Take images from webcam in every second

Hello everyone,

I am trying to take 1000 images exactly in 1000 seconds, but my attached code can take just 870 photos in 1000s, which is wrong.

There must be some problem with the code. Can some one help please.

Best

clear all;
close all;
clc;
w = webcam;
t0 = clock;
tic
while etime(clock, t0) < 1000
    img = w.snapshot;
    file_name_save= sprintf('%f.png',toc);  
    imwrite(img,file_name_save)
    pause(0.5)
end
 toc
clear camObject;

Answer 1

[Max Heimann]

How are you keeping track of the 1 second intervals?

Maybe the process of taking the image and storing it takes longer than .5 and then the code pauses for another .5 seconds resulting in too few images.

Try calculating the pause time dynamically.

w = webcam;
t0 = clock;
secondsPassed = 0;
while etime(clock, t0) < 1000
    secondsPassed = secondsPassed + 1;
    img = w.snapshot;
    file_name_save= sprintf('%f.png',toc);  
    imwrite(img,file_name_save)
    % calculate the remaining time until the next image shall be taken.
    time2wait = secondsPassed -  etime(clock,t0);
    pause(time2wait)
end
clear camObject;