Need help to capture and save image at every 5 seconds from both camera?

Hello,

I wrote the following code - which can read 2 USB camera connected to my PC. Now i want to create a loop or function that will tell each camera to take a snapshot at every 10 seconds and save them in the disk. How do i do that?

clc; clear;
close all; objects = imaqfind %find video input objects in memory
delete(objects) %delete a video input object from memory

vid1 = videoinput('winvideo', 1, 'MJPG_1280x720');
vid2 = videoinput('winvideo', 3, 'RGB24_1824x1216');
%camera 1 - for force sensor beam
vid1.FramesPerTrigger = 1;
vid1.TriggerRepeat = inf;
triggerconfig(vid1, 'manual');
vid1.TimerFcn = 'trigger(vid1)';
vid1.TimerPeriod = 5;

%camera 2 - strain measurement
vid2.FramesPerTrigger = 1;
vid2.TriggerRepeat = inf;
triggerconfig(vid2, 'manual');
vid2.TimerFcn = 'trigger(vid1)';
vid2.TimerPeriod = 5;

%view the camera
preview(vid1);
preview(vid2);

snapshot1 = getsnapshot(vid1);
snapshot2 = getsnapshot(vid2);

Answer 1

[Rishik Ramena]

For continuous capture, you can use the getsnapshot function inside a loop with a pause function. For saving the snapshot to the disk you can use imwrite. Here's a sample snippet.

i = 1;
while true % run for indefinitely long time
    snapshot1 = getsnapshot(vid1);
    snapshot2 = getsnapshot(vid2);
    imwrite(snapshot1, ['camera1_' num2str(i) '.png']); %save the snapshots for camera1
    imwrite(snapshot2, ['camera2_' num2str(i) '.png']); %save the snapshots for camera2
    pause(10); % pause for 10 seconds
    i = i+1;
end

If you're worried about the timing overheads in these do have a look this example.

[M Faisal Riyad]

Thanks for the help.