全息成像的研究(2)

2021-04-05 10:38

竖主堡塞全星堕堡箜堑塞一——

Abstract

Thisthesisaddressesthetheory,numericalcomputingandtechnologyofdynamicalholographydisplaybasedonholovideo(real—timedisplay).Itisimpossibletorealizedynamicandreal—timedisplayfortypicalopticalholographywheretherearetwoindependencecoursesofopticalholographicrecordingandopticalholographicdisplay.However,dynamicalholographicdisplayisinteractive3-Ddisplay.Ithasmanyapplications.TypicalComputerGeneratedHolography(CGH)andhologramsynthesisthatsimulatetypicallyopticalholographyneedtocomputeahuge2-Dholographicfringe,ortolosesome3-Djnformationandresolutiontoreducedata.Thefirstreal—timedisplayofholographicimageswasreportedin1990bytheMITSpatialImagingGroupButthisisstillaflopenproblembecauseviewangleofholographicimages,volumeandspeedoftransmitarelimited.

Thisthesiscoversthemethodsofcomputingholographyaswellastheprincipleofthe3-Dimagingbasedonthediffraction-specificapproach,thekeytopicsareencodinganddecodingoffringebasedoncomputer-generatedholography(CGH).Anewmethodofencodinganddecodingoffringeareproposedusingwavelettransformtoestablishanewtransformmodel.Itisfastandsimpletocomputebasisfringebyusingthewaveletpackage.Experimentalresultsshowtheobviousadvantageandrobustnessofourmethods.Inthisthesis,westudythealgorithmofholographicstereogramdisplaythatCanbeimplementedusingCGH.Wediscusstheimagingprocessthroughcapturingsequenceparallaximages,illuminatinghologrambyaplanewavecreatesthevolumeeffectintheobserver’Seyes.ThemethodofcompressingbandwidthoffringefunctionisproposedthatbasisfringecontainsdiscretespectrumwhichisbasedonHumanvisionforreal—timedisplay.wealsointroducediscussesthespatiallightmodulators(SLMs)basedOndisplaysystemofdigitalholographyandtheoryofnumericalreconstructionofdigitalholography.Asaexample,wereconstructphaseoflightwavefronttoperfectbeamreflectedbyanimperfectmirror.

Thetopicwehavetackledareasthefollowing,

(1)Numericalsimulationforlightpropagationandvisualizationoflight-fielddistributionofFresnaldiffractionandFraunhoferdiffractionwith

(2)Computationanddisplayofhologrambymethodofsimulation—anneal3


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