[rongrihua]

ori_matrix = rand(5,5);
[m,n] = size(ori_matrix);
[xx,yy] = meshgrid(1:m,1:n);
[xi,yi] = meshgrid(1:1/5:m,1:1/5:n);
wanted_matrix = interp2(xx,yy,ori_matrix,xi,yi,'linear'); % 可选择你要的插值方法
size(wanted_matrix)