Grey Scale -> RGB images from augmentedImageSource

Question

Samir Gouin 2020-11-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/636760-grey-scale-rgb-images-from-augmentedimagesource

评论： Samir Gouin 2020-11-16

Hi, I would like to convert grey scale images to [227 227 3]. I'm able to adjust the size using "auimds = augmentedImageSource(imageSize, trainingImages); " but I'm having trouble with converting to RGB (for use with Alex Net).

I've tried:

%grayimg=repmat(grayimg, 1, 1, 3);
%auimds = cat(3, auimds, auimds, auimds);
%auimds(:,:,[1 1 1]);
%RGB = auimds(3, auimds, auimds, auimds);

and the grey2rgb() method

Any suggestions?

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Aditya Patil 2020-11-16

Can you elaborate on the issue you are facing? Share any errors that were shown, and also share the output of the "version" command.

Samir Gouin 2020-11-16

Screen Shot 2020-11-16 at 8.38.22 AM.png

Version '9.8.0.1359463 (R2020a) Update 1'

Error is in the photo

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Answer 1

Subhadeep Koley 2020-11-16

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/636760-grey-scale-rgb-images-from-augmentedimagesource#answer_545933

在 MATLAB Online 中打开

You can use the ColorPreprocessing Name-Value pair of augmentedImageSource to achieve what you want.

imageSize = [227 227 3];
auimds = augmentedImageSource(imageSize, trainingImages, 'ColorPreprocessing', 'gray2rgb'); % 'trainingImages' is your image datastore

Also if your using MATLAB R2018a or above, you might want to use augmentedImageDatastore instead of the augmentedImageSource due to the Compatibility Considerations.

augmentedImageDatastore is a direct replacement of augmentedImageSource. Like below,

imageSize = [227 227 3];
auimds = augmentedImageDatastore(imageSize, trainingImages, 'ColorPreprocessing', 'gray2rgb'); % 'trainingImages' is your image datastore