一种基于直方图均衡化改进的图像增强算法

15230420078;;TP751A1001-8379(2007)04-0152-03AMETHODIMPROVEDONHISTOGRAMEQUALIZATIONFORIMAGEENHANCEMENTCHEGuo-quanQINJunCHENYu-lin(Dept.ofSurveyingEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:Thedisadvantageoftraditionalhistogramequalizationisanalyzedinthispaperandanewimprovedmethodisputforwardbasedonprobabilityofhistogramequalization.Itisprovedthatthismethodgivesabetterconversion,notonlycanmaketheresultagreatprogressbutalsocanbeasfastandautomaticasthetraditionalone.Keywords:histogramequalization;imageenhancement;algorithmip()1loglogiiiiIipppp==−()1100lognniiiiHIipp−−====−∑∑01211nppppn−===⋅⋅⋅==30420078153[](,)(,)gxyTfxy=(,)fxy(,)gxyTfTstfg(,)xy()tTs=()Ts01sL≤≤−01sL≤≤−0()1TsL≤≤−1()sTt−=01tL≤≤−[]0,1L−sts00()()kkikksiiintTspsn=====∑∑0,1,2,...,1kL=−kt()1int1kkktLtL+⎡⎤=−+⎣⎦0,1,2,...,1kL=−kn()kkptnn=[],MNktkt′k[],MNk[]0,1kMNL≤≤≤−[],MNkh()int[](1)NMhk−=+it′ktMkh′′=+×()int[](1)kNMtMkk−′′=+×+ks0,1,2,...,1kL=−kn()kkptnn=()int[](1)kNMtMkk−′′=+×+()kkptnn=0255∼154304200780M=255N=