Motionless active depth from defocus system using smart optics for camera autofocus applications

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dc.contributor.authorAmin, M. Junaid
dc.contributor.authorRiza, Nabeel A.
dc.date.accessioned2020-06-02T12:51:38Z
dc.date.available2020-06-02T12:51:38Z
dc.date.issued2016-04-29
dc.description.abstractThis paper describes a motionless active Depth from Defocus (DFD) system design suited for long working range camera autofocus applications. The design consists of an active illumination module that projects a scene illuminating coherent conditioned optical radiation pattern which maintains its sharpness over multiple axial distances allowing an increased DFD working distance range. The imager module of the system responsible for the actual DFD operation deploys an electronically controlled variable focus lens (ECVFL) as a smart optic to enable a motionless imager design capable of effective DFD operation. An experimental demonstration is conducted in the laboratory which compares the effectiveness of the coherent conditioned radiation module versus a conventional incoherent active light source, and demonstrates the applicability of the presented motionless DFD imager design. The fast response and no-moving-parts features of the DFD imager design are especially suited for camera scenarios where mechanical motion of lenses to achieve autofocus action is challenging, for example, in the tiny camera housings in smartphones and tablets. Applications for the proposed system include autofocus in modern day digital cameras.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid98960Nen
dc.identifier.citationAmin, M. J. and Riza, N. A. (2016) 'Motionless active depth from defocus system using smart optics for camera autofocus applications', Proceedings of SPIE, 9896, Optics, Photonics and Digital Technologies for Imaging Applications IV, 98960N, SPIE Photonics Europe, 2016, Brussels, Belgium, 29 April. doi: 10.1117/12.2227753en
dc.identifier.doi10.1117/12.2227753en
dc.identifier.eissn1996-756X
dc.identifier.endpage10en
dc.identifier.issn0277-786X
dc.identifier.journaltitleProceedings of SPIEen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/10107
dc.identifier.volume9896en
dc.language.isoenen
dc.publisherSociety of Photo-Optical Instrumentation Engineers (SPIE)en
dc.rights© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.en
dc.subjectDepth from defocusen
dc.subjectComputational imagingen
dc.subjectCoherent radiationen
dc.subjectCameras Imaging systemsen
dc.subjectImaging systemsen
dc.subjectProjection systemsen
dc.subjectDistance measurementen
dc.subjectImage processingen
dc.subjectOptical sensorsen
dc.titleMotionless active depth from defocus system using smart optics for camera autofocus applicationsen
dc.typeConference itemen
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