Using images in a for loop

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Sneheet
Sneheet 2014-1-31
评论： Image Analyst 2014-2-1
I've split a video into frames and written them to my disk individually. Now I need to find the difference between 2 consecutive frames. How do I call those images in he loop? The images are saved as Frame 0001.png, Frame 0002.png....etc

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Walter Roberson
Walter Roberson 2014-1-31

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Image Analyst
Image Analyst 2014-1-31
I do that in my demo. Though I do the differencing as the frames are read in. In the latter half of the demo, after I've written out individual frames to individual files, I read in individual frames back in. You could of course switch the subtraction step to there if you want. See attachment (below in blue text).
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Shivaputra Narke
Shivaputra Narke 2014-2-1
Go to matlab help and search for imwrite. If you are new to Matlab you can use Matlab help.
Image Analyst
Image Analyst 2014-2-1
It's right there in the code. Take another look:
% Construct an output image file name.
outputBaseFileName = sprintf('Frame %4.4d.png', frame);
outputFullFileName = fullfile(outputFolder, outputBaseFileName);
% Extract the image with the text "burned into" it.
frameWithText = getframe(gca);
% frameWithText.cdata is the image with the text
% actually written into the pixel values.
% Write it out to disk.
imwrite(frameWithText.cdata, outputFullFileName, 'png');
You can make outputFolder whatever you want. For example I did this:
% Make up a special new output subfolder for all the separate
% movie frames that we're going to extract and save to disk.
% (Don't worry - windows can handle forward slashes in the folder name.)
folder = pwd; % Make it a subfolder of the folder where this m-file lives.
outputFolder = sprintf('%s/Movie Frames from %s', folder, baseFileName);
% Create the folder if it doesn't exist already.
if ~exist(outputFolder, 'dir')
mkdir(outputFolder);
end
But you could just replace that with your own folder:
outputFolder = 'd:\Narke\Images'; % Or whatever.
% Create the folder if it doesn't exist already.
if ~exist(outputFolder, 'dir')
mkdir(outputFolder);
end
If it's just certain frames, you can set outputFolder on a frame by frame basis inside the loop if you wanted to vary it by frame number or some other condition/criteria.

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