qukuai.m

把Arnold cat映射进行修改

%***********************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