'for loop' issue: computer becomes progressively slower as each loop is ran

Hello,

I'm running the following script:

video = input('type video name as string: \n')
 
v = VideoReader(video);
 
folder = 'X'
mkdir(folder); 
 
l = v.NumberOfFrames
coordinates = zeros(2,l);
 
for img = 1:l-24; 
    filename = strcat('frame', num2str(img), '.jpg');
    b = read(v, img); 
    imwrite(b,fullfile(folder, filename)); 
    imshow(b);
    hold on
    [x,y] = ginput(1); %mark head and body
    coordinates(1, img+1-1) = x(1,1); 
    coordinates(2, img+1-1) = y(1,1);
end
 
save('MFB50','coordinates')

After each loop is ran (after the coordinates of my mouse click are recorded), my computer becomes slower and slower. I'd appreciate it if anyone can help me figure out why this is happening.

Answer 1

[Walter Roberson]

You have hold on. All of those images are piling up on top of each other in the display.

[Arian Kolahi Sohrabi]

thank you