Please use this identifier to cite or link to this item: http://hdl.handle.net/11400/5056
Title: Fully automatic camera calibration using regular planar patterns
Authors: Ντούσκος, Β.
Καλησπεράκης, Ηλίας
Καρράς, Γιώργος
Πέτσα, Έλλη
Item type: Conference publication
Conference Item Type: Full Paper
Keywords: Automation;Bundle;Calibration;Distortion;Non-Metric;Αυτοματισμός;Δέσμη;Βαθμονόμηση;Παραμόρφωση
Subjects: Technology
Photogrammetry
Τεχνολογία
Φωτογραμμετρία
Issue Date: 29-Jan-2015
2008
Date of availability: 29-Jan-2015
Abstract: Estimation of camera geometry represents an essential task in photogrammetry and computer vision. Various algorithms for recover-ing camera parameters have been reported and reviewed in literature, relying on different camera models, algorithms and a priori ob-ject information. Simple 2D chess-board patterns, serving as test-fields for camera calibration, allow developing interesting automa-ted approaches based on feature extraction tools. Several such ‘calibration toolboxes’ are available on the Internet, requiring varying degrees of human interaction. The present contribution extends our implemented fully automatic algorithm for the exclusive purpose of camera calibration. The approach relies on image sets depicting chess-board patterns, on the sole assumption that these consist of alternating light and dark squares. Among points extracted via a sub-pixel Harris operator, the valid chess-board corner points are automatically identified and sorted in chess-board rows and columns by exploiting differences in brightness on either side of a valid line segment. All sorted nodes on each image are related to object nodes in systems possibly differing in rotation and translation (this is irrelevant for camera calibration). Using initial values for all unknown parameters estimated from the vanishing points of the two main chess-board directions, an iterative bundle adjustment recovers all camera geometry parameters (including image aspect ratio and skewness as well as lens distortions). Only points belonging to intersecting image lines are initially accepted as valid nodes; yet, after a first bundle solution, back-projection allows to identify and introduce into the adjustment all detected nodes. Results for data-sets from different cameras available on the Web and comparison with other accessible algorithms indicate that this fully automatic approach performs very well, at least with images typically acquired for calibration purposes (substantial image portions occupied by the chess-board pattern, no excessive irrelevant image detail).
Language: English
Citation: Douskos, V., Kalisperakis, I., Karras, I. and Petsa, I. (2008). Fully automatic camera calibration using regular planar patterns. International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol. XXXVII, Part B5, pp. 21-26. Available from: http://portal.survey.ntua.gr/main/labs/photo/staff/gkarras/Karras_ISPRS_2008..pdf.
Conference: International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Access scheme: Publicly accessible
License: Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες
URI: http://hdl.handle.net/11400/5056
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