How to rotate and rescale a portion of a class images in an image datastore network ?

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Mohamed Elbeialy
Mohamed Elbeialy on 3 Apr 2020
Commented: Mohammad Sami on 3 Apr 2020
I have a network of 5 classes and looking to rotate and rescale a portion of images of specifc class , then train, test and validate the network

Answers (1)

Mohammad Sami
Mohammad Sami on 3 Apr 2020
You can use the augmentedImageDataStore. It will randomly apply the specified agumentation to the images.
https://www.mathworks.com/help/deeplearning/ref/augmentedimagedatastore.html
% From Example
imageAugmenter = imageDataAugmenter( ...
'RandRotation',[-20,20], ...
'RandXTranslation',[-3 3], ...
'RandYTranslation',[-3 3])
augimds = augmentedImageDatastore(imageSize,XTrain,YTrain,'DataAugmentation',imageAugmenter);
% or
augimds = augmentedImageDatastore(imageSize,imds,'DataAugmentation',imageAugmenter);
  1 Comment
Mohammad Sami
Mohammad Sami on 3 Apr 2020
You can combine multipe data stores using the combine function.
So create and augmenteddatastore with the images you want to rotate.
Create another datastore with rest of the images.
Then use the combine function to merge the two together.
Reference :

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