調(diào)制傳遞函數(shù)測(cè)試儀的自動(dòng)調(diào)焦技術(shù)研究.pdf

1、南京理工大學(xué)碩士學(xué)位論文調(diào)制傳遞函數(shù)測(cè)試儀的自動(dòng)調(diào)焦技術(shù)研究姓名：孫文申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：物理電子學(xué)指導(dǎo)教師：富容國20090530AbstractMan砌focusingrequiresthattheoperatorshaveprofessionalexpertiseanddoc啪bersomeoperationItalwaysbringserrorswitheyeballingofthehumaneyesWiththedevel

2、opmentofautomationandintellectualizationofthedigitalimageprocessing，whetherwecandoautomaticfocusing，collectandanalysetheimagesatthefocusquicklyandefficientlyisbecomingmoreandmoreimportantThethesisismainlybasedontheresear

3、choftheautomaticfocusingsystemofmodulationtransferfunction(MTF)testingdevicewithpointlightsourceThetestingdeviceisusedfor1enstestingItdeterminestheimagequalityandeliminatessubstandardlensTheautomaticfocusingsysteminthete

4、stingdeviceplaysanimportantrolebecausewhetherthetestingdevicecancollectexactimagesonfocusisrelatedtotheprecisionoftheMTFvalueAndtheMTFvalueisanimportantparameterofthelensThetllesisintroducesthebasicprinciplesofautomaticf

5、ocusingandanalysesseveralfocusingcriterionfunctions，especiallythefocusingcriterionfunctionusingthefrequencydomainmethodItchoosestheFouriertransformtocalculateMTFforthefocusingcriterionfunctionanddevisesapracticalalgorith

6、mforautomaticfocusingThethesisrebuildsthehardwarepartoftheoriginalequipmentoftheautomaticfocusingsvstemwithamillionpixelCCDcameratoobtainbetterimagesThepulsegeneratorofthestepmotorhaSalsobeenchangedSOthestepmotorCanbeeas

7、ilycontrolledbyordinarypersonalcomputers，notonlytheindustrialcontrolcomputersThethesisalsodesignsafriendlysoftwareinterfacefortheautomaticfocusingsystemoftheMTFtestingdeviceThesystemCanbecontrolledbythecomputerandbeopera

8、tedeasilyIthasgreatlyimprovestheefficiencyandaccuracyofthetestingAtlaustthethesissumsuptheprojectandputsforwardtheshortcomingoftheautomaticfocusingsystemandgivesthedevelopmenttendencyofthefutureworkKeywords：modulationtra