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How can i make feature extraction using PCA using matlab code on galaxy image ?

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Please help me ..
i want to make feature extraction using PCA ,using matlab code on galaxy image like that >>
I was wondering if anyone could help me with a few steps or even code to make feature extraction from images .
I would like to extract the features of galaxy images and then classify them in the classification learner app.
The data I have is a set of galaxy imagse.
The aim is to extract the features and then compare them in the classification app with each other.
Any help is appreciated!
i want to know how pca work ? does it work in gray images only ??
Thanks ..
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