ADAPTIVE WEIGHTING of IMAGE OBSERVATIONS for SELF-CALIBRATION with FISHEYE IMAGES

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dc.contributor.authorCastanheiro, L. F. [UNESP]
dc.contributor.authorTommaselli, A. M.G. [UNESP]
dc.contributor.authorCampos, M. B.
dc.contributor.authorBerveglieri, A. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionFinnish Geospatial Research Institute FGI
dc.date.accessioned2022-04-29T08:33:06Z
dc.date.available2022-04-29T08:33:06Z
dc.date.issued2021-06-17
dc.description.abstractFisheye cameras have been widely used in photogrammetric applications, but conventional techniques must be adapted to consider specific features of fisheye images, such as nonuniform resolution in the images. This work presents experimental results of an adaptive weighting of the observation in a self-calibrating bundle adjustment to cope with the nonuniform resolution of fisheye images. GoPro Fusion and Ricoh Theta dual-fisheye systems were calibrated with bundle adjustment based on equisolid-angle projection model combined with Conrady-Brown distortion model. The image observations were weighted as a function of radial distance based on combining loss of resolution and blurring in fisheye images. The results were compared with a similar trial by considering the same standard deviation for all image observations. The use of adaptive weighting of image observations reduced the estimated standard deviation of unit weight by 30 % and 50 % with GoPro Fusion and Ricoh Theta images, respectively. The estimation of relative orientation parameters (ROPs) was also improved (∼50 %) when using adaptive weighting for image observations.en
dc.description.affiliationDepartment of Cartography São Paulo State University (UNESP) at Presidente Prudente
dc.description.affiliationDepartment of Remote Sensing and Photogrammetry Finnish Geospatial Research Institute FGI, Geodeetinrinne 2
dc.description.affiliationUnespDepartment of Cartography São Paulo State University (UNESP) at Presidente Prudente
dc.format.extent81-87
dc.identifierhttp://dx.doi.org/10.5194/isprs-annals-V-1-2021-81-2021
dc.identifier.citationISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, v. 5, n. 1, p. 81-87, 2021.
dc.identifier.doi10.5194/isprs-annals-V-1-2021-81-2021
dc.identifier.issn2194-9050
dc.identifier.issn2194-9042
dc.identifier.scopus2-s2.0-85115061520
dc.identifier.urihttp://hdl.handle.net/11449/229531
dc.language.isoeng
dc.relation.ispartofISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
dc.sourceScopus
dc.subject360° fisheye cameras
dc.subjectHyperhemispherical lenses
dc.subjectObservations weighting
dc.subjectStability constraints
dc.titleADAPTIVE WEIGHTING of IMAGE OBSERVATIONS for SELF-CALIBRATION with FISHEYE IMAGESen
dc.typeTrabalho apresentado em evento
unesp.departmentCartografia - FCTpt

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Presidente Prudente - FCT - Faculdade de Ciências e Tecnologia