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function y=ksw(t,mingrayvalue,maxgrayvalue,hist1,HT) 
    
    %¼ÆËã×î¼ÑÖ±·½Í¼ìØ£¨KSWìØ£© 
     
    Pt=0; 
    for i=mingrayvalue:t 
        Pt=Pt+hist1(i+1); 
    end 
     
    Ht=0; 
    for i=mingrayvalue:t 
        if hist1(i+1)==0 
           temp=0; 
        else 
           temp=-hist1(i+1)*log(hist1(i+1)); 
        end 
        Ht=Ht+temp; 
    end 
     
    if Pt==0 | Pt==1           %   or(Pt==0,Pt==1) 
        H=0; 
    else  
        H=log(Pt*(1-Pt))+Ht/Pt+(HT-Ht)/(1-Pt); 
    end 
     
    y=H;