% compute the background imageIm0 = double(imread('ball00000100.jpg','jpg'));Im1 = double(imread('ball00000101.jpg','jpg'));Im2 = double(imread('ball00000102.jpg','jpg'));Im3 = double(imread('ball00000103.jpg','jpg'));Im4 = double(imread('ball00000104.jpg','jpg'));Imback = (Im0 + Im1 + Im2 + Im3 + Im4)/5;[MR,MC,Dim] = size(Imback);% loop over all imagesfig1=1;fig2=2;fig15=15;fig3=3;fig4=4;for i = 1 : 60  % load image  if i < 11    Im = (imread(['ball0000010',int2str(i-1), '.jpg'],'jpg'));   else    Im = (imread(['ball000001',int2str(i-1), '.jpg'],'jpg'));   end  if fig1 > 0    figure(fig1)    clf    imshow(Im)  end  Imwork = double(Im);  %extract ball  [cc(i),cr(i),radius,flag]=extractball(Imwork,Imback,fig1,fig2,fig3,fig15,i);  if flag==0    continue  end  if fig1 > 0    figure(fig1)    hold on    for c = -0.97*radius: radius/20 : 0.97*radius      r = sqrt(radius^2-c^2);      plot(cc(i)+c,cr(i)+r,'g.')      plot(cc(i)+c,cr(i)-r,'g.')    end    %eval(['saveas(gcf,''TRACK/trk',int2str(i-1),'.jpg'',''jpg'')']);    end      pause(0.3)end% show positionsif fig4 > 0  figure(fig4)  hold on  clf  plot(cc,'r*')  plot(cr,'g*')end