how to read labels of image dataset from mat files

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Suheer Ali 2018-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/426619-how-to-read-labels-of-image-dataset-from-mat-files

评论： Suheer Ali 2018-10-29

I have a dataset which contains two folders one for images and another one is the truth_ground which has mat files that has the information about images (number of heads per image) I want to read this dataset so I can get the images with their labels.

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Answer 1

Image Analyst 2018-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/426619-how-to-read-labels-of-image-dataset-from-mat-files#answer_343894

在 MATLAB Online 中打开

Try this

folder = 'c:\whatever\truth_ground';
fullFileName = fullfile(folder, 'someName.mat')
s = load(fullFileName);

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Suheer Ali 2018-10-28

编辑：Suheer Ali 2018-10-29

在 MATLAB Online 中打开

thanks for you replay I did this code but it gives me error when I add the data to array of labeling.

if true
   path ='C:\Users\Suhair\Documents\Network\crowd-counting-scnn-master\dataset\ShanghaiTech\part_A\train_data\ground-truth\';
for i=1:300
    p=strcat(path , strcat(strcat('GT_IMG_',int2str(i)),'.mat'));
    s=load(p);
    label=s.image_info{1, 1}.number;
    categories{i} = label ;
end 
%categories=mat2cell(categories)
%rootFolder = 'C:\Users\Suhair\Documents\Network\crowd-counting-scnn-master\dataset\ShanghaiTech\part_A\train_data\images';
path2 ='C:\Users\Suhair\Documents\Network\crowd-counting-scnn-master\dataset\ShanghaiTech\part_A\train_data\images\';
img=load(strcat(path2,'IMG_1.jpg'));
% this line to check that the path is exist.
done='done'
imds = imageDatastore(fullfile(path2, categories), ...
    'LabelSource', 'foldernames');
countEachLabel(imds)
imds.ReadSize = numpartitions(imds);
end 
  end

I get the following error

Error using imageDatastore (line 116) Cannot find files or folders matching: 'C:\Users\Suhair\Documents\Network\crowd-counting-scnn-master\dataset\ShanghaiTech\part_A\train_data\images\؊'.

Error in deepLearning (line 20) imds = imageDatastore(fullfile(path2, categories), ...

now I am sure that the path is correct but it add ؊ at the end of path and I don't know why.

Image Analyst 2018-10-28

Never, ever, EVER overwrite the built in path variable with a variable of your own with the same name. Notice I did not do that. I used folder instead.

You can also use sprintf() - it's simpler than that strcat stuff.

Attach your .mat file if you want more help.

Suheer Ali 2018-10-29

hi thanks for your replay I used a dataset in this lisnk

https://github.com/desenzhou/ShanghaiTechDataset

my problem is now with imageDatasore function.

thanks

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how to read labels of image dataset from mat files

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