Question on imageDataStore syntax and parameters

Hi all, I face some problems with imageDataStore function. Can anyone please explain the syntax or parameter involved?

First example:

imds = imageDatastore(fullfile(matlabroot,'toolbox','matlab'),...
'IncludeSubfolders',true,'FileExtensions','.tif','LabelSource','foldernames')

What means by 'true', what's the effect of 'File Extensions' selected, and what's 'LabelSources' and 'foldernames' refer to?

Second example:

outputFolder = fullfile(tempdir, 'caltech101');
rootFolder = fullfile(outputFolder, '101_ObjectCategories');
categories = {'airplanes', 'ferry', 'laptop'};
imds = imageDatastore(fullfile(rootFolder, categories), 'LabelSource', 'foldernames');

Is there any relationships between 'LabelSources' and 'foldernames' with 'rootFolder' and 'categories'?

Thank you in advanced.

[Sarhan]

Hi Every body: ImageDatastore does not read all the subfolders in the root directory 'junk', it only reads the first subdirectory in 'junk' Using the statement

>> imdsx=imageDatastore(fullfile('C:\Users', 'sarhan', 'Desktop', 'junk'),'IncludeSubfolders' , 1, 'LabelSource','foldernames')

Any answers would be appreciated.

Answer 1

[Grzegorz Knor]

All 'Name-Value Pair' arguments are described in the documentation: https://uk.mathworks.com/help/matlab/ref/imagedatastore.html#namevaluepairarguments

For example: 'IncludeSubfolders' - Subfolder inclusion flag, specified as the comma-separated pair consisting of 'IncludeSubfolders' and true, false.

[Kingsley Chan]

Thank you! Didnt't see it just now, haha

[Rik]

The current link to the doc page is slightly different:

https://www.mathworks.com/help/matlab/ref/matlab.io.datastore.imagedatastore.html#namevaluepairarguments