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. 2014 Jun 3;9(6):e98806. doi: 10.1371/journal.pone.0098806

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© 2014 Guan et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(a) The database panorama is partitioned into 6 parts equally. “0–59” represents that the part 1 ranges from 0 to 59 degree. (b) Illustration of heading-aware method for database. Stars, triangles, and circles represent different visual words.