Conference paper

SZENTANDRÁSI István, ZACHARIÁŠ Michal, HAVEL Jiří, HEROUT Adam, DUBSKÁ Markéta and KAJAN Rudolf. Uniform Marker Fields: Camera Localization By Orientable De Bruijn Tori. In: Proceedings of the 2012 11th IEEE International Symposium on Mixed and Augmented Reality. Atlatnta, Georgia: Institute of Electrical and Electronics Engineers, 2012, pp. 1-2. ISBN 978-1-4673-4661-0.
Publication language:english
Original title:Uniform Marker Fields: Camera Localization By Orientable De Bruijn Tori
Title (cs):Uniform Marker Fields: Lokalizace kamery na základě orientovatelných De Bruijn sekvencí
Pages:1-2
Proceedings:Proceedings of the 2012 11th IEEE International Symposium on Mixed and Augmented Reality
Conference:11th IEEE International Symposium on Mixed and Augmented Reality
Place:Atlatnta, Georgia, US
Year:2012
ISBN:978-1-4673-4661-0
Publisher:Institute of Electrical and Electronics Engineers
Keywords
Fiduciary Markers, Nested Marker, Seamless Marker, Overlapping Markers, Camera Localization, Augmented Reality, De-Bruijn Tori, Genetic Algorithm, Perfect Maps, UMF
Annotation
In various applications, a wider area needs to be covered by fiduciary markers but a large marker cannot be used because only a fraction of the area is to be viewed by the camera. Such an area can be covered by a number of small markers with unique identifiers. However, with the camera freely moving in the scene and with occluders present, it is difficult to ensure that at least one of the individual markers is completely visible, unless the markers are small and numerous. In that case, the markers are not recognizable from larger distances.

In this paper we introduce the concept of Marker Fields which overcome this limitation. The Marker Field covers a large-scale planar (or non-planar) area and it is composed of mutually overlapping partial markers. We propose a particular arrangement of the Marker Field: a Uniform Checker-Board Marker Field, which is a black-and-white checkerboard whose square modules are defined by aperiodic 4-orientable binary (n,n)-window arrays (De Bruijn tori). We propose a genetic algorithm for construction of 4-orientable (n,n)-window arrays.

We used a supercomputer to synthesize large 4-orientable (n,n)-window arrays and offer them publicly for downloading. We prototyped an algorithm for detection of the checkerboard marker fields and measured its performance. When processing input video from a cellphone camera, the algorithm visits only about 5% of image pixels for reliable detection and the processing time is about 1ms on a mid-range PC processor.

The Uniform Marker Field increases freedom of camera movement, especially with occluders present in the scene. The detection algorithm is efficient and real-time marker field detection will be feasible on ultramobile devices.

BibTeX:
@INPROCEEDINGS{
   author = {Istv{\'{a}}n Szentandr{\'{a}}si and Michal
	Zachari{\'{a}}{\v{s}} and Ji{\v{r}}{\'{i}} Havel and Adam
	Herout and Mark{\'{e}}ta Dubsk{\'{a}} and Rudolf Kajan},
   title = {Uniform Marker Fields: Camera Localization By Orientable De
	Bruijn Tori},
   pages = {1--2},
   booktitle = {Proceedings of the 2012 11th IEEE International Symposium on
	Mixed and Augmented Reality},
   year = {2012},
   location = {Atlatnta, Georgia, US},
   publisher = {Institute of Electrical and Electronics Engineers},
   ISBN = {978-1-4673-4661-0},
   language = {english},
   url = {http://www.fit.vutbr.cz/research/view_pub.php?id=10122}
}

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