features extraction for images with different features size in a matrix error?

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yasmin almashagbah 2020-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/669553-features-extraction-for-images-with-different-features-size-in-a-matrix-error

评论： yasmin almashagbah 2020-12-9

I am trying to extract features from a dataset of images the problem that the features extraction algorithm gives different features size for each image, for example, the first image 1000 features and the second 2000. and it gives me an error because of that when I try to store them in a matrix. what should I do??

imds=imageDatastore('E:\dataset test','IncludeSubFolders',true,'LabelSource','foldernames');
trainingFeatures=[];
[imds_5k, imds_extra] = splitEachLabel(imds,15);
trainingLabels=imds_5k.Labels;  
for i = 1:numel(imds_5k.Files)         % Read images using a for loop
 img = readimage(imds_5k,i);
   trainingFeatures(i,:) = example(img);
   
end

this is the error: Unable to perform assignment because the size of the left side is 1-by-86386 and the size of the right side is 1-by-73638.

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采纳的回答

Ameer Hamza 2020-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/669553-features-extraction-for-images-with-different-features-size-in-a-matrix-error#answer_560623

在 MATLAB Online 中打开

You can use a cell array

imds=imageDatastore('E:\dataset test','IncludeSubFolders',true,'LabelSource','foldernames');
[imds_5k, imds_extra] = splitEachLabel(imds,15);
trainingLabels=imds_5k.Labels;
trainingFeatures=cell(1,numel(imds_5k.Files));
for i = 1:numel(imds_5k.Files)         % Read images using a for loop
    img = readimage(imds_5k,i);
    trainingFeatures{i} = example(img);  
end