Sáez Martínez, Juan Manuel, Lozano, Miguel Angel, Escolano, Francisco, Pita Lozano, Javier
An efficient, dense and long-range marker system for the guidance of the visually impaired
Machine Vision and Applications. 2020, 31:57. https://doi.org/10.1007/s00138-020-01097-y
URI: http://hdl.handle.net/10045/109040
DOI: 10.1007/s00138-020-01097-y
ISSN: 0932-8092 (Print)
Abstract: 
In this paper, we address the problem of making a mobile/smartphone camera sensitive to distant fiducial markers. To this end, we carefully design a novel visual marker that is both dense and readable from large distances. The main novelty of the proposed marker is the combination of a quaternary color-based coding system with robust methods for reading the color patterns included in each frame once it is detected. These patterns include a CRC whose length grows linearly, whereas that of the message grows quadratically. Our experiments show that the proposed bundle marker-vision algorithm outperforms the alternatives in terms of distance and angle and also that it is very robust to changes in lighting conditions, thus making it a good intelligent system for guiding people with visual impairments in their day to day use of public transportation systems.
Keywords:Computer vision, Mobile vision, Visual markers, Visually impaired
Springer Nature
info:eu-repo/semantics/article