基于CCD和MATLAB的等照度线绘制方法

20138244ZHAOMINGGONGCHENGXUEBAOAug．2013Vol.24No.4CCDMATLAB11221.2150052.215005CCDMATLABRGBCCD。CCDMATLABTP391.7ADOI10.3969j.issn.1004-440X.2013.04.007MethodofDrawingIsophotesBasedontheCCDandMATLABWangJun1ZhuJihong1FengXing2XiaoJun21．SuzhouUrbanLightingAdministrationSuzhou215005China2．SuzhouUrbanLightingEngineeringCorporationSuzhou215005ChinaAbstractInresponsetotheproblemthattheconventionalisophotedrawingistime-consumingandlaboriousthispaperproposesamethodofusingCCDimagingandMATLABsoftwaretodrawtheiso-phot．AccordingtothesensitivityofthehumaneyestothethreeprimarycolorsittransformstheRGBimageintograyimageinproportion．BasedonthelinearformulawhichisfittedoutbyleastsquaremethodbetweenimagegrayvalueandtheactualilluminationvalueitcalibratesimagegrayvaluethusplottingisophoteaccuratelywhichconfirmsthefeasibilityofusingCCDimagingtodrawisophote．KeywordsCCDMATLABleastsquaremethodisophotesilluminanceroadlighting1。。30240CCDCCD1。MATLAB。244CCDMATLAB412MATLABMATLABMatrixLaboratory、、、、、。、、、2MATLABMATLAB。MATLAB。3CCD3。4E=πτ4f2m1－()fl2L11ELτflfmlf1－fl≈11E=πτ4f2mL22πτ/4f2m。15E1=πLsin2β2cosγ31Fig.1Thegraphofdiffuseroadwithcamera3E1βγ32E=E1τ4f2msin2β2cosγ4βγ。44.1120WLED#042400W#040。。4.2RGBR=G=B0～255。4220138、、、Gray=0.299×R+0.587×G+0.114×BRGBMATLABMATALBRGBa=imread'DSC08896.jpg'%b=rgb2graya%RGBe=doubleb%ave=meane%4.3MATLABj1=00.160%p=polyfitxy1%x、yr1=polyvalpx%xq=corrcoefyr1%k1=polyvalpj1%j1plotxy'or'j1k1'－b'%legend'''1'2%xlabel'X'ylabel'Y'%LED2E=1.1728×D+2.301555R2=0.9964LED。32LEDFig.2TheilluminationwithgraygraphofLEDlight3Fig.3TheilluminationwithgraygraphofsodiumlampE=2.0671×D+2.244866R2=0.9987。56。4.4MATLABcontourMATLABimresizeNearestNeighborMATLABcontoura=imread'DSC08931.jpg'%244CCDMATLAB43b=rgb2graya%RGBc=imresizeb0.005%d=doublec%p=correction1%zd=polyvalpd%sy=sized1sx=sized2%mi=minminzdma=maxmaxzd%mi2=floormima2=ceilma%qx=mi23ma2%3figurelaxlay=contourxyzdqx%clabellaxlay%colorbar%LED453lx45LED120WLED400W。4LEDFig.4TheisoluxgraphofLEDlamp5Fig.5Theisoluxgraphofsodiumlamp5CCDCCDCCDCCD。1．J．201122212～15．2．MATLABJ．2011272106～108．3．CCDJ．20068388～392．4．CCDJ．1999188～91．5．J．199922249～53．《》CNKI、、、。。。