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dc.contributor.authorHahne, Christopheren
dc.contributor.authorAggoun, Amaren
dc.contributor.authorVelisavljević, Vladanen
dc.contributor.authorFiebig, Susanneen
dc.contributor.authorPesch, Matthiasen
dc.date.accessioned2017-01-30T11:57:39Z
dc.date.available2017-01-30T11:57:39Z
dc.date.issued2016-09-08
dc.identifier.citationHahne C., Aggoun A., Velisavljevic V., Fiebig S., Pesch M. (2016) 'Refocusing distance of a standard plenoptic camera', Optics Express, 24 (19), pp.21521-21540.en
dc.identifier.issn1094-4087
dc.identifier.issn1094-4087
dc.identifier.doi10.1364/OE.24.021521
dc.identifier.urihttp://hdl.handle.net/10547/622011
dc.description.abstractRecent developments in computational photography enabled variation of the optical focus of a plenoptic camera after image exposure, also known as refocusing. Existing ray models in the field simplify the camera's complexity for the purpose of image and depth map enhancement, but fail to satisfyingly predict the distance to which a photograph is refocused. By treating a pair of light rays as a system of linear functions, it will be shown in this paper that its solution yields an intersection indicating the distance to a refocused object plane. Experimental work is conducted with different lenses and focus settings while comparing distance estimates with a stack of refocused photographs for which a blur metric has been devised. Quantitative assessments over a 24 m distance range suggest that predictions deviate by less than 0.35 % in comparison to an optical design software. The proposed refocusing estimator assists in predicting object distances just as in the prototyping stage of plenoptic cameras and will be an essential feature in applications demanding high precision in synthetic focus or where depth map recovery is done by analyzing a stack of refocused photographs.
dc.language.isoenen
dc.publisherOSA - The Optical Societyen
dc.relation.urlhttps://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-19-21521en
dc.rightsGreen - can archive pre-print and post-print or publisher's version/PDF
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectlens system designen
dc.subjectphotographyen
dc.subjectimage reconstruction techniquesen
dc.subjectcomputational imagingen
dc.titleRefocusing distance of a standard plenoptic cameraen
dc.typeArticleen
dc.contributor.departmentUniversity of Bedfordshireen
dc.contributor.departmentARRI Cine Techniken
dc.identifier.journalOptics Expressen
dc.date.updated2017-01-30T11:31:06Z
html.description.abstractRecent developments in computational photography enabled variation of the optical focus of a plenoptic camera after image exposure, also known as refocusing. Existing ray models in the field simplify the camera's complexity for the purpose of image and depth map enhancement, but fail to satisfyingly predict the distance to which a photograph is refocused. By treating a pair of light rays as a system of linear functions, it will be shown in this paper that its solution yields an intersection indicating the distance to a refocused object plane. Experimental work is conducted with different lenses and focus settings while comparing distance estimates with a stack of refocused photographs for which a blur metric has been devised. Quantitative assessments over a 24 m distance range suggest that predictions deviate by less than 0.35 % in comparison to an optical design software. The proposed refocusing estimator assists in predicting object distances just as in the prototyping stage of plenoptic cameras and will be an essential feature in applications demanding high precision in synthetic focus or where depth map recovery is done by analyzing a stack of refocused photographs.


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