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:1001-4217(2010)02-0051-06Matlab1,2,3(1.703,150036;2.,200092;3.,150080):,,Matlab.,,,,.,,-0.7%~+1.2%,.:;;;:TP391.41:A0,,,.,.,:,,,,;[1],,.,,,,,,,,;,,,,,.,,.:2009-11-03:(1984-),,,.:.E-mail:stone_fkk@163.com20105()252May2010JournalofShantouUniversity(NaturalScience)Vol.25No.211.1RGB、RGB,、、3,M×N×3,M、N、.,.unit8,[0,256].,0,,255,,.[2].1.2[3],,,,,,.[3],,,,.1.3,,.,[4],,,[5-6].2,,,、、(),,.Y,Y,.(RGB)Matlab,rgb2gray.Matlab,,.,,,.(),,,,..,,,.,.,(),.()2552,,(),,,.,,0,.,.,XY,.,,,,.33.11.,[7],,0.02“”,1(a).,2:Matlab1t/s(e)1.60-1.6d/μm012341.60-1.6d/μm01234t/s(d)m(c)2.521.510.50I×1040501001502002501.60-1.6d/μm01234t/s(a)(b)d/μmt/s1.60-1.60123453,1(b).,1(c),255,253,.1(c),245,、245,,,245,200,1(d),.,XY,1(e),.3.22,y=sinx+25cos(5x)+ex/2+2002(a),,.,2(b),.3.5~4,210~235,,2(c).Y,,.,,()252l/mm235230225220215210t/s3.53.63.73.83.94。(c)σ/%0.0150.010.0050-0.0050.01-0.015t/s0246810(d)l/mm400350300250200150t/s0246810(a)l/mm400350300250200150t/s0246810(b)54.σ,σ=(Y-Y)/(Y-Y)×100%,2(d).-0.7%~+1.2%,0.0018,0.18%;0.0084,..,.4,.1)Matlab,.2),,,.3),,,,Y.4),,-0.7%~+1.2%,..:[1].[J].,2009(4):73-77.[2],.MATLAB———[M].:,2000:21-22.[3],.Otsu[J].,2008(29):2844-2845.[4],.[M].:,1997:49-54.[5],.[J].,2009(38):333-336.[6],,.MATLAB[J].,2008(13):18-20.[7]WangY,ZhangWJ.Stochasticvibrationmodelofgeartransmissionsystemsconsideringspeed-dependentrandomerrors[J].NonlinearDynamics,1998(17):187-203.2:Matlabiimaxmin(63)55MethodofDataExtractingofImageCurveBasedonMatlabFUKun-kun1,ZHENGBai-lin2,LIXin3(1.HarbinInstituteof703,Harbin150036,Heilongjiang,China;2.SchoolofAerospaceEngineeringandAppliedMechanics,TongjiUniversity,Shanghai200092,China;3.CollegeofMeasurement-ControlTech&CommunicationsEngineering,HarbinUniversityofScienceandTechnology,Harbin150080,Heilongjiang,China)Abstract:AmethodofdataextractingthroughMatlabprogrammingisintroduced.First,theimagewasdenoisedbyfilter,andoptimalthresholdvaluewasusedtoconvertedgrayscaleimagetobinaryimage.Then,scalingfactorwasobtainedbydeterminingthelocationofframeofaxisingrayscalematrix.Allfeaturesexceptcurvesweresettowhitecolor,sothatthedataofcurvewereeasilyrecognizedandconvertedtorealcoordinate.Themethodisusedtoextracttwotypesofcurveofpictureandtheresultsshowthatdataobtainedviathismethodareprecise.Therelativeerrorisbetween-0.7%to1.2%andtheprecisionmainlydependsonthenumberofpixelpoint.Keywords:dataextractingofcurve;pixel;thresholdvalue;binaryimage(55)DesignofDemodulationandDynamicFilterforUltrasoundEchoSignalBasedonGC5016XIEBin1,LINYi-wen2,ZHOUGui-rong1(1.InstituteofUltrasoundInstruments,UltrasoundInstrumentsCorporation,Shantou515041,Guangdong,China;2.DepartmentofElectronicsandInformation,ShantouUniversity,Shantou515063,Guangdong,China)Abstract:Amethodisdesignedtodemodulateandfiltertheultrasoundechosignals,basedonthedigitalup/downconverterGC5016.Thesignalprocessingofdynamicalfil-teringisimplementedtogetherwiththedemodulationbyGC5016,whichisusuallyusedformodulationanddemodulation.ItdecreasestheusageofmultiplierresourcesinFPGA.Keywords:GC5016;ultrasoundechosignal;demodulation;dynamicfilter;signalpro-cessing2:GC501663
本文标题:基于Matlab的图像曲线数据提取方法-付昆昆
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