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

2013 9 11
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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 :)

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Jeff E
Jeff E 2013-9-11

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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.

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Lloyd
Lloyd 2013-9-11
thank you for replying Sir Jeff EA, I tried your code but it's stuck at image_1.jpg and it's overwriting it. :(
Jeff E
Jeff E 2013-9-11
Sounds like you're calling this block of code every time you want to take a snapshot. With my solution, and ImageAnalyst's below, you'll need to figure out a way to increment the counter variable.
Or use a timestamp.
Lloyd
Lloyd 2013-9-11
yes, that's what I'm trying to say. hehe anyway, thank you for helping me Sir Jeff EA :)
Lloyd
Lloyd 2013-9-11
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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Image Analyst
Image Analyst 2013-9-11

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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.

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Lloyd
Lloyd 2013-9-11
I can't seem to make it work Sir/Ma'am Image Analyst. I just need a simple 1st hit the pushbutton and 1 image1.jpg, 2nd hit and image2.jpg....
I'm sort of troubled with the sequentially numbered process and sequence processing with the directory.
I used your code:
frameCounter = 1; %initialize filename increment vid = videoinput('winvideo',2); set(vid, 'ReturnedColorSpace', 'RGB'); img = getsnapshot(vid); imshow(img); baseFileName = sprintf('Frame %d.jpg', frameCounter); fullFileName = fullfile('C:\Users\Sony Vaio\Documents\Task\0.1 Systems\System 1 - edited\Appendix\images', baseFileName); imwrite(img, fullFileName); frameCounter = frameCounter + 1;
It's stuck too at Frame1 and keeps on overwriting Frame1 :(
I'm still new and learning Sir/Ma'am. I'm sorry for troubling you..if ever I am :(
Lloyd
Lloyd 2013-9-11
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 2013-9-12
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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