How to read several files and save CSV files in folder

Question

Kong 2020-3-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/510559-how-to-read-several-files-and-save-csv-files-in-folder

评论： Kong 2020-3-12

采纳的回答： Jon

在 MATLAB Online 中打开

Hello. I am a beginner in Matlab.

I have several video files (daria_bend.avi, denis_bend.avi, eli_bend.avi, .......).

I want to read each file and save it to the CSV file.

I have a code, but I want to use "for loop" to read without entering each name of the file.

How to fix two parts.

reader = VideoReader('shahar_bend.avi');
csvwrite('shahar_bend_file.csv',X);

All code / I should enter each file name.

clear all
close all
%// read the video:
reader = VideoReader('shahar_bend.avi');
vid = {};
while hasFrame(reader)
    vid{end+1} = im2single(readFrame(reader));
end
%// simple background estimation using mean:
bg = mean( cat(4, vid{:}), 4);
%// estimate foreground as deviation from estimated background:
for i=1:30
    fIdx(i) = i; %// do it for frame 1 ~ 60
    fg{i} = sum( abs( vid{fIdx(i)} - bg ), 3 );
    fg{i} = imresize(fg{i}, 0.5);
    fg{i} = reshape(fg{i},[],1);
end
X = cell2mat(fg);
csvwrite('shahar_bend_file.csv',X);

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Answer 1

Jon 2020-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/510559-how-to-read-several-files-and-save-csv-files-in-folder#answer_419871

编辑：Jon 2020-3-12

在 MATLAB Online 中打开

You can use

list = dir('*.avi')

to get a list of the .avi files in your local director. Check out the documentation on the dir command for details.

It return an array of structures. Specifically you can make a loop like

% get a list of the .avi files
list = dir('*.avi')
% loop through the filenames in the list
for k = 1:length(list)
    reader = VideoReader(list.name(k));
    % and so on
    
end