This paper proposes a method to estimate the directions of vertical surfaces in outdoor environments based on the changes of the incident angle of the sunlight in a series of observation images caught with a fixed camera. This method uses an interaction between a time when an incidence angle of the sunlight for every direction of a vertical surface is at the minimum and a time when a brightness of every pixel in the series of observation image is at the maximum. This method is not robust about the weather changes. This paper introduces the method integrating multi-day estimations. With this multi-day integration, the proposed direction estimation method is robust about the weather changes. And then, this paper shows experiments on real out-door images.

Date Published: 16 April 2014
PDF: 7 pages
Proc. SPIE 9159, Sixth International Conference on Digital Image Processing (ICDIP 2014), 91590A (16 April 2014); doi: 10.1117/12.2064057

Published in SPIE Proceedings Vol. 9159:
Sixth International Conference on Digital Image Processing (ICDIP 2014)
Charles M. Falco; Chin-Chen Chang; Xudong Jiang, Editor(s)