How to skip file in imageDatastore.ReadFcn?

Question

tesarj13 2021-1-24

0
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https://ww2.mathworks.cn/matlabcentral/answers/725747-how-to-skip-file-in-imagedatastore-readfcn

编辑： John 2022-11-18

I have folder with dicom files (.dcm). Some of them are images (with size MxNx3), some of them are videos (MxNx3xnumOfFrames). I would like to use imageDatastore to read images only.

I tried this:

imds = imageDatastore('pathToDicoms','FileExtensions',{'.dcm'},'ReadFcn',@ImageLoader);
function imgOut = ImageLoader(path)
    imgOut = dicomread(path);
    if(length(size(imgOut))>3)
        imgOut = [];
    end
end

But it return empty matrix insead of ommiting the file.

How to skip file in read fuction?

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John 2022-11-18

编辑：John 2022-11-18

在 MATLAB Online 中打开

I used this and worked well:

exts = ".dcm";
readimgFcn = @(x)int16(dicomread(x));
imds = imageDatastore(datafiles,FileExtensions=exts,ReadFcn=readimgFcn);

Hope this helps.

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Answer 1

Jeremy Hughes 2021-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/725747-how-to-skip-file-in-imagedatastore-readfcn#answer_605958

The only way to do this is to remove the files from the Files list on the ImageDatastore, or make a copy of this dataset which contains only the images, and not the videos.

If there's any way to tell what the contents are from the file name, or file metadata using dicominfo(filename), you might have an easier time splitting them out.