搜索
350001Butterworth。。TP391.41A１６７3－4629(２００8)06－0032－05２００8—06—301972—。JA07220SJOURNALOFLONGYANUNIVERSITY２００812266December２００8Ｖｏｌ．２6Ｎｏ．61、、、、、、、、、。。Matlab。。[1]。。。。、。。。[2]。。2。[3]。fxyixyrxy。ixy———rxy———。fxyfxy=ixy·rxy11nfxy=1nixy+1nrxy(2)。32F{1nfxy}=F{1nixy}+F{1nrxy}Fuv=F{1nfxy}Iuv=F{1nixy}Ruv=F{1nrxy}Fuv=Iuv+Ruv3Iuv———Ruv———。Huv。Huv。HuvHuv1;Huv1。11Huv·Fuv=Huv·Iuv+Huv·Ruv4hfxy=F-1[Huv·Iuv]+F-1[Huv·Ruv](5)hixy=F-1[Huv·Iuv]hrxy=F-1[Huv·Ruv]5hfxy=hixy+hrxy6gxy=exphfxy=exphixy·exphrxy7i0xy=exphixyr0xy=exphrxygxy=i0xy·r0xy8gxyhixyhrxyi0xyr0xy[4]。1[5]。fixyfixy。fixyfrxy。33.1/。MallatSMallat、。。cA,cH,cV,cD。。。。3．2。。。[6]。。。N。A。。。3．3,。33。。--。[7]。。。。。“”。。。[8]。FFTFFT-1。2WTnIWT。3.4Hu,v2Hu,v1;Hu,v1。360°Hu,v。L1H1,。、。。3Huv。ncHj、cVj、cDjj=1,2,…,ncAncAn。ncAn。。cAn。cAn。4MATLAB。MATLAB:、。RGB。MATLAB(double)(Unit8Unit16)。doubleXm×n×3[01]64×m×n×3Pij:Xij1Xij2Xij3。Unit8Unit16X(m×n)×334[0,255][0,65,535]64×m×n×3Pij[Xi,j,l/Nb][Xi,j,2/Nb],[Xi,j,3/Nb〕(Unit8Nb=255Unit16,Nb=65535)[9]。RGBR、G、BR=X(:,:,1)G=X(:,:,2)B=X(:,:,3)RR、GG、BBY=zeorsm,n,3Y(:,:,1)=RRY(:,:,2)=GGY(:,:,3)=BB。N。5MATLAB4—7。Butterworth。。。67。。456*0.98925*2.61257*1.0028*3.0072535Fog-removingProcessingofImagethroughHomorphicFilteringBasedonWaveletsTransformationLINYingAbstractThisarticleuseshomomorphicfilteringtoremovethefog.Byimprovingthetraditionalhomomorphicfiltering,weintroduceanewspatial-frequencyanalysismethodbasedonwaveletswhichisappliedtohomomorphicfilteringtoenhancethecontrastofanimage.Inordertoattenuatethelowspatialfrequenciesandamplifythehighspatialfrequencies,thewaveletanalysiscoefficientsareprocessedbytheButterworthfilter.Sothelocalunevendistributionduetonon-uniformityoflightsourcecanbereducedandtheobjectfeaturecanbeemphasized.Experimentshaveshownthatthemethodperformswellinenhancingthelocalcontrastwhilemaintainingitsglobalappearance.KewwordshomomorphicfilteringwavelettransformationfogremovalButterworthfilteringimagecontrast6。。。。。。[1].[M].1995.[2].[J].20014531-533.[3].[M].200785-86.[4].[M].1990.[5].[J].1996113:195-199.[6].[M].1998.[7].[M].2006.[8].Matlab[M].2001.[9].MATLAB6.5[M].2003.〔〕36