Making normxcorr2 function efficient

MSP

2017 9 28

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Hello the problem I'm facing is that for calculations with large matrix, the normxcorr2 takes much time.So is there be any way of doing the function for a limited range.Pls see the code that I have attached.I want the function normxcorr2 to return only the highlighted part in the image(which is time efficient).

tmp1=magic(5)
  tmp2=magic(6)
  cnorm=normxcorr2(tmp1,tmp2)
  MinLagR = -2; MaxLagR =1; 
  MinLagC = -2; MaxLagC =2; 
    zerolagr=size(cnorm,1)-size(tmp2,1)+1;
    zerolagc=size(cnorm,2)-size(tmp2,2)+1;
    c=cnorm(zerolagr,zerolagc)
    cx=cnorm(zerolagr+MinLagR:zerolagr+MaxLagR,zerolagc+MinLagC:zerolagc+MaxLagC )