I have trained 80% of a data image, but want to Rotate and Crop only 10%. How to rotate and crop only the 10% and show cropped image

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Mohamed Elbeialy 2020-5-26

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https://ww2.mathworks.cn/matlabcentral/answers/534008-i-have-trained-80-of-a-data-image-but-want-to-rotate-and-crop-only-10-how-to-rotate-and-crop-onl

回答： Prateek Rai 2021-9-13

clear ;

clc;

imds = imageDatastore('D:\dataimage','IncludeSubfolders',true,'LabelSource','foldernames');

[imdsTrain,imdsValidation,imdsTest] = splitEachLabel(imds,0.8,0.1,0.1);

augimdsTrain = augmentedImageDatastore([227 227],imdsTrain);

augimdsValidation = augmentedImageDatastore([227 227],imdsValidation); % resize image

augimdsTest = augmentedImageDatastore([227 227],imdsTest);

g=ceil((t1.Count*10/100));

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Answer 1

Prateek Rai 2021-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/534008-i-have-trained-80-of-a-data-image-but-want-to-rotate-and-crop-only-10-how-to-rotate-and-crop-onl#answer_786569

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To my understanding, you have trained 80% of a data image, but want to Rotate and Crop only 10%.

For cropping,you can use ''OutputSizeMode' Name-value pair of 'augmentedImageDatastore' and set it to 'centercrop' or 'randcrop' as per your requirement.

augimdsValidation = augmentedImageDatastore([227 227],imdsValidation,'OutputSizeMode','centercrop');

For rotation, you can use 'imageDataAugmenter' in 'augmentedImageDatastore'. 'imageDataAugmenter' will use 'RandRotation' to set range of rotation.

% imageDataAugmenter use 'RandRotation' to set range of rotation.
augmenter = imageDataAugmenter('RandRotation',[0 360]);
% 'imageDataAugmenter' will passed to 'augmentedImageDatastore' as 'DataAugmentation' Name-Value pair 
augimdsValidation = augmentedImageDatastore([227 227],imdsValidation,'DataAugmentation',augmenter);

You can club both to get crop and rotation both:

augmenter = imageDataAugmenter('RandRotation',[0 360]);
augimdsValidation = augmentedImageDatastore([227 227],imdsValidation,'OutputSizeMode','centercrop','DataAugmentation',augmenter);

You can refer to augmentedImageDatastore MathWorks documentation page to find more on augmentedImageDatastore and imageDataAugmenter MathWorks documentation page to find more on imageDataAugmenter.