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1、Lecture18:Light-FieldCameras(PlenopticCameras)KayvonFatahalianCMU15-869:GraphicsandImagingArchitectures(Fall2011)Continuingtheme:computationalphotography▪Camerascapturelight,extensiveprocessingproducesdesiredimage▪Today:-Capturinglight!elds(notjustphotographs)withahandheldcamera
2、-ImplicationsforphotographyKayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011)Recall:light-!eldLight!eldisa4Dfunction(representslightinfreespace:noocclusion)[Imagecredit:LevoyandHanrahan96]Two-planeparameterization:Lightraydescribedbyconnectingpointon(u,v)planew
3、ithpointon(s,t)planeMoregeneral:plenopticfunction(AdelsonandBergen1991)KayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011)Light!eldinsideacameraRayspaceplotScenefocalplaneULensaperture:(U,V)XPixelP1PixelP2Sensorplane:(X,Y)PixelP1PixelP2KayvonFatahalian,Graphicsa
4、ndImagingArchitectures(CMU15-869,Fall2011)DecreaseaperturesizeRayspaceplotScenefocalplaneULensaperture:(U,V)XPixelP1PixelP2Sensorplane:(X,Y)PixelP1PixelP2KayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011)DefocusRayspaceplotScenefocalplaneULensaperture:(U,V)XPix
5、elP1PixelP2Sensorplane:(X,Y)PixelP1PixelP2CircleofconfusionKayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011)DefocusRayspaceplotScenefocalplaneULensaperture:(U,V)XPixelP1PixelP2Sensorplane:(X,Y)KayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011
6、)StanfordCameraArrayWilburnetal.2005640x480tightlysynchronized,repositionablecamerasCustomprocessingboardpercameraTetheredtoPCsforadditionalprocessing/storageHostPCwithdiskarrayKayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011)Capturedlight!eldKayvonFatahalian,
7、GraphicsandImagingArchitectures(CMU15-869,Fall2011)SyntheticapertureSimulateimageformationbyvirtualcamerawithlargeapertureShiftandaddimagesWilburnetal.2005KayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011)RefocusedsyntheticapertureimageKayvonFatahalian,Graphics
8、andImagingArchitectures(CMU15-869,Fall2011)Plen
