Btukfyl

I need help with my script, i am trying to find a way to update the template dimension.
After the template is defined for the first time, in each successive frame the script will correlate the template with a search window, if the max correlation is in a certain range, the template will be updated using the coordinate of the max correlation point as center. The problem states when the intruder changes its size, how can I allow the script to follow the size of the intruder?

Following is the code part:

...                

[TWr TWc] = size(templatewindow);

[Tr Tc] = size(template);

corr_temp = normxcorr2(template,templatewindow);

corr_temp = imcrop(corr_temp,[Tc Tr TWc TWr]);

max_corr_temp(i) = max(max(corr_temp));

[tr tc tv] = find(corr_temp == max(max(corr_temp)));

if  (max_corr_temp(i) < 0.80) && (max_corr_temp(i) > 0.725)

lim_r = tr+Tr;

lim_c = tc+Tc;

nometemplate=['template',num2str(i_firm)];

    if lim_r > TWr

        lim_r = TWr;

    end

    if lim_c> TWc

        lim_c = TWc;

    end

    template = templatewindow(tr:lim_r,tc:lim_c);

    assignin('base',(nometemplate),template);

...

In this way the dimension of the template doesn't follow the dimension of the intruder. Any suggestion?