ImageDatastore from text file

Try this code snippet. The below code will read images, whose locations are specified in the testingdata.txt file and will also label them according to their foldernames.

% Read the filenames and put them in cell array
fId = fopen('testingdata.txt');
tline = fgetl(fId);
tlines = cell(0, 1);
while ischar(tline)
    tlines{end+1, 1} = (tline);
    tline = fgetl(fId);
end
% Create an imageDatastore object
imds = imageDatastore(tlines, 'LabelSource', 'foldernames');

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Lin 2020-11-10

thank you very much for your answer.

How about if the directory in the text file list is not uniform such as follows:

testingdata.txt:

/DataSet/label1/imageA/1.jpg

/DataSet/label1/imageB/imageA1/1.jpg

/DataSet/label1/imageC/A/3.jpg

/DataSet/label1/imageD/a/1.jpg

/DataSet/label2/imageA1/1a/2.jpg

/DataSet/label2/imageB/a/2a.jpg

/DataSet/label2/imageC/C1/1c.jpg

/DataSet/label2/imageA/1a/4.jpg

Subhadeep Koley 2020-11-10

编辑：Subhadeep Koley 2020-11-10

在 MATLAB Online 中打开

@LS This can be achieved with a bit more processing. There are a lot of ways to achieve this. The below code might help you.

% Read the filenames and put them in cell array
fId = fopen('testingdata.txt');
tline = fgetl(fId);
tlines = cell(0, 1);
while ischar(tline)
    tlines{end+1, 1} = tline;
    tline = fgetl(fId);
end
% Create an imageDatastore object
imds = imageDatastore(tlines);
% Modify image labels of the imageDatastore object
expression = 'label[\d]';
funHandle = @(str)regexpi(str, expression, 'match');
customLabels = cellfun(funHandle, squeeze(imds.Files));
imds.Labels = categorical(customLabels);