Please use this identifier to cite or link to this item: http://hdl.handle.net/11400/4983
Title: Modeling distortion of super-wideangle lenses for architectural and archaeological applications
Authors: Καρράς, Γιώργος
Μουντράκης, Γεώργιος
Πατιάς, Πέτρος
Πέτσα, Έλλη
Item type: Conference publication
Conference Item Type: Full Paper
Keywords: Lens Distortion;Super-Wide-Angle Lenses;Photogrammetry in architecture;Resampling;Φακός παραμόρφωσης;Ευρυγώνιος φακός;Φωτογραμμετρία στην αρχιτεκτονική
Subjects: Technology
Photogrammetry
Τεχνολογία
Φωτογραμμετρία
Issue Date: 28-Jan-2015
1998
Date of availability: 28-Jan-2015
Abstract: Mapping of architectural and archaeological objects often encounters limitations in imaging distances (interiors, narrow streets, excavations), usually tackled via large numbers of images or special camera platforms This, however, seriously contradicts the benefits of simple, low-cost photogrammetric procedures. In these cases, furthermore, the use of digital cameras with the currently limited area of sensitive sensors may also be impracticable. In this context, the employment of super-wide-angle lenses (e. g. of 14, 17 or 18 mm focal lengths for 35 mm cameras) appears as a possible remedy; these, however, suffer from heavy distortions. This paper presents a first study of two different 17 mm lenses commonly available in the market (RMC Tokina and SP Tamron on Nikon cameras). In order to assess their photogrammetric po-tential, the efficiency of the conventional model for radial symmetric lens distortion has been tested. Partial calibration was performed using photography of straight lines easily found in urban environments. Overall precisions of line fitting, initially 4.2 and 6.3 pixels, rose after correcting distortion to 1.3 and 1.5 pixels, respectively; thus, the main cause of de-viations seems to have been removed. Repeatability of calibration, on the other hand, is also regarded as satisfactory (presence of decentering distortion was difficult to establish). Digital image transformation, also performed here, results in resampled imagery essentially freed from lens distortion and suitable for common digital photogrammetric software.
Language: English
Citation: Karras G., Mountrakis G., Patias P. and Petsa E. (1998). Modeling distortion of super-wideangle lenses for architectural and archaeological applications. International Archives of Photogrammetry & Remote Sensing, 32(5), pp. 570-573. Available from: http://portal.survey.ntua.gr/main/labs/photo/staff/gkarras/Karras_isprs_Com5_1998.pdf
Conference: International Archives of Photogrammetry & Remote Sensing.
Access scheme: Publicly accessible
License: Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες
URI: http://hdl.handle.net/11400/4983
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