i want to save names of the images(frame_0000, frame_0001, frame_0003........) in a text file by reading them from a folder.

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sidra Rafique
sidra Rafique 2018-8-14
评论： sidra Rafique 2018-8-15
i want to save names of the images(frame_0000, frame_0001, frame_0003........) in a text file by reading them from a folder. somehow i am getting errors while writing the code. As i am new to MatLab please help me. Waiting for your response.

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Stephen23
Stephen23 2018-8-14
编辑：Stephen23 2018-8-14
D = 'directory where images are';
S = dir(fullfile(D,'*.jpg'));
% Save filenames:
[fid,msg] = fopen('names.txt','wt');
assert(fid>=3,msg)
fprintf(fid,'ImageName\n')
fprintf(fid,'%s\n',S.name)
fclose(fid);
% Load files:
for k = 1:numel(S)
Im = imread(fullfile(D,S(k).name));
...
end
This uses S.name to generate a comma-separated list, and so each filename gets printed to the textfile.
See also: https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists
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Stephen23
Stephen23 2018-8-15
编辑：Stephen23 2018-8-15
@sidra Rafique: your code duplicates printing the filenames, and you need to add a separator/delimiter character between the filename and the value. Try something like this:
c = {S.name};
c(2,:) = num2cell(d);
[fid,msg] = fopen('names.txt','wt');
assert(fid>=3,msg);
fprintf(fid, '%s,%s\n','Imagename','Diameter');
fprintf(fid, '%s,%3.4f\n',c{:});
fclose(fid);
Note how I used the comma as a delimiter, and the filenames are included in c, so you do not need to print them again.
sidra Rafique
sidra Rafique 2018-8-15
still its not working. but i have used xlswrite() to save in excel instead of text document. and its working and its more simpler. Thanks for your help.

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更多回答（1 个）

Yuvaraj Venkataswamy
Check below link. https://in.mathworks.com/matlabcentral/answers/333532-how-to-extract-and-save-frames-in-a-video
In your case you can use below command.
if true
imwrite(frames, fullfile(f_folder,sprintf ('%frame_04d.jpg', nFrame)));
end
  1 个评论
sidra Rafique
sidra Rafique 2018-8-14
编辑：Stephen23 2018-8-14
i am done with reading all the 1000 images(frame_0000, frame_0001, frame_0003...., frame_1000) from a folder using below code:
Directory= //path where images are located
Imgs = dir(fullfile(Directory,'*.jpg'));
for j=1:length(Imgs)
Img = imread(fullfile(Directory,Imgs(j).name)); % Read image
end
but now i am still unable to make a text file consisting of names of all the read images with same name format in column.i.e;
ImageName
frame_0000
frame_0001
.
.
.
for that i am using below code:
fid = fopen('names.txt','w');
fprintf(fid, '%5s\n','Imagename');
fprintf(fid, '%i\n',j);
fclose(fid);
but its only showing last read image if i do %i but with %s its showing nothing.. please help me in finding solution.

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