Only saving one iteration of the for loop is being saved to the file, but I need all the iterations to be saved to the file.

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Merrilee Thomas 2018-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/389824-only-saving-one-iteration-of-the-for-loop-is-being-saved-to-the-file-but-i-need-all-the-iterations

评论： Greg 2018-3-23

The code works well, however, only one iteration of my for loop is being saved into the tiff file. When I open the .tiff there are only 30 images. I am not sure if this error is because the for loop is overwriting the first 30 images every time it iterates, or if the way that I am saving my images, that when they save, the first thirty are being written over by the second iteration. Possibly I am using the wrong trigger event?

 Below is my code
 vid = videoinput('hamamatsu', 1, 'MONO16_BIN4x4_512x512_FastMode');
  src = getselectedsource(vid);
  %vid.FramesPerTrigger = 10;
  % TriggerRepeat is zero based and is always one
  % less than the number of triggers.
%vid.TriggerRepeat = 2;
src.ExposureTime = .3;
%when I want to take multiple images, wait awhile and then takee more
%images in the same file. 
for i = 1:2
    tic
    vid.FramesPerTrigger = 30;
    fprintf(obj, 'O 0 1'); %on
    preview(vid);
    %fprintf(obj, 'O 0 1'); %on
    start(vid),wait(vid);
    toc
       for l = 1:2
           fprintf(obj, 'O 0 0'); %off 
           pause (10);
       end;
end;
stoppreview(vid);
stop(vid);
alpha = input('What do you want to name you file? ','s');
x = getdata(vid);
filename = [alpha '.tif'];
for slnum = i : size(x, 4)
  if slnum == i; mode = 'overwrite'; else mode = 'append'; end
  imwrite( x(:,:,slnum), filename, 'writemode', mode);
end
closepreview(vid);
delete(vid); 
clear vid;