Use files from multiple folders

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Nikoo Moradpour 2023-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/2002082-use-files-from-multiple-folders

评论： Nikoo Moradpour 2023-7-31

Hi

I want to extract images from different videos in different folders (other than the folder for MATLAB code) but I do not want to use a separate code saved in the same directory of each video. Also I want to save the extracted images in the same directory of the original video. Is that possible?

Thanks

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Answer 1

Image Analyst 2023-7-29

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https://ww2.mathworks.cn/matlabcentral/answers/2002082-use-files-from-multiple-folders#answer_1280547

Since this is one of the most common FAQs, see the FAQ for code snippets:

https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files?

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Answer 2

Jon 2023-7-28

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在 MATLAB Online 中打开

Yes, this is possible.

You can either open the file using the full path to the file, for example

im = imread('c:/mystuff/myvideos/image001.jpg');

or you can change the directory down to the directory where the files are, do what you want and then go back

% Save the original folder so you can go back and navigate to new folder
oldFolder = cd('c:/mystuff/myvideos');
% Read the image, etc
im = imread('image001.jpg');
% Go back to original directory
cd(oldFolder)

You can also use relative paths. See https://www.mathworks.com/help/matlab/ref/cd.html for more details.

You can also look at the dir command that is useful to find the names of available files and folders, see https://www.mathworks.com/help/matlab/ref/dir.html

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Stephen23 2023-7-29

编辑：Stephen23 2023-7-29

Using CD in code should be avoided, as it forces MATLAB to rescan those folders for all relevant files and can changes what functions get called. The documentation recommends "Avoid programmatic use of cd, addpath, and rmpath, when possible. Changing the MATLAB path during run time results in code recompilation."

source: https://www.mathworks.com/help/matlab/matlab_prog/techniques-for-improving-performance.html#buwj1nn

Using absolute / relative filenames is faster, easier to debug, and more robust.

Nikoo Moradpour 2023-7-31