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Geometric model and assessment of a dual‐fisheye imaging system
Author(s) -
Campos Mariana Batista,
Tommaselli Antonio Maria Garcia,
Marcato Junior José,
Honkavaara Eija
Publication year - 2018
Publication title -
the photogrammetric record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 51
eISSN - 1477-9730
pISSN - 0031-868X
DOI - 10.1111/phor.12240
Subject(s) - equidistant , bundle adjustment , orientation (vector space) , rotation (mathematics) , calibration , photogrammetry , lens (geology) , computer vision , bundle , rotation matrix , artificial intelligence , distortion (music) , base (topology) , coordinate system , essential matrix , matrix (chemical analysis) , computer science , mathematics , geometry , optics , physics , mathematical analysis , amplifier , computer network , statistics , materials science , bandwidth (computing) , composite material , state transition matrix , symmetric matrix , eigenvalues and eigenvectors , quantum mechanics
This paper presents a technique for the calibration of a 360° dual imaging system (Ricoh Theta S) composed of two cameras with fisheye lenses specially mounted in a common structure. The experiments are based on calibration with a bundle adjustment using the equidistant fisheye lens model and relative orientation stability constraints, such as distance, base elements and rotation matrix between individual cameras’ coordinate systems. As a result, an equidistant mathematical model using the Conrady–Brown lens distortion model was shown to be suitable for estimating the interior and relative orientation parameters of the Ricoh Theta S. The main contribution presented in this work is a simultaneous bundle adjustment approach with stability constraints on base elements and rotation matrix angles, which achieved accuracies comparable with conventional photogrammetric calibration with perspective cameras.