DataStore, change labels in R2020a

Question

James Latshaw 2021-12-13

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1609985-datastore-change-labels-in-r2020a

编辑： Yongwon Jang 2023-7-20

Hello,

Is there a way to change all labels in an imageDataStore to an appended version of the current label?

I have my images saved in folders with the folder name being the label. Once I load these into an ImageDataStore, I would like to split them into two smaller datastores and then I would like to change each label to be "current label" + "_A".

In psudo code:

For every label in data store 1, rename to be label + "_A".

For every label in data store 2, rename to be label + "_B".

Is this possible?

Thank you!

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Answer 1

yanqi liu 2021-12-14

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1609985-datastore-change-labels-in-r2020a#answer_854720

在 MATLAB Online 中打开

yes，sir，may be use subset and string contract to generate，such as

imds = imageDatastore(fullfile(matlabroot,'toolbox','matlab'),...

'IncludeSubfolders',true,'FileExtensions','.tif','LabelSource','foldernames')

imds =

ImageDatastore with properties: Files: { '/MATLAB/toolbox/matlab/demos/example.tif'; '/MATLAB/toolbox/matlab/imagesci/corn.tif' } Folders: { '/MATLAB/toolbox/matlab' } Labels: [demos; imagesci] AlternateFileSystemRoots: {} ReadSize: 1 SupportedOutputFormats: ["png" "jpg" "jpeg" "tif" "tiff"] DefaultOutputFormat: "png" ReadFcn: @readDatastoreImage

imds.Labels=categorical(erase(string(imds.Labels), ' ') + repmat('_A', size(imds.Labels, 1), 1))

imds =

ImageDatastore with properties: Files: { '/MATLAB/toolbox/matlab/demos/example.tif'; '/MATLAB/toolbox/matlab/imagesci/corn.tif' } Folders: { '/MATLAB/toolbox/matlab' } Labels: [demos_A; imagesci_A] AlternateFileSystemRoots: {} ReadSize: 1 SupportedOutputFormats: ["png" "jpg" "jpeg" "tif" "tiff"] DefaultOutputFormat: "png" ReadFcn: @readDatastoreImage

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Paween Pongsomboon 2022-4-1

@yanqi liu You save my life. Thank you. I'm gonna cry I have been struggled with this problem for three days and now you don't know how much I wanna hug you.

Yongwon Jang 2023-7-20