; Dario Comanducci; Carlo Colombo
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/792329
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