How to join or merge two Image Data Stores?

Question

kowshik Thopalli 2017-2-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/327026-how-to-join-or-merge-two-image-data-stores

编辑： Matt J 2022-6-28

采纳的回答： Zhiqiang Qiu

If I have two image datastores and I wish to concatenate them. How can I do that?

Thanks

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Sherin Aly 2018-1-13

编辑：Sherin Aly 2018-1-13

It was a bit tricky but I was able to merge 2 datastores as follows:

imds1 = imageDatastore(location of DS 1,'IncludeSubfolders',true,'LabelSource','foldernames');

imds2 = imageDatastore(imds2 location,'IncludeSubfolders',true,'LabelSource','foldernames');

% create a dummy dataset with the same size of the combined datastores (if ds1 has 100 images and ds2 has 100 images then dummy has 200 images. I made a folder with some photos with equal number of the 2 datastores)

dummy = imageDatastore('Dummy data store locaation','IncludeSubfolders',true,'LabelSource','foldernames');

% note: below this line you can use any datastore variable you want to merge including the ones you get after splitting training and testing

dummy.Files=[imds1.Files;imds2.Files];

dummy.Labels=[imds1.Labels;imds2.Labels];

% Now dummy is the new combined datastore and you can use all datastore functions

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Answer 1

Zhiqiang Qiu 2018-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/327026-how-to-join-or-merge-two-image-data-stores#answer_301257

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I know it is an ancient problem, but I just to make it a better reference for other people.

imds1 = imageDatastore('imds1 location', ...);
imds2 = imageDatastore('imds2 location', ...);
imds_combine = imageDatastore({'imds1 location', 'imds2 location'}, ...);

Just combine the address of these two locations. The following parameters are all the same.

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habtamu miheretie 2018-9-7

that is cool answer! i have very similar problem. when i create the data store the files are not in the same order as in the folder. how can i make that possible? i need it because the label i use is coming from another .csv file. so i need to match the order to process the images easily. can anyone help me on this please?

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Answer 2

Hana 2018-1-18

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https://ww2.mathworks.cn/matlabcentral/answers/327026-how-to-join-or-merge-two-image-data-stores#answer_300732

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I met the same problem and saw your post. Finally I find out a way:

imds = imageDatastore(cat(1,imds1.Files,imds2.Files))
imds.Labels = cat(1,imds1.Labels,imds2.Labels)

It works for me.

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Silvia Guatelli 2021-3-19

Excelente!!! Muchas gracias!

Joseph Garrett 2022-1-9

perfect. thank you so much!!

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Answer 3

berkan 2017-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/327026-how-to-join-or-merge-two-image-data-stores#answer_267982

allImages.Files=[test1.Files;test2.Files]; allImages.Labels=[test1.Labels;test2.Labels];

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Sascha D. Krauß 2017-7-3

Unfortunately, this produces a struct instead of a new datastore - and I could not find a way to convert it back. This means, that you cannot use the datastore specific functions like "countEachLabel" etc. Does anyone know another solution?

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Answer 4

KSSV 2017-2-27

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https://ww2.mathworks.cn/matlabcentral/answers/327026-how-to-join-or-merge-two-image-data-stores#answer_256419

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A = imread('ngc6543a.jpg');
B = imread('peppers.png');
%%resize the images so that they have same dimensions 
A_resize = imresize(A,[size(B,1) size(B,2)]) ;
%%join them
AB = [A_resize B] ;
imshow(AB) ;

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kowshik Thopalli 2017-2-27

编辑：kowshik Thopalli 2017-2-27

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Hi, Thanks for the answer, however I am looking to merge two

imageDatastore

objects .

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Answer 5

Aasim Khurshid 2020-12-30

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https://ww2.mathworks.cn/matlabcentral/answers/327026-how-to-join-or-merge-two-image-data-stores#answer_587758

编辑：Matt J 2022-6-28

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There is a better way to do this,

imds = imageDatastore({fullfile(imgFolder1Adress),fullfile(imgFolder2Adress),fullfile(imgFolder3Adress)},...
    'IncludeSubfolders',true,'FileExtensions','.png','LabelSource','foldernames');