image1.jpg, image2.jpg.....etc how?

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Lloyd
Lloyd on 11 Sep 2013
I want to save images without overwriting them whenever I hit the pushbutton. Can you please help me how save images without overwriting the original? What I want to do is whenever I'll hit the pushbutton, It will generated 1 image at a time without deleting the original.
here's my simple code.
vid = videoinput('winvideo',1);
set(vid, 'ReturnedColorSpace', 'RGB');
img = getsnapshot(vid);
imshow(img);
imwrite(img,'C:\Users\Sony Vaio\Documents\Appendix\images\image.jpg');
thank you :)

Accepted Answer

Jeff E
Jeff E on 11 Sep 2013
counter = 1; %initialize filename increment
vid = videoinput('winvideo',1);
set(vid, 'ReturnedColorSpace', 'RGB');
img = getsnapshot(vid);
imshow(img);
savename = strcat('C:\Users\Sony Vaio\Documents\Appendix\images\image_' , num2str(counter) , '.jpg'); %this is where and what your image will be saved
imwrite(img, savename);
counter = counter +1; %counter should increment each time you push the button
Instead of using a counter, you could also use a timestamp, as from CLOCK or DATESTR.
  4 Comments
Lloyd
Lloyd on 11 Sep 2013
yes, that's what I'm trying to say. hehe anyway, thank you for helping me Sir Jeff EA :)
Lloyd
Lloyd on 11 Sep 2013
one more thing sir, Is it possible to loop the whole block of code? I can't find any solutions to put on "if (insert loop rofl)"

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More Answers (1)

Image Analyst
Image Analyst on 11 Sep 2013
Lloyd:
Use sprintf() to construct a unique filename based on a loop counter. See the FAQ for details: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F
baseFileName = sprintf('Frame %d.png', frameCounter);
fullFileName = fullfile(folder, baseFileName);
imwrite(img, fullFileName);
frameCounter = frameCounter + 1;
Put the above in a loop that keeps snapping and saving images until you stop it somehow.
  3 Comments
Lloyd
Lloyd on 11 Sep 2013
Sir/Ma'am Image Analyst,
I saw your answer somewhere here about the global continueSnapping;
can I use that to call the whole block of code to a loop?
btw: I wanted to Accept your answer too since your answer is identical to JEFF EA but I didn't know that only 1 answer is allowed to be accepted. I'm sorry :(
Image Analyst
Image Analyst on 12 Sep 2013
So it's not in a loop - it's in a pushbutton callback. So you can either make frameCounter global or persistent, or you can get a directory listing, figure out what the highest number so far is, and then increment it (which is the most complicated and longest method but probably the most robust and reliable.)

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