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dc.contributor.authorWu, Chih-Jenen_US
dc.contributor.authorTsai, Wen-Hsiangen_US
dc.date.accessioned2014-12-08T15:09:04Z-
dc.date.available2014-12-08T15:09:04Z-
dc.date.issued2009-08-01en_US
dc.identifier.issn0091-3286en_US
dc.identifier.urihttp://dx.doi.org/10.1117/1.3204238en_US
dc.identifier.urihttp://hdl.handle.net/11536/6911-
dc.description.abstractA method for solving the problem of unwarping a distorted omni-image taken by a lateral-direction misaligned omni-camera with its optical axis incoincident with its mirror axis is proposed. The method does not conduct camera calibration and is based on a new concept of two-stage image mapping from the real-world space to the distorted image space. The first stage is conducted in the camera manufacturing process and includes the generation of a pano-mapping function for mapping the real-world space to an undistorted image taken by an omni-camera with its optical and mirror axes being coincident. The second stage is conducted in an in-field environment when the omni-camera becomes lateral-direction misaligned and includes the generation of a distortion-mapping function that maps undistorted image pixels to distorted ones and the generation of a misalignment adjustment table that combines the pano-mapping and distortion-mapping functions to map the real-world space to the distorted image space. The distortion mapping function is generated by a new technique of curved quadrilateral morphing using quadratic pattern classifiers. The misalignment adjustment table is last used to unwarp distorted images conveniently by table lookup. Experimental results using simulated and real-image data show the feasibility of the proposed method. (C) 2009 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3204238]en_US
dc.language.isoen_USen_US
dc.subjectimage unwarpingen_US
dc.subjectomni-imageen_US
dc.subjectomni-cameraen_US
dc.subjectcamera calibrationen_US
dc.subjectcamera misalignmenten_US
dc.subjectcurved quadrilateral morphingen_US
dc.subjectquadratic classifieren_US
dc.titleUnwarping of images taken by misaligned omnicameras without camera calibration by curved quadrilateral morphing using quadratic pattern classifiersen_US
dc.typeArticleen_US
dc.identifier.doi10.1117/1.3204238en_US
dc.identifier.journalOPTICAL ENGINEERINGen_US
dc.citation.volume48en_US
dc.citation.issue8en_US
dc.citation.epageen_US
dc.contributor.department資訊工程學系zh_TW
dc.contributor.departmentDepartment of Computer Scienceen_US
dc.identifier.wosnumberWOS:000270596700024-
dc.citation.woscount1-
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