简介:WorkhasbeendonewithextendingtheusefulimaginganddetectionrageofCCD.ThiswasaccomplishedthroughdirectopticalcouplingandbondingofimageintensifierstotheCCD.IthasbeenshownthattheusefulrangeofaCCDmaybeextendedtwoordersofmagnitudeusingthesetechniquesincouplingamicrochannelplateimageintensifiertotheCCDarray.AlloftheseworksweredonewithpresentlyavailableCCDmadebyChina
简介:摘要 由于矩阵的初等变换和初等矩阵都有“初等”二字,所以非常容易将二者混为一谈.此文的目的在于解释这两个概念的区别,同时也介绍它们的关系.在对矩阵进行运算时,我们可对其进行类似于行列式的行(列)变换或数乘运算等,即矩阵的初等变换.为了搞清楚变换后的矩阵所具有的特性,也为了说明矩阵的初等变换的意义,我们引入初等矩阵的概念.其实初等矩阵就是单位矩阵经矩阵的初等变换后所得的矩阵.具体内容见下文简述.
简介:WiththehelpofCCDimages,therealizationofhighprecisionpo-sitioningandmeasurementhasbecomethebasicstandardformachinevisionandrealtimephotogrammetrysystems.However,deformationandothersortsofdegradationoccurringduringtransmissionaremajorlimitingfactorsofthepreci-sionattainablewithmostcurrentCCDcamerasandframegrabbers.SoapreciseradiometricandgeometrictransmissionofimagesfromCCDsensortomemoryisafundamentalaspectofCCDcameracalibration.Thegeometriccalibrationsystem,whichusessomeimageprocessingalgorithmsoftheCCDcamerabasedonthere-searchedanddevelopedsystemisdiscussed.Thereliabilityandvalidityarealsodiscussed.TheexperimentalresultsforthecalibrationoftheCCDarraywillbetakenasanimportantqualityindexforCCDevaluation.
简介:InordertoevaluatetheimagingqualityofCCDcamerasfullyandrapidly,theminimumresolvablecontrast(MRC)ispresentedinthispaperandthesystemofmeasuringMRCisconstructedaswell,inwhichtwointegratingspheresareproposedtoilluminatetwosidesofthetargetrespectively.Thevariablecontrastcanbeobtainedbyregulatingtheluminanceofintegratingspheres.Experimentalresultsindicatethattheerrorofmeasuringluminanceiswithin±0.3cd/m2,MRCriseswiththeincreaseofthespatialfrequency.TheexperimentalresultsshowthatthemethodproposedisaneffectiveapproachtoevaluatetheimagingqualityofCCDcameras.