Geometric information from single uncalibrated images of roads

dc.contributor.author	Γραμματικόπουλος, Λάζαρος	el
dc.contributor.author	Καρράς, Γιώργος	el
dc.contributor.author	Πέτσα, Έλλη	el
dc.date.accessioned	2015-01-29T09:52:20Z
dc.date.available	2015-01-29T09:52:20Z
dc.date.issued	2015-01-29
dc.identifier.uri	http://hdl.handle.net/11400/5024
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.subject	Geometry, Projective
dc.subject	Calibration
dc.subject	Video
dc.subject	Sequences (Mathematics)
dc.subject	Γεωμετρία, Προβολική
dc.subject	Βαθμονόμηση
dc.subject	Βίντεο
dc.subject	Ακολουθίες
dc.title	Geometric information from single uncalibrated images of roads	en
heal.type	conferenceItem
heal.classification	Technology
heal.classification	Photogrammetry
heal.classification	Τεχνολογία
heal.classification	Φωτογραμμετρία
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85133147
heal.classificationURI	http://skos.um.es/unescothes/C02980
heal.classificationURI	N/A-Τεχνολογία
heal.classificationURI	N/A-Φωτογραμμετρία
heal.keywordURI	http://id.loc.gov/authorities/subjects/sh85054157
heal.keywordURI	http://id.loc.gov/authorities/subjects/sh85120145
heal.language	en
heal.access	free
heal.recordProvider	Τ.Ε.Ι. Αθήνας, Σχολή Τεχνολογικών Εφαρμογών, Τμήμα Μηχανικών Πληροφορικής και Μηχανικών Τοπογραφίας & Γεωπληροφορικής	el
heal.publicationDate	2002
heal.bibliographicCitation	Grammatikopoulos, L., Karras, G. and Petsa, E. (2002). Geometric information from single uncalibrated images of roads. International Atchives of Photogrammetry & Remote Sensing, 34(B5), pp. 21-26. Available from: http://portal.survey.ntua.gr/main/labs/photo/staff/gkarras/Karras_isprs02a.pdf.	en
heal.abstract	Video sequences of road and traffic scenes are now used for various purposes. The framework of this research on the metric potential of single uncalibrated images is road mapping and studies of the traffic character of freeways. In the first case, an approach has been developed to extract lane width in straight road segments exploiting sequences from a forward looking camera. Apart from an initial reference width, necessary for calibrating camera height, no intrinsic or extrinsic calibration is required if frontal image acquisition is assumed. This approach, making use of the vanishing point of the road, gave an accuracy better than 5 cm in lane width. The second technique regards the measurement of vehicle speed, given the time interval between frames of a stationary camera tilted downwards. Here, too, the vanishing point in the direction of the road is used, with the vanishing point of the orthogonal direction assumed at infinity. Given one known ground distance along the road axis, the projective distortion of the ground plane is removed, allowing an affine rectification and, thus, 1D measurement in the correctly scaled road direction. This approach, evaluated against rigorous 2D-2Dprojective transformation and GPS measurements, has given a satisfactory estimated accuracy in vehicle speed of about 3 km/h.	en
heal.fullTextAvailability	true
heal.conferenceName	International Atchives of Photogrammetry & Remote Sensing.	en
heal.conferenceItemType	full paper