Imagedatastore can not find files

Hi,

I keep getting the following errors when I run this code.

"Error using imageDatastore (line 138)

Cannot find files or folders matching: 'photos\x'."

I was trying to use ANN to be able to tell different categories. However, for some reason matlab is not reading my images. I tried different methods such as dividing the code down to multiple imds such as

% imds1 = imageDatastore('C:\Users\OneDrive\Desktop\photos\x', 'FileExtensions',{'.HEIC'})
% imds2 = imageDatastore('C:\Users\OneDrive\Desktop\photos\y','FileExtensions',{'.HEIC'})
% imds3 = imageDatastore('C:\Users\OneDrive\Desktop\photos\z','FileExtensions',{'.HEIC'})
% imds4 = imageDatastore('C:\Users\OneDrive\Desktop\photos\a','FileExtensions',{'.HEIC'})
% imds5 = imageDatastore('C:\Users\OneDrive\Desktop\photos\b','FileExtensions',{'.HEIC'})

which was able to read the photos but was not able to determine which category it belonged to.

The code is:

categories = {'x','y','z','a','b'};
rootFolder = 'photos';
imds = imageDatastore (fullfile(rootFolder, categories), ...
     'LabelSource',"foldernames", 'IncludeSubfolders',true);

Please Help, Thank you in advance!

Answer 1

[Image Analyst]

Did you look at what the fullfile() returns? Let's pull it out separately and see

categories = {'x','y','z','a','b'};
rootFolder = 'photos';
filePattern = fullfile(rootFolder, categories)
imds = imageDatastore(filePattern, ...
	'LabelSource',"foldernames", 'IncludeSubfolders',true);

We see

ans =

1×5 cell array

{'photos\x'} {'photos\y'} {'photos\z'} {'photos\a'} {'photos\b'}

so as you can see, those are not full folder names with drive and everything, so it's not able to find the files.

[Marina Ghobrial]

Hi, so you are saying I should create 5 seperate folders rather than 5 subfolders? To make them full folders?

[Image Analyst]

No, not at all. If you get the full name of your folder it will be something like

'C:\Users\OneDrive\Desktop\photos\x

it will NOT be just the last two subfolders like

photos\x

However, that is exactly what you're passing to imageDatastore(). And of course it doesn't like it. So try the full path of the folder, meaning that it contains the drive and upper level folders, like

categories = {'x','y','z','a','b'};
rootFolder = 'C:\Users\OneDrive\Desktop\photos'; % Contains full path
filePattern = fullfile(rootFolder, categories)
imds = imageDatastore(filePattern, ...
	'LabelSource',"foldernames", 'IncludeSubfolders',true);

[Marina Ghobrial]

yes, it worked. Thank you so much for all your help!

[Image Analyst]

You're welcome. Glad it worked. Could you please click the "Accept this answer" link?