简介:摘要:伴随着时间的推移,我们国家的各个方面都发生了巨大的变化,而办公自动化则成为了一种被普遍运用于工作中的一种新的方法,它给我们的工作提供了很大的方便,也让我们的工作效率得到了很大的提高。运用计算机技术、通信技术、自动化技术,能够极大地减轻工作负担,并使其结构得到优化,这对于改善行政制度、提高行政效率有着非常重大的作用。通过办公自动化,增强了员工的协同工作能力,提升了他们在决策和达到公司目的的水平,并对办公自动化进行了深度学习,增强了对计算机技术在办公自动化领域的运用和理解。在未来,继续利用计算机技术提升工作效率,将会是一个重要的发展方向。
简介:Wepresentadigitalholographicmicroscopewhereinthesampleisilluminatedbystructuredlighttoenablethecaptureofadditionalobjectspatialfrequencies.ReconstructedimageswithincreasedspatialresolutionareobtainedbyseparatingandsynthesizingbandwidthsofdifferentfrequencyregionsintheFourierdomain.Thetheoreticalanalysisandexperimentalresultsarepresented.
简介:Byusingasphericalwaveasthereferencewave,werecordedthein-linephase-shiftingdigitalhologramofthe25thelementofChinesestandardNo.3resolutiontestpattern,andgavethecorrespondingnumericalreconstructedresults.Someproblemsconcerningwiththedigitalhologramrecordingandreconstructionofthediffractiveobjectatashortdistancearediscussed.Theexperimentalresultshowsthattheresolutionofthereconstructedimageisbetterthan10μm,whichisthelimitbyusingthisexperimentalarrangement.
简介:Basedonthepointspreadfunctionofholographicsystem,thelateralresolutionofdigitalholographicimagingsystemwithoutanypre-magnificationisstudied.Theexpressionofresolutionlimitationofholo-graphicimagingsystemisthuspresented.Weinvestigatethepossibilitiestoimprovethelateralresolution.Thesimpleexperimentalsetupwithanoff-axisarrangementisbuilt.ByusingaU.S.AirForce(USAF)testtargetasmicroscopicobject,therecordedhologramsarereconstructeddigitallybasedontheprincipleofFresneldiffraction.Thelateralresolutionof2.76μmwithoutanypre-magnifieationisdemonstratedexperimentally,whichmatchesthetheoreticalpredictionwell.
简介:Targetdynamicsareassumedtobeknowninmeasuringdigitalspeckledisplacement.Useismadeofasimplemeasurementequation,wheremeasurementnoiserepresentstheeffectofdisturbancesintroducedinmeasurementprocess.Fromtheseassumptions,Kalmanfiltercanbedesignedtoreducevarianceofmeasurementnoise.Anopticalandanalysissystemwassetup,bywhichobjectmotionwithconstantdisplacementandconstantvelocityisexperimentedwithtoverifyvalidityofKalmanfilteringtechniquesforreductionofmeasurementnoisevariance.
简介:Anintegratedmethodbasedonopticalanddigitalimageprocessingispresentedtosuppressspeckleindigitalholography.Aspatiallightmodulatorisadoptedtointroducerandomphasestotheilluminatingbeam.Multiplehologramsarereconstructedandsuperimposed,andtheintensityisaveragedtosmooththenoise.Theadaptivealgorithmbasedonthenonlocalmeansisdesignedtofurthersuppressthespeckle.Thepresentedmethodiscomparedwithothermethods.Theexperimentalresultsshowthatspecklereductionisimproved,andtheproposedmethodiseffectiveandfeasible.
简介:不同的散斑场会显示出不同的灰度分布特征,并对数字图像相关方法的计算结果有着重要影响。使用计算机模拟生成一系列单向拉伸图像和双向拉伸图像,并在生成的图像中添加噪声,从而获得一系列含噪声单向拉伸图像和含噪声双向拉伸图像。使用数字图像相关方法对无噪声图像和含噪声图像分别进行相关计算,并分析研究图像应变量与相关计算结果正确率间的关系,研究结果表明发现当图像的应变量在一定范围内时,数字图像相关方法计算结果的正确率较高。同时发现,当图像的应变量较小时,噪声对相关计算结果的影响较大,随着图像应变量的增大,噪声对相关计算结果的影响逐渐减小,当图像的应变量到达一定程度时,噪声对相关计算的影响就不明显了。