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%***********************提取块坐标为K1,K2的图像块************************* 
function [partimage]=qukuai(lastimage1,k1,k2,B)  %partimage块图像，B原图分的快数************* 
      temp=lastimage1; 
      M=length(temp); 
      temp1=1; 
      temp2=1; 
      m1=k1-1; 
      m2=k2-1; 
    for i=(1+M/B*m1):(M/B+M/B*m1) 
       for j=(1+M/B*m2):(M/B+M/B*m2) 
           if temp2==M/B+1 
               temp1=temp1+1; 
               temp2=1; 
           end 
              partimage(temp1,temp2)=temp(i,j); 
               temp2=temp2+1; 
           end 
    end