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

Question

Lloyd 2013-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/86943-image1-jpg-image2-jpg-etc-how

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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Answer 1

Jeff E 2013-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/86943-image1-jpg-image2-jpg-etc-how#answer_96479

在 MATLAB Online 中打开

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 2013-9-11

yes, that's what I'm trying to say. hehe anyway, thank you for helping me Sir Jeff EA :)

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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Answer 2

Image Analyst 2013-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/86943-image1-jpg-image2-jpg-etc-how#answer_96483

在 MATLAB Online 中打开

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 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 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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