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dc.contributor.authorSandnes, Frode Eika
dc.date.accessioned2011-01-07T12:36:59Z
dc.date.available2011-01-07T12:36:59Z
dc.date.issued2010
dc.identifier.citationSandnes, F. (2010). Towards calibration-free geo-localization of stationary outdoor webcams. I: E. Hjelmås (Red.), Norsk Informatikkonferanse. Trondheim: Tapir akademiske forlag.en_US
dc.identifier.isbn978-82-519-2702-4
dc.identifier.issnPrint: 1892-0713
dc.identifier.issnOnline: 1892-0721
dc.identifier.urihttps://hdl.handle.net/10642/536
dc.description.abstractThis study proposes two strategies for determining the approximate geographical location of outdoor webcams based on time-series comprising regularly sampled images. The strategies require an accurate account of universal time and the date to be known, then the intensity of the images are used to estimate the sunrise and sunset times. Given accurate sunrise and sunset times a celestial model can be used to extract the latitude and longitude of the webcam. Webcams vary in quality, dynamic pixel depth and sensitivity to light. Two strategies are therefore proposed for avoiding the need to perform calibration. The first technique involves normalizing and noise-damping the image intensity measurements. The second technique employs a self-normalizing brightness ratio. The brightness ratio is computed from the overall brightness of the upper part of the image in relation to the bottom part. During day the sky is much brighter than the ground, while at night the sky is much darker than the ground if the ground is lit up. Experiments demonstrate that the intensity normalization strategy is the most robust and it is capable of determining the geographical location of webcams with an accuracy of approximately 2 degrees.en_US
dc.language.isoengen_US
dc.publisherTapir Akademisk Forlagen_US
dc.relation.ispartofseriesNorsk Informatikkonferanse; 2010
dc.subjectWebcamsen_US
dc.subjectWebcamerasen_US
dc.subjectGeolocationen_US
dc.subjectImage analysisen_US
dc.subjectVDP::Teknologi: 500::Informasjons- og kommunikasjonsteknologi: 550::Geografiske informasjonssystemer: 555en_US
dc.subjectVDP::Teknologi: 500::Informasjons- og kommunikasjonsteknologi: 550::Datateknologi: 551en_US
dc.titleTowards calibration-free geo-localization of stationary outdoor webcamsen_US
dc.typeChapteren_US
dc.typePeer revieweden_US
dc.identifier.doihttp://www.nik.no/2010/19-Sandnes.pdf


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