save snapshot image in a variable within a loop!!

Asked by Khaled Al-Faleh on 4 Apr 2017

Latest activity Commented on by Jan on 4 Apr 2017

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please need help in this why the data(i) variable in while loop give me an error here I want to take a picture after each 5 second and I need it continuous so I used while(1) ...

vid = videoinput('winvideo',1);
set(vid, 'FramesPerTrigger', Inf);
set(vid, 'ReturnedColorspace', 'rgb');
i = 0; 
while(1)
    data(i) = getsnapshot(vid);
    imshow(data(i));
    i=i+1;
    pause(5);
end

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Jan on 4 Apr 2017

You mention an error. Then please post the message. It is easier to suggest an improvement than to guess the problem.

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Answer by Image Analyst on 4 Apr 2017

Accepted Answer

Get rid of the (i) and have just data, or better yet, a more descriptive filename:

for f = 1 : 1000 % view and save 1000 frames then quit.
    thisFrame = getsnapshot(vid);
    imshow(thisFrame);
    drawnow;
    baseFileName = sprintf('Frame %3.3d.png', f);
    fullFileName = fullfile(folder, baseFileName);
    imwrite(thisFrame, fullFileName);
end

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Answer by Joseph Cheng on 4 Apr 2017

Edited by Joseph Cheng on 4 Apr 2017

from what i see get snapshot returns a NxMx(1 for mono 3 for color) and you're trying to stuff it into a 1x1. what you should try is i=1 for start as data(0) isn't how matlab works. and put data as data(:,:,i) for monochrome as you'll be putting a NxM into data's NxMx1 indexes. change the data() into a cell array if you want to store it as an rgb image.

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